Merge remote-tracking branch 'rpmsg/for-next'

24 files changed, 1256 insertions, 208 deletions

diff --git a/Documentation/ABI/testing/sysfs-class-remoteproc b/Documentation/ABI/testing/sysfs-class-remoteproc
new file mode 100644
index 000000000000..d188afebc8ba
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-class-remoteproc
@@ -0,0 +1,50 @@
+What:		/sys/class/remoteproc/.../firmware
+Date:		October 2016
+Contact:	Matt Redfearn <matt.redfearn@imgtec.com>
+Description:	Remote processor firmware
+
+		Reports the name of the firmware currently loaded to the
+		remote processor.
+
+		To change the running firmware, ensure the remote processor is
+		stopped (using /sys/class/remoteproc/.../state) and write a new filename.
+
+What:		/sys/class/remoteproc/.../state
+Date:		October 2016
+Contact:	Matt Redfearn <matt.redfearn@imgtec.com>
+Description:	Remote processor state
+
+		Reports the state of the remote processor, which will be one of:
+
+		"offline"
+		"suspended"
+		"running"
+		"crashed"
+		"invalid"
+
+		"offline" means the remote processor is powered off.
+
+		"suspended" means that the remote processor is suspended and
+		must be woken to receive messages.
+
+		"running" is the normal state of an available remote processor
+
+		"crashed" indicates that a problem/crash has been detected on
+		the remote processor.
+
+		"invalid" is returned if the remote processor is in an
+		unknown state.
+
+		Writing this file controls the state of the remote processor.
+		The following states can be written:
+
+		"start"
+		"stop"
+
+		Writing "start" will attempt to start the processor running the
+		firmware indicated by, or written to,
+		/sys/class/remoteproc/.../firmware. The remote processor should
+		transition to "running" state.
+
+		Writing "stop" will attempt to halt the remote processor and
+		return it to the "offline" state.
diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,adsp.txt b/Documentation/devicetree/bindings/remoteproc/qcom,adsp.txt
new file mode 100644
index 000000000000..b85885a298d8
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/qcom,adsp.txt
@@ -0,0 +1,98 @@
+Qualcomm ADSP Peripheral Image Loader
+
+This document defines the binding for a component that loads and boots firmware
+on the Qualcomm ADSP Hexagon core.
+
+- compatible:
+	Usage: required
+	Value type: <string>
+	Definition: must be one of:
+		    "qcom,msm8974-adsp-pil"
+		    "qcom,msm8996-adsp-pil"
+
+- interrupts-extended:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: must list the watchdog, fatal IRQs ready, handover and
+		    stop-ack IRQs
+
+- interrupt-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: must be "wdog", "fatal", "ready", "handover", "stop-ack"
+
+- clocks:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: reference to the xo clock to be held on behalf of the
+		    booting Hexagon core
+
+- clock-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: must be "xo"
+
+- cx-supply:
+	Usage: required
+	Value type: <phandle>
+	Definition: reference to the regulator to be held on behalf of the
+		    booting Hexagon core
+
+- memory-region:
+	Usage: required
+	Value type: <phandle>
+	Definition: reference to the reserved-memory for the ADSP
+
+- qcom,smem-states:
+	Usage: required
+	Value type: <phandle>
+	Definition: reference to the smem state for requesting the ADSP to
+		    shut down
+
+- qcom,smem-state-names:
+	Usage: required
+	Value type: <stringlist>
+	Definition: must be "stop"
+
+
+= SUBNODES
+The adsp node may have an subnode named "smd-edge" that describes the SMD edge,
+channels and devices related to the ADSP.  See ../soc/qcom/qcom,smd.txt for
+details on how to describe the SMD edge.
+
+
+= EXAMPLE
+The following example describes the resources needed to boot control the
+ADSP, as it is found on MSM8974 boards.
+
+	adsp {
+		compatible = "qcom,msm8974-adsp-pil";
+
+		interrupts-extended = <&intc 0 162 IRQ_TYPE_EDGE_RISING>,
+				      <&adsp_smp2p_in 0 IRQ_TYPE_EDGE_RISING>,
+				      <&adsp_smp2p_in 1 IRQ_TYPE_EDGE_RISING>,
+				      <&adsp_smp2p_in 2 IRQ_TYPE_EDGE_RISING>,
+				      <&adsp_smp2p_in 3 IRQ_TYPE_EDGE_RISING>;
+		interrupt-names = "wdog",
+				  "fatal",
+				  "ready",
+				  "handover",
+				  "stop-ack";
+
+		clocks = <&rpmcc RPM_CXO_CLK>;
+		clock-names = "xo";
+
+		cx-supply = <&pm8841_s2>;
+
+		memory-region = <&adsp_region>;
+
+		qcom,smem-states = <&adsp_smp2p_out 0>;
+		qcom,smem-state-names = "stop";
+
+		smd-edge {
+			interrupts = <0 156 IRQ_TYPE_EDGE_RISING>;
+
+			qcom,ipc = <&apcs 8 8>;
+			qcom,smd-edge = <1>;
+		};
+	};
diff --git a/Documentation/devicetree/bindings/remoteproc/qcom,wcnss-pil.txt b/Documentation/devicetree/bindings/remoteproc/qcom,wcnss-pil.txt
index 0d2361ebe3d7..d420f84ddfb0 100644
--- a/Documentation/devicetree/bindings/remoteproc/qcom,wcnss-pil.txt
+++ b/Documentation/devicetree/bindings/remoteproc/qcom,wcnss-pil.txt
@@ -60,8 +60,8 @@ on the Qualcomm WCNSS core.
 		    see ../reserved-memory/reserved-memory.txt
 
 = SUBNODES
-A single subnode of the WCNSS PIL describes the attached rf module and its
-resource dependencies.
+A required subnode of the WCNSS PIL is used to describe the attached rf module
+and its resource dependencies. It is described by the following properties:
 
 - compatible:
 	Usage: required
@@ -90,6 +90,11 @@ resource dependencies.
 	Definition: reference to the regulators to be held on behalf of the
 		    booting of the WCNSS core
 
+
+The wcnss node can also have an subnode named "smd-edge" that describes the SMD
+edge, channels and devices related to the WCNSS.
+See ../soc/qcom/qcom,smd.txt for details on how to describe the SMD edge.
+
 = EXAMPLE
 The following example describes the resources needed to boot control the WCNSS,
 with attached WCN3680, as it is commonly found on MSM8974 boards.
@@ -129,4 +134,25 @@ pronto@fb204000 {
 		vddpa-supply = <&pm8941_l19>;
 		vdddig-supply = <&pm8941_s3>;
 	};
+
+	smd-edge {
+		interrupts = <0 142 1>;
+
+		qcom,ipc = <&apcs 8 17>;
+		qcom,smd-edge = <6>;
+		qcom,remote-pid = <4>;
+
+		label = "pronto";
+
+		wcnss {
+			compatible = "qcom,wcnss";
+			qcom,smd-channels = "WCNSS_CTRL";
+
+			qcom,mmio = <&pronto>;
+
+			bt {
+				compatible = "qcom,wcnss-bt";
+			};
+		};
+	};
 };
diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt
index 97d9b3e1bf39..ea1dc75ec9ea 100644
--- a/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt
+++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt
@@ -43,6 +43,13 @@ The edge is described by the following properties:
 	Definition: the identifier for the remote processor as known by the rest
 		    of the system.
 
+- label:
+	Usage: optional
+	Value type: <string>
+	Definition: name of the edge, used for debugging and identification
+		    purposes. The node name will be used if this is not
+		    present.
+
 = SMD DEVICES
 
 In turn, subnodes of the "edges" represent devices tied to SMD channels on that
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 14d5d2d43a38..51d7ca0e10fc 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -78,6 +78,17 @@ config DA8XX_REMOTEPROC
 	  It's safe to say n here if you're not interested in multimedia
 	  offloading.
 
+config QCOM_ADSP_PIL
+	tristate "Qualcomm ADSP Peripheral Image Loader"
+	depends on OF && ARCH_QCOM
+	depends on REMOTEPROC
+	depends on QCOM_SMEM
+	select MFD_SYSCON
+	select QCOM_MDT_LOADER
+	help
+	  Say y here to support the TrustZone based Peripherial Image Loader
+	  for the Qualcomm ADSP remote processors.
+
 config QCOM_MDT_LOADER
 	tristate
 
@@ -92,18 +103,14 @@ config QCOM_Q6V5_PIL
 	  Say y here to support the Qualcomm Peripherial Image Loader for the
 	  Hexagon V5 based remote processors.
 
-config QCOM_WCNSS_IRIS
-	tristate
-	depends on OF && ARCH_QCOM
-
 config QCOM_WCNSS_PIL
 	tristate "Qualcomm WCNSS Peripheral Image Loader"
 	depends on OF && ARCH_QCOM
+	depends on QCOM_SMD || (COMPILE_TEST && QCOM_SMD=n)
 	depends on QCOM_SMEM
 	depends on REMOTEPROC
 	select QCOM_MDT_LOADER
 	select QCOM_SCM
-	select QCOM_WCNSS_IRIS
 	help
 	  Say y here to support the Peripheral Image Loader for the Qualcomm
 	  Wireless Connectivity Subsystem.
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 924f0cb25470..6290c3f72e83 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -5,15 +5,18 @@
 obj-$(CONFIG_REMOTEPROC)		+= remoteproc.o
 remoteproc-y				:= remoteproc_core.o
 remoteproc-y				+= remoteproc_debugfs.o
+remoteproc-y				+= remoteproc_sysfs.o
 remoteproc-y				+= remoteproc_virtio.o
 remoteproc-y				+= remoteproc_elf_loader.o
 obj-$(CONFIG_OMAP_REMOTEPROC)		+= omap_remoteproc.o
 obj-$(CONFIG_STE_MODEM_RPROC)	 	+= ste_modem_rproc.o
 obj-$(CONFIG_WKUP_M3_RPROC)		+= wkup_m3_rproc.o
 obj-$(CONFIG_DA8XX_REMOTEPROC)		+= da8xx_remoteproc.o
+obj-$(CONFIG_QCOM_ADSP_PIL)		+= qcom_adsp_pil.o
 obj-$(CONFIG_QCOM_MDT_LOADER)		+= qcom_mdt_loader.o
 obj-$(CONFIG_QCOM_Q6V5_PIL)		+= qcom_q6v5_pil.o
-obj-$(CONFIG_QCOM_WCNSS_IRIS)		+= qcom_wcnss_iris.o
-obj-$(CONFIG_QCOM_WCNSS_PIL)		+= qcom_wcnss.o
+obj-$(CONFIG_QCOM_WCNSS_PIL)		+= qcom_wcnss_pil.o
+qcom_wcnss_pil-y			+= qcom_wcnss.o
+qcom_wcnss_pil-y			+= qcom_wcnss_iris.o
 obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
 obj-$(CONFIG_ST_SLIM_REMOTEPROC)	+= st_slim_rproc.o
diff --git a/drivers/remoteproc/qcom_adsp_pil.c b/drivers/remoteproc/qcom_adsp_pil.c
new file mode 100644
index 000000000000..43a4ed2f346c
--- /dev/null
+++ b/drivers/remoteproc/qcom_adsp_pil.c
@@ -0,0 +1,428 @@
+/*
+ * Qualcomm ADSP Peripheral Image Loader for MSM8974 and MSM8996
+ *
+ * Copyright (C) 2016 Linaro Ltd
+ * Copyright (C) 2014 Sony Mobile Communications AB
+ * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/firmware.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/qcom_scm.h>
+#include <linux/regulator/consumer.h>
+#include <linux/remoteproc.h>
+#include <linux/soc/qcom/smem.h>
+#include <linux/soc/qcom/smem_state.h>
+
+#include "qcom_mdt_loader.h"
+#include "remoteproc_internal.h"
+
+#define ADSP_CRASH_REASON_SMEM		423
+#define ADSP_FIRMWARE_NAME		"adsp.mdt"
+#define ADSP_PAS_ID			1
+
+struct qcom_adsp {
+	struct device *dev;
+	struct rproc *rproc;
+
+	int wdog_irq;
+	int fatal_irq;
+	int ready_irq;
+	int handover_irq;
+	int stop_ack_irq;
+
+	struct qcom_smem_state *state;
+	unsigned stop_bit;
+
+	struct clk *xo;
+
+	struct regulator *cx_supply;
+
+	struct completion start_done;
+	struct completion stop_done;
+
+	phys_addr_t mem_phys;
+	phys_addr_t mem_reloc;
+	void *mem_region;
+	size_t mem_size;
+};
+
+static int adsp_load(struct rproc *rproc, const struct firmware *fw)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+	phys_addr_t fw_addr;
+	size_t fw_size;
+	bool relocate;
+	int ret;
+
+	ret = qcom_scm_pas_init_image(ADSP_PAS_ID, fw->data, fw->size);
+	if (ret) {
+		dev_err(&rproc->dev, "invalid firmware metadata\n");
+		return ret;
+	}
+
+	ret = qcom_mdt_parse(fw, &fw_addr, &fw_size, &relocate);
+	if (ret) {
+		dev_err(&rproc->dev, "failed to parse mdt header\n");
+		return ret;
+	}
+
+	if (relocate) {
+		adsp->mem_reloc = fw_addr;
+
+		ret = qcom_scm_pas_mem_setup(ADSP_PAS_ID, adsp->mem_phys, fw_size);
+		if (ret) {
+			dev_err(&rproc->dev, "unable to setup memory for image\n");
+			return ret;
+		}
+	}
+
+	return qcom_mdt_load(rproc, fw, rproc->firmware);
+}
+
+static const struct rproc_fw_ops adsp_fw_ops = {
+	.find_rsc_table = qcom_mdt_find_rsc_table,
+	.load = adsp_load,
+};
+
+static int adsp_start(struct rproc *rproc)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+	int ret;
+
+	ret = clk_prepare_enable(adsp->xo);
+	if (ret)
+		return ret;
+
+	ret = regulator_enable(adsp->cx_supply);
+	if (ret)
+		goto disable_clocks;
+
+	ret = qcom_scm_pas_auth_and_reset(ADSP_PAS_ID);
+	if (ret) {
+		dev_err(adsp->dev,
+			"failed to authenticate image and release reset\n");
+		goto disable_regulators;
+	}
+
+	ret = wait_for_completion_timeout(&adsp->start_done,
+					  msecs_to_jiffies(5000));
+	if (!ret) {
+		dev_err(adsp->dev, "start timed out\n");
+		qcom_scm_pas_shutdown(ADSP_PAS_ID);
+		ret = -ETIMEDOUT;
+		goto disable_regulators;
+	}
+
+	ret = 0;
+
+disable_regulators:
+	regulator_disable(adsp->cx_supply);
+disable_clocks:
+	clk_disable_unprepare(adsp->xo);
+
+	return ret;
+}
+
+static int adsp_stop(struct rproc *rproc)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+	int ret;
+
+	qcom_smem_state_update_bits(adsp->state,
+				    BIT(adsp->stop_bit),
+				    BIT(adsp->stop_bit));
+
+	ret = wait_for_completion_timeout(&adsp->stop_done,
+					  msecs_to_jiffies(5000));
+	if (ret == 0)
+		dev_err(adsp->dev, "timed out on wait\n");
+
+	qcom_smem_state_update_bits(adsp->state,
+				    BIT(adsp->stop_bit),
+				    0);
+
+	ret = qcom_scm_pas_shutdown(ADSP_PAS_ID);
+	if (ret)
+		dev_err(adsp->dev, "failed to shutdown: %d\n", ret);
+
+	return ret;
+}
+
+static void *adsp_da_to_va(struct rproc *rproc, u64 da, int len)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+	int offset;
+
+	offset = da - adsp->mem_reloc;
+	if (offset < 0 || offset + len > adsp->mem_size)
+		return NULL;
+
+	return adsp->mem_region + offset;
+}
+
+static const struct rproc_ops adsp_ops = {
+	.start = adsp_start,
+	.stop = adsp_stop,
+	.da_to_va = adsp_da_to_va,
+};
+
+static irqreturn_t adsp_wdog_interrupt(int irq, void *dev)
+{
+	struct qcom_adsp *adsp = dev;
+
+	rproc_report_crash(adsp->rproc, RPROC_WATCHDOG);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t adsp_fatal_interrupt(int irq, void *dev)
+{
+	struct qcom_adsp *adsp = dev;
+	size_t len;
+	char *msg;
+
+	msg = qcom_smem_get(QCOM_SMEM_HOST_ANY, ADSP_CRASH_REASON_SMEM, &len);
+	if (!IS_ERR(msg) && len > 0 && msg[0])
+		dev_err(adsp->dev, "fatal error received: %s\n", msg);
+
+	rproc_report_crash(adsp->rproc, RPROC_FATAL_ERROR);
+
+	if (!IS_ERR(msg))
+		msg[0] = '\0';
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t adsp_ready_interrupt(int irq, void *dev)
+{
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t adsp_handover_interrupt(int irq, void *dev)
+{
+	struct qcom_adsp *adsp = dev;
+
+	complete(&adsp->start_done);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t adsp_stop_ack_interrupt(int irq, void *dev)
+{
+	struct qcom_adsp *adsp = dev;
+
+	complete(&adsp->stop_done);
+
+	return IRQ_HANDLED;
+}
+
+static int adsp_init_clock(struct qcom_adsp *adsp)
+{
+	int ret;
+
+	adsp->xo = devm_clk_get(adsp->dev, "xo");
+	if (IS_ERR(adsp->xo)) {
+		ret = PTR_ERR(adsp->xo);
+		if (ret != -EPROBE_DEFER)
+			dev_err(adsp->dev, "failed to get xo clock");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int adsp_init_regulator(struct qcom_adsp *adsp)
+{
+	adsp->cx_supply = devm_regulator_get(adsp->dev, "cx");
+	if (IS_ERR(adsp->cx_supply))
+		return PTR_ERR(adsp->cx_supply);
+
+	regulator_set_load(adsp->cx_supply, 100000);
+
+	return 0;
+}
+
+static int adsp_request_irq(struct qcom_adsp *adsp,
+			     struct platform_device *pdev,
+			     const char *name,
+			     irq_handler_t thread_fn)
+{
+	int ret;
+
+	ret = platform_get_irq_byname(pdev, name);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "no %s IRQ defined\n", name);
+		return ret;
+	}
+
+	ret = devm_request_threaded_irq(&pdev->dev, ret,
+					NULL, thread_fn,
+					IRQF_ONESHOT,
+					"adsp", adsp);
+	if (ret)
+		dev_err(&pdev->dev, "request %s IRQ failed\n", name);
+
+	return ret;
+}
+
+static int adsp_alloc_memory_region(struct qcom_adsp *adsp)
+{
+	struct device_node *node;
+	struct resource r;
+	int ret;
+
+	node = of_parse_phandle(adsp->dev->of_node, "memory-region", 0);
+	if (!node) {
+		dev_err(adsp->dev, "no memory-region specified\n");
+		return -EINVAL;
+	}
+
+	ret = of_address_to_resource(node, 0, &r);
+	if (ret)
+		return ret;
+
+	adsp->mem_phys = adsp->mem_reloc = r.start;
+	adsp->mem_size = resource_size(&r);
+	adsp->mem_region = devm_ioremap_wc(adsp->dev, adsp->mem_phys, adsp->mem_size);
+	if (!adsp->mem_region) {
+		dev_err(adsp->dev, "unable to map memory region: %pa+%zx\n",
+			&r.start, adsp->mem_size);
+		return -EBUSY;
+	}
+
+	return 0;
+}
+
+static int adsp_probe(struct platform_device *pdev)
+{
+	struct qcom_adsp *adsp;
+	struct rproc *rproc;
+	int ret;
+
+	if (!qcom_scm_is_available())
+		return -EPROBE_DEFER;
+
+	if (!qcom_scm_pas_supported(ADSP_PAS_ID)) {
+		dev_err(&pdev->dev, "PAS is not available for ADSP\n");
+		return -ENXIO;
+	}
+
+	rproc = rproc_alloc(&pdev->dev, pdev->name, &adsp_ops,
+			    ADSP_FIRMWARE_NAME, sizeof(*adsp));
+	if (!rproc) {
+		dev_err(&pdev->dev, "unable to allocate remoteproc\n");
+		return -ENOMEM;
+	}
+
+	rproc->fw_ops = &adsp_fw_ops;
+
+	adsp = (struct qcom_adsp *)rproc->priv;
+	adsp->dev = &pdev->dev;
+	adsp->rproc = rproc;
+	platform_set_drvdata(pdev, adsp);
+
+	init_completion(&adsp->start_done);
+	init_completion(&adsp->stop_done);
+
+	ret = adsp_alloc_memory_region(adsp);
+	if (ret)
+		goto free_rproc;
+
+	ret = adsp_init_clock(adsp);
+	if (ret)
+		goto free_rproc;
+
+	ret = adsp_init_regulator(adsp);
+	if (ret)
+		goto free_rproc;
+
+	ret = adsp_request_irq(adsp, pdev, "wdog", adsp_wdog_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->wdog_irq = ret;
+
+	ret = adsp_request_irq(adsp, pdev, "fatal", adsp_fatal_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->fatal_irq = ret;
+
+	ret = adsp_request_irq(adsp, pdev, "ready", adsp_ready_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->ready_irq = ret;
+
+	ret = adsp_request_irq(adsp, pdev, "handover", adsp_handover_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->handover_irq = ret;
+
+	ret = adsp_request_irq(adsp, pdev, "stop-ack", adsp_stop_ack_interrupt);
+	if (ret < 0)
+		goto free_rproc;
+	adsp->stop_ack_irq = ret;
+
+	adsp->state = qcom_smem_state_get(&pdev->dev, "stop",
+					  &adsp->stop_bit);
+	if (IS_ERR(adsp->state)) {
+		ret = PTR_ERR(adsp->state);
+		goto free_rproc;
+	}
+
+	ret = rproc_add(rproc);
+	if (ret)
+		goto free_rproc;
+
+	return 0;
+
+free_rproc:
+	rproc_free(rproc);
+
+	return ret;
+}
+
+static int adsp_remove(struct platform_device *pdev)
+{
+	struct qcom_adsp *adsp = platform_get_drvdata(pdev);
+
+	qcom_smem_state_put(adsp->state);
+	rproc_del(adsp->rproc);
+	rproc_free(adsp->rproc);
+
+	return 0;
+}
+
+static const struct of_device_id adsp_of_match[] = {
+	{ .compatible = "qcom,msm8974-adsp-pil" },
+	{ .compatible = "qcom,msm8996-adsp-pil" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, adsp_of_match);
+
+static struct platform_driver adsp_driver = {
+	.probe = adsp_probe,
+	.remove = adsp_remove,
+	.driver = {
+		.name = "qcom_adsp_pil",
+		.of_match_table = adsp_of_match,
+	},
+};
+
+module_platform_driver(adsp_driver);
+MODULE_DESCRIPTION("Qualcomm MSM8974/MSM8996 ADSP Peripherial Image Loader");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/remoteproc/qcom_mdt_loader.c b/drivers/remoteproc/qcom_mdt_loader.c
index 114e8e4cef67..2ff18cd6c096 100644
--- a/drivers/remoteproc/qcom_mdt_loader.c
+++ b/drivers/remoteproc/qcom_mdt_loader.c
@@ -20,6 +20,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/remoteproc.h>
+#include <linux/sizes.h>
 #include <linux/slab.h>
 
 #include "remoteproc_internal.h"
diff --git a/drivers/remoteproc/qcom_q6v5_pil.c b/drivers/remoteproc/qcom_q6v5_pil.c
index 2e0caaaa766a..b08989b48df7 100644
--- a/drivers/remoteproc/qcom_q6v5_pil.c
+++ b/drivers/remoteproc/qcom_q6v5_pil.c
@@ -894,6 +894,7 @@ static const struct of_device_id q6v5_of_match[] = {
 	{ .compatible = "qcom,q6v5-pil", },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, q6v5_of_match);
 
 static struct platform_driver q6v5_driver = {
 	.probe = q6v5_probe,
diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_wcnss.c
index f5cedeaafba1..ebd61f5d18bb 100644
--- a/drivers/remoteproc/qcom_wcnss.c
+++ b/drivers/remoteproc/qcom_wcnss.c
@@ -30,6 +30,7 @@
 #include <linux/remoteproc.h>
 #include <linux/soc/qcom/smem.h>
 #include <linux/soc/qcom/smem_state.h>
+#include <linux/rpmsg/qcom_smd.h>
 
 #include "qcom_mdt_loader.h"
 #include "remoteproc_internal.h"
@@ -94,6 +95,10 @@ struct qcom_wcnss {
 	phys_addr_t mem_reloc;
 	void *mem_region;
 	size_t mem_size;
+
+	struct device_node *smd_node;
+	struct qcom_smd_edge *smd_edge;
+	struct rproc_subdev smd_subdev;
 };
 
 static const struct wcnss_data riva_data = {
@@ -143,7 +148,6 @@ void qcom_wcnss_assign_iris(struct qcom_wcnss *wcnss,
 
 	mutex_unlock(&wcnss->iris_lock);
 }
-EXPORT_SYMBOL_GPL(qcom_wcnss_assign_iris);
 
 static int wcnss_load(struct rproc *rproc, const struct firmware *fw)
 {
@@ -396,6 +400,23 @@ static irqreturn_t wcnss_stop_ack_interrupt(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
+static int wcnss_smd_probe(struct rproc_subdev *subdev)
+{
+	struct qcom_wcnss *wcnss = container_of(subdev, struct qcom_wcnss, smd_subdev);
+
+	wcnss->smd_edge = qcom_smd_register_edge(wcnss->dev, wcnss->smd_node);
+
+	return IS_ERR(wcnss->smd_edge) ? PTR_ERR(wcnss->smd_edge) : 0;
+}
+
+static void wcnss_smd_remove(struct rproc_subdev *subdev)
+{
+	struct qcom_wcnss *wcnss = container_of(subdev, struct qcom_wcnss, smd_subdev);
+
+	qcom_smd_unregister_edge(wcnss->smd_edge);
+	wcnss->smd_edge = NULL;
+}
+
 static int wcnss_init_regulators(struct qcom_wcnss *wcnss,
 				 const struct wcnss_vreg_info *info,
 				 int num_vregs)
@@ -578,6 +599,10 @@ static int wcnss_probe(struct platform_device *pdev)
 		}
 	}
 
+	wcnss->smd_node = of_get_child_by_name(pdev->dev.of_node, "smd-edge");
+	if (wcnss->smd_node)
+		rproc_add_subdev(rproc, &wcnss->smd_subdev, wcnss_smd_probe, wcnss_smd_remove);
+
 	ret = rproc_add(rproc);
 	if (ret)
 		goto free_rproc;
@@ -596,6 +621,7 @@ static int wcnss_remove(struct platform_device *pdev)
 
 	of_platform_depopulate(&pdev->dev);
 
+	of_node_put(wcnss->smd_node);
 	qcom_smem_state_put(wcnss->state);
 	rproc_del(wcnss->rproc);
 	rproc_free(wcnss->rproc);
@@ -609,6 +635,7 @@ static const struct of_device_id wcnss_of_match[] = {
 	{ .compatible = "qcom,pronto-v2-pil", &pronto_v2_data },
 	{ },
 };
+MODULE_DEVICE_TABLE(of, wcnss_of_match);
 
 static struct platform_driver wcnss_driver = {
 	.probe = wcnss_probe,
@@ -619,6 +646,28 @@ static struct platform_driver wcnss_driver = {
 	},
 };
 
-module_platform_driver(wcnss_driver);
+static int __init wcnss_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&wcnss_driver);
+	if (ret)
+		return ret;
+
+	ret = platform_driver_register(&qcom_iris_driver);
+	if (ret)
+		platform_driver_unregister(&wcnss_driver);
+
+	return ret;
+}
+module_init(wcnss_init);
+
+static void __exit wcnss_exit(void)
+{
+	platform_driver_unregister(&qcom_iris_driver);
+	platform_driver_unregister(&wcnss_driver);
+}
+module_exit(wcnss_exit);
+
 MODULE_DESCRIPTION("Qualcomm Peripherial Image Loader for Wireless Subsystem");
 MODULE_LICENSE("GPL v2");
diff --git a/drivers/remoteproc/qcom_wcnss.h b/drivers/remoteproc/qcom_wcnss.h
index 9dc4a9fe41e1..25fb7f62a457 100644
--- a/drivers/remoteproc/qcom_wcnss.h
+++ b/drivers/remoteproc/qcom_wcnss.h
@@ -4,6 +4,8 @@
 struct qcom_iris;
 struct qcom_wcnss;
 
+extern struct platform_driver qcom_iris_driver;
+
 struct wcnss_vreg_info {
 	const char * const name;
 	int min_voltage;
diff --git a/drivers/remoteproc/qcom_wcnss_iris.c b/drivers/remoteproc/qcom_wcnss_iris.c
index f0ca24a8dd0b..e842be58e8c7 100644
--- a/drivers/remoteproc/qcom_wcnss_iris.c
+++ b/drivers/remoteproc/qcom_wcnss_iris.c
@@ -94,14 +94,12 @@ disable_regulators:
 
 	return ret;
 }
-EXPORT_SYMBOL_GPL(qcom_iris_enable);
 
 void qcom_iris_disable(struct qcom_iris *iris)
 {
 	clk_disable_unprepare(iris->xo_clk);
 	regulator_bulk_disable(iris->num_vregs, iris->vregs);
 }
-EXPORT_SYMBOL_GPL(qcom_iris_disable);
 
 static int qcom_iris_probe(struct platform_device *pdev)
 {
@@ -173,8 +171,9 @@ static const struct of_device_id iris_of_match[] = {
 	{ .compatible = "qcom,wcn3680", .data = &wcn3680_data },
 	{}
 };
+MODULE_DEVICE_TABLE(of, iris_of_match);
 
-static struct platform_driver wcnss_driver = {
+struct platform_driver qcom_iris_driver = {
 	.probe = qcom_iris_probe,
 	.remove = qcom_iris_remove,
 	.driver = {
@@ -182,7 +181,3 @@ static struct platform_driver wcnss_driver = {
 		.of_match_table = iris_of_match,
 	},
 };
-
-module_platform_driver(wcnss_driver);
-MODULE_DESCRIPTION("Qualcomm Wireless Subsystem Iris driver");
-MODULE_LICENSE("GPL v2");
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index c6bfb3496684..f0f6ec1ab12b 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -236,6 +236,10 @@ int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
 	}
 	notifyid = ret;
 
+	/* Potentially bump max_notifyid */
+	if (notifyid > rproc->max_notifyid)
+		rproc->max_notifyid = notifyid;
+
 	dev_dbg(dev, "vring%d: va %p dma %pad size 0x%x idr %d\n",
 		i, va, &dma, size, notifyid);
 
@@ -296,6 +300,20 @@ void rproc_free_vring(struct rproc_vring *rvring)
 	rsc->vring[idx].notifyid = -1;
 }
 
+static int rproc_vdev_do_probe(struct rproc_subdev *subdev)
+{
+	struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
+
+	return rproc_add_virtio_dev(rvdev, rvdev->id);
+}
+
+static void rproc_vdev_do_remove(struct rproc_subdev *subdev)
+{
+	struct rproc_vdev *rvdev = container_of(subdev, struct rproc_vdev, subdev);
+
+	rproc_remove_virtio_dev(rvdev);
+}
+
 /**
  * rproc_handle_vdev() - handle a vdev fw resource
  * @rproc: the remote processor
@@ -356,6 +374,9 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
 	if (!rvdev)
 		return -ENOMEM;
 
+	kref_init(&rvdev->refcount);
+
+	rvdev->id = rsc->id;
 	rvdev->rproc = rproc;
 
 	/* parse the vrings */
@@ -368,22 +389,51 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
 	/* remember the resource offset*/
 	rvdev->rsc_offset = offset;
 
+	/* allocate the vring resources */
+	for (i = 0; i < rsc->num_of_vrings; i++) {
+		ret = rproc_alloc_vring(rvdev, i);
+		if (ret)
+			goto unwind_vring_allocations;
+	}
+
+	/* track the rvdevs list reference */
+	kref_get(&rvdev->refcount);
+
 	list_add_tail(&rvdev->node, &rproc->rvdevs);
 
-	/* it is now safe to add the virtio device */
-	ret = rproc_add_virtio_dev(rvdev, rsc->id);
-	if (ret)
-		goto remove_rvdev;
+	rproc_add_subdev(rproc, &rvdev->subdev,
+			 rproc_vdev_do_probe, rproc_vdev_do_remove);
 
 	return 0;
 
-remove_rvdev:
-	list_del(&rvdev->node);
+unwind_vring_allocations:
+	for (i--; i >= 0; i--)
+		rproc_free_vring(&rvdev->vring[i]);
 free_rvdev:
 	kfree(rvdev);
 	return ret;
 }
 
+void rproc_vdev_release(struct kref *ref)
+{
+	struct rproc_vdev *rvdev = container_of(ref, struct rproc_vdev, refcount);
+	struct rproc_vring *rvring;
+	struct rproc *rproc = rvdev->rproc;
+	int id;
+
+	for (id = 0; id < ARRAY_SIZE(rvdev->vring); id++) {
+		rvring = &rvdev->vring[id];
+		if (!rvring->va)
+			continue;
+
+		rproc_free_vring(rvring);
+	}
+
+	rproc_remove_subdev(rproc, &rvdev->subdev);
+	list_del(&rvdev->node);
+	kfree(rvdev);
+}
+
 /**
  * rproc_handle_trace() - handle a shared trace buffer resource
  * @rproc: the remote processor
@@ -673,15 +723,6 @@ free_carv:
 	return ret;
 }
 
-static int rproc_count_vrings(struct rproc *rproc, struct fw_rsc_vdev *rsc,
-			      int offset, int avail)
-{
-	/* Summarize the number of notification IDs */
-	rproc->max_notifyid += rsc->num_of_vrings;
-
-	return 0;
-}
-
 /*
  * A lookup table for resource handlers. The indices are defined in
  * enum fw_resource_type.
@@ -690,10 +731,6 @@ static rproc_handle_resource_t rproc_loading_handlers[RSC_LAST] = {
 	[RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout,
 	[RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem,
 	[RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace,
-	[RSC_VDEV] = (rproc_handle_resource_t)rproc_count_vrings,
-};
-
-static rproc_handle_resource_t rproc_vdev_handler[RSC_LAST] = {
 	[RSC_VDEV] = (rproc_handle_resource_t)rproc_handle_vdev,
 };
 
@@ -736,6 +773,34 @@ static int rproc_handle_resources(struct rproc *rproc, int len,
 	return ret;
 }
 
+static int rproc_probe_subdevices(struct rproc *rproc)
+{
+	struct rproc_subdev *subdev;
+	int ret;
+
+	list_for_each_entry(subdev, &rproc->subdevs, node) {
+		ret = subdev->probe(subdev);
+		if (ret)
+			goto unroll_registration;
+	}
+
+	return 0;
+
+unroll_registration:
+	list_for_each_entry_continue_reverse(subdev, &rproc->subdevs, node)
+		subdev->remove(subdev);
+
+	return ret;
+}
+
+static void rproc_remove_subdevices(struct rproc *rproc)
+{
+	struct rproc_subdev *subdev;
+
+	list_for_each_entry(subdev, &rproc->subdevs, node)
+		subdev->remove(subdev);
+}
+
 /**
  * rproc_resource_cleanup() - clean up and free all acquired resources
  * @rproc: rproc handle
@@ -782,7 +847,7 @@ static void rproc_resource_cleanup(struct rproc *rproc)
 
 	/* clean up remote vdev entries */
 	list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node)
-		rproc_remove_virtio_dev(rvdev);
+		kref_put(&rvdev->refcount, rproc_vdev_release);
 }
 
 /*
@@ -824,25 +889,16 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 	/*
 	 * Create a copy of the resource table. When a virtio device starts
 	 * and calls vring_new_virtqueue() the address of the allocated vring
-	 * will be stored in the cached_table. Before the device is started,
-	 * cached_table will be copied into device memory.
+	 * will be stored in the table_ptr. Before the device is started,
+	 * table_ptr will be copied into device memory.
 	 */
-	rproc->cached_table = kmemdup(table, tablesz, GFP_KERNEL);
-	if (!rproc->cached_table)
+	rproc->table_ptr = kmemdup(table, tablesz, GFP_KERNEL);
+	if (!rproc->table_ptr)
 		goto clean_up;
 
-	rproc->table_ptr = rproc->cached_table;
-
 	/* reset max_notifyid */
 	rproc->max_notifyid = -1;
 
-	/* look for virtio devices and register them */
-	ret = rproc_handle_resources(rproc, tablesz, rproc_vdev_handler);
-	if (ret) {
-		dev_err(dev, "Failed to handle vdev resources: %d\n", ret);
-		goto clean_up;
-	}
-
 	/* handle fw resources which are required to boot rproc */
 	ret = rproc_handle_resources(rproc, tablesz, rproc_loading_handlers);
 	if (ret) {
@@ -858,18 +914,16 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 	}
 
 	/*
-	 * The starting device has been given the rproc->cached_table as the
+	 * The starting device has been given the rproc->table_ptr as the
 	 * resource table. The address of the vring along with the other
-	 * allocated resources (carveouts etc) is stored in cached_table.
+	 * allocated resources (carveouts etc) is stored in table_ptr.
 	 * In order to pass this information to the remote device we must copy
 	 * this information to device memory. We also update the table_ptr so
 	 * that any subsequent changes will be applied to the loaded version.
 	 */
 	loaded_table = rproc_find_loaded_rsc_table(rproc, fw);
-	if (loaded_table) {
-		memcpy(loaded_table, rproc->cached_table, tablesz);
-		rproc->table_ptr = loaded_table;
-	}
+	if (loaded_table)
+		memcpy(loaded_table, rproc->table_ptr, tablesz);
 
 	/* power up the remote processor */
 	ret = rproc->ops->start(rproc);
@@ -878,17 +932,26 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
 		goto clean_up_resources;
 	}
 
+	/* probe any subdevices for the remote processor */
+	ret = rproc_probe_subdevices(rproc);
+	if (ret) {
+		dev_err(dev, "failed to probe subdevices for %s: %d\n",
+			rproc->name, ret);
+		goto stop_rproc;
+	}
+
 	rproc->state = RPROC_RUNNING;
 
 	dev_info(dev, "remote processor %s is now up\n", rproc->name);
 
 	return 0;
 
+stop_rproc:
+	rproc->ops->stop(rproc);
 clean_up_resources:
 	rproc_resource_cleanup(rproc);
 clean_up:
-	kfree(rproc->cached_table);
-	rproc->cached_table = NULL;
+	kfree(rproc->table_ptr);
 	rproc->table_ptr = NULL;
 
 	rproc_disable_iommu(rproc);
@@ -1121,6 +1184,9 @@ void rproc_shutdown(struct rproc *rproc)
 	if (!atomic_dec_and_test(&rproc->power))
 		goto out;
 
+	/* remove any subdevices for the remote processor */
+	rproc_remove_subdevices(rproc);
+
 	/* power off the remote processor */
 	ret = rproc->ops->stop(rproc);
 	if (ret) {
@@ -1135,8 +1201,7 @@ void rproc_shutdown(struct rproc *rproc)
 	rproc_disable_iommu(rproc);
 
 	/* Free the copy of the resource table */
-	kfree(rproc->cached_table);
-	rproc->cached_table = NULL;
+	kfree(rproc->table_ptr);
 	rproc->table_ptr = NULL;
 
 	/* if in crash state, unlock crash handler */
@@ -1273,6 +1338,7 @@ static void rproc_type_release(struct device *dev)
 	if (rproc->index >= 0)
 		ida_simple_remove(&rproc_dev_index, rproc->index);
 
+	kfree(rproc->firmware);
 	kfree(rproc);
 }
 
@@ -1310,31 +1376,31 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
 {
 	struct rproc *rproc;
 	char *p, *template = "rproc-%s-fw";
-	int name_len = 0;
+	int name_len;
 
 	if (!dev || !name || !ops)
 		return NULL;
 
-	if (!firmware)
+	if (!firmware) {
 		/*
-		 * Make room for default firmware name (minus %s plus '\0').
 		 * If the caller didn't pass in a firmware name then
-		 * construct a default name.  We're already glomming 'len'
-		 * bytes onto the end of the struct rproc allocation, so do
-		 * a few more for the default firmware name (but only if
-		 * the caller doesn't pass one).
+		 * construct a default name.
 		 */
 		name_len = strlen(name) + strlen(template) - 2 + 1;
-
-	rproc = kzalloc(sizeof(*rproc) + len + name_len, GFP_KERNEL);
-	if (!rproc)
-		return NULL;
-
-	if (!firmware) {
-		p = (char *)rproc + sizeof(struct rproc) + len;
+		p = kmalloc(name_len, GFP_KERNEL);
+		if (!p)
+			return NULL;
 		snprintf(p, name_len, template, name);
 	} else {
-		p = (char *)firmware;
+		p = kstrdup(firmware, GFP_KERNEL);
+		if (!p)
+			return NULL;
+	}
+
+	rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL);
+	if (!rproc) {
+		kfree(p);
+		return NULL;
 	}
 
 	rproc->firmware = p;
@@ -1346,6 +1412,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
 	device_initialize(&rproc->dev);
 	rproc->dev.parent = dev;
 	rproc->dev.type = &rproc_type;
+	rproc->dev.class = &rproc_class;
 
 	/* Assign a unique device index and name */
 	rproc->index = ida_simple_get(&rproc_dev_index, 0, 0, GFP_KERNEL);
@@ -1370,6 +1437,7 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
 	INIT_LIST_HEAD(&rproc->mappings);
 	INIT_LIST_HEAD(&rproc->traces);
 	INIT_LIST_HEAD(&rproc->rvdevs);
+	INIT_LIST_HEAD(&rproc->subdevs);
 
 	INIT_WORK(&rproc->crash_handler, rproc_crash_handler_work);
 	init_completion(&rproc->crash_comp);
@@ -1428,8 +1496,6 @@ EXPORT_SYMBOL(rproc_put);
  */
 int rproc_del(struct rproc *rproc)
 {
-	struct rproc_vdev *rvdev, *tmp;
-
 	if (!rproc)
 		return -EINVAL;
 
@@ -1441,10 +1507,6 @@ int rproc_del(struct rproc *rproc)
 	if (rproc->auto_boot)
 		rproc_shutdown(rproc);
 
-	/* clean up remote vdev entries */
-	list_for_each_entry_safe(rvdev, tmp, &rproc->rvdevs, node)
-		rproc_remove_virtio_dev(rvdev);
-
 	/* the rproc is downref'ed as soon as it's removed from the klist */
 	mutex_lock(&rproc_list_mutex);
 	list_del(&rproc->node);
@@ -1457,6 +1519,36 @@ int rproc_del(struct rproc *rproc)
 EXPORT_SYMBOL(rproc_del);
 
 /**
+ * rproc_add_subdev() - add a subdevice to a remoteproc
+ * @rproc: rproc handle to add the subdevice to
+ * @subdev: subdev handle to register
+ * @probe: function to call when the rproc boots
+ * @remove: function to call when the rproc shuts down
+ */
+void rproc_add_subdev(struct rproc *rproc,
+		      struct rproc_subdev *subdev,
+		      int (*probe)(struct rproc_subdev *subdev),
+		      void (*remove)(struct rproc_subdev *subdev))
+{
+	subdev->probe = probe;
+	subdev->remove = remove;
+
+	list_add_tail(&subdev->node, &rproc->subdevs);
+}
+EXPORT_SYMBOL(rproc_add_subdev);
+
+/**
+ * rproc_remove_subdev() - remove a subdevice from a remoteproc
+ * @rproc: rproc handle to remove the subdevice from
+ * @subdev: subdev handle, previously registered with rproc_add_subdev()
+ */
+void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev)
+{
+	list_del(&subdev->node);
+}
+EXPORT_SYMBOL(rproc_remove_subdev);
+
+/**
  * rproc_report_crash() - rproc crash reporter function
  * @rproc: remote processor
  * @type: crash type
@@ -1484,6 +1576,7 @@ EXPORT_SYMBOL(rproc_report_crash);
 
 static int __init remoteproc_init(void)
 {
+	rproc_init_sysfs();
 	rproc_init_debugfs();
 
 	return 0;
@@ -1495,6 +1588,7 @@ static void __exit remoteproc_exit(void)
 	ida_destroy(&rproc_dev_index);
 
 	rproc_exit_debugfs();
+	rproc_exit_sysfs();
 }
 module_exit(remoteproc_exit);
 
diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c
index 374797206c79..1c122e230cec 100644
--- a/drivers/remoteproc/remoteproc_debugfs.c
+++ b/drivers/remoteproc/remoteproc_debugfs.c
@@ -59,75 +59,6 @@ static const struct file_operations trace_rproc_ops = {
 	.llseek	= generic_file_llseek,
 };
 
-/*
- * A state-to-string lookup table, for exposing a human readable state
- * via debugfs. Always keep in sync with enum rproc_state
- */
-static const char * const rproc_state_string[] = {
-	"offline",
-	"suspended",
-	"running",
-	"crashed",
-	"invalid",
-};
-
-/* expose the state of the remote processor via debugfs */
-static ssize_t rproc_state_read(struct file *filp, char __user *userbuf,
-				size_t count, loff_t *ppos)
-{
-	struct rproc *rproc = filp->private_data;
-	unsigned int state;
-	char buf[30];
-	int i;
-
-	state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state;
-
-	i = scnprintf(buf, 30, "%.28s (%d)\n", rproc_state_string[state],
-		      rproc->state);
-
-	return simple_read_from_buffer(userbuf, count, ppos, buf, i);
-}
-
-static ssize_t rproc_state_write(struct file *filp, const char __user *userbuf,
-				 size_t count, loff_t *ppos)
-{
-	struct rproc *rproc = filp->private_data;
-	char buf[10];
-	int ret;
-
-	if (count > sizeof(buf) || count <= 0)
-		return -EINVAL;
-
-	ret = copy_from_user(buf, userbuf, count);
-	if (ret)
-		return -EFAULT;
-
-	if (buf[count - 1] == '\n')
-		buf[count - 1] = '\0';
-
-	if (!strncmp(buf, "start", count)) {
-		ret = rproc_boot(rproc);
-		if (ret) {
-			dev_err(&rproc->dev, "Boot failed: %d\n", ret);
-			return ret;
-		}
-	} else if (!strncmp(buf, "stop", count)) {
-		rproc_shutdown(rproc);
-	} else {
-		dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
-		return -EINVAL;
-	}
-
-	return count;
-}
-
-static const struct file_operations rproc_state_ops = {
-	.read = rproc_state_read,
-	.write = rproc_state_write,
-	.open = simple_open,
-	.llseek	= generic_file_llseek,
-};
-
 /* expose the name of the remote processor via debugfs */
 static ssize_t rproc_name_read(struct file *filp, char __user *userbuf,
 			       size_t count, loff_t *ppos)
@@ -265,8 +196,6 @@ void rproc_create_debug_dir(struct rproc *rproc)
 
 	debugfs_create_file("name", 0400, rproc->dbg_dir,
 			    rproc, &rproc_name_ops);
-	debugfs_create_file("state", 0400, rproc->dbg_dir,
-			    rproc, &rproc_state_ops);
 	debugfs_create_file("recovery", 0400, rproc->dbg_dir,
 			    rproc, &rproc_recovery_ops);
 }
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
index 4cf93ca2816e..1e9e5b3f021c 100644
--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -49,6 +49,7 @@ struct rproc_fw_ops {
 void rproc_release(struct kref *kref);
 irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
 int rproc_boot_nowait(struct rproc *rproc);
+void rproc_vdev_release(struct kref *ref);
 
 /* from remoteproc_virtio.c */
 int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id);
@@ -63,6 +64,11 @@ void rproc_create_debug_dir(struct rproc *rproc);
 void rproc_init_debugfs(void);
 void rproc_exit_debugfs(void);
 
+/* from remoteproc_sysfs.c */
+extern struct class rproc_class;
+int rproc_init_sysfs(void);
+void rproc_exit_sysfs(void);
+
 void rproc_free_vring(struct rproc_vring *rvring);
 int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
 
diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
new file mode 100644
index 000000000000..bc5b0e00efb1
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_sysfs.c
@@ -0,0 +1,151 @@
+/*
+ * Remote Processor Framework
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/remoteproc.h>
+
+#include "remoteproc_internal.h"
+
+#define to_rproc(d) container_of(d, struct rproc, dev)
+
+/* Expose the loaded / running firmware name via sysfs */
+static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct rproc *rproc = to_rproc(dev);
+
+	return sprintf(buf, "%s\n", rproc->firmware);
+}
+
+/* Change firmware name via sysfs */
+static ssize_t firmware_store(struct device *dev,
+			      struct device_attribute *attr,
+			      const char *buf, size_t count)
+{
+	struct rproc *rproc = to_rproc(dev);
+	char *p;
+	int err, len = count;
+
+	err = mutex_lock_interruptible(&rproc->lock);
+	if (err) {
+		dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, err);
+		return -EINVAL;
+	}
+
+	if (rproc->state != RPROC_OFFLINE) {
+		dev_err(dev, "can't change firmware while running\n");
+		err = -EBUSY;
+		goto out;
+	}
+
+	len = strcspn(buf, "\n");
+
+	p = kstrndup(buf, len, GFP_KERNEL);
+	if (!p) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	kfree(rproc->firmware);
+	rproc->firmware = p;
+out:
+	mutex_unlock(&rproc->lock);
+
+	return err ? err : count;
+}
+static DEVICE_ATTR_RW(firmware);
+
+/*
+ * A state-to-string lookup table, for exposing a human readable state
+ * via sysfs. Always keep in sync with enum rproc_state
+ */
+static const char * const rproc_state_string[] = {
+	[RPROC_OFFLINE]		= "offline",
+	[RPROC_SUSPENDED]	= "suspended",
+	[RPROC_RUNNING]		= "running",
+	[RPROC_CRASHED]		= "crashed",
+	[RPROC_LAST]		= "invalid",
+};
+
+/* Expose the state of the remote processor via sysfs */
+static ssize_t state_show(struct device *dev, struct device_attribute *attr,
+			  char *buf)
+{
+	struct rproc *rproc = to_rproc(dev);
+	unsigned int state;
+
+	state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state;
+	return sprintf(buf, "%s\n", rproc_state_string[state]);
+}
+
+/* Change remote processor state via sysfs */
+static ssize_t state_store(struct device *dev,
+			      struct device_attribute *attr,
+			      const char *buf, size_t count)
+{
+	struct rproc *rproc = to_rproc(dev);
+	int ret = 0;
+
+	if (sysfs_streq(buf, "start")) {
+		if (rproc->state == RPROC_RUNNING)
+			return -EBUSY;
+
+		ret = rproc_boot(rproc);
+		if (ret)
+			dev_err(&rproc->dev, "Boot failed: %d\n", ret);
+	} else if (sysfs_streq(buf, "stop")) {
+		if (rproc->state != RPROC_RUNNING)
+			return -EINVAL;
+
+		rproc_shutdown(rproc);
+	} else {
+		dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
+		ret = -EINVAL;
+	}
+	return ret ? ret : count;
+}
+static DEVICE_ATTR_RW(state);
+
+static struct attribute *rproc_attrs[] = {
+	&dev_attr_firmware.attr,
+	&dev_attr_state.attr,
+	NULL
+};
+
+static const struct attribute_group rproc_devgroup = {
+	.attrs = rproc_attrs
+};
+
+static const struct attribute_group *rproc_devgroups[] = {
+	&rproc_devgroup,
+	NULL
+};
+
+struct class rproc_class = {
+	.name		= "remoteproc",
+	.dev_groups	= rproc_devgroups,
+};
+
+int __init rproc_init_sysfs(void)
+{
+	/* create remoteproc device class for sysfs */
+	int err = class_register(&rproc_class);
+
+	if (err)
+		pr_err("remoteproc: unable to register class\n");
+	return err;
+}
+
+void __exit rproc_exit_sysfs(void)
+{
+	class_unregister(&rproc_class);
+}
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 01870a16d6d2..364411fb7734 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -79,7 +79,7 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
 	struct rproc_vring *rvring;
 	struct virtqueue *vq;
 	void *addr;
-	int len, size, ret;
+	int len, size;
 
 	/* we're temporarily limited to two virtqueues per rvdev */
 	if (id >= ARRAY_SIZE(rvdev->vring))
@@ -88,10 +88,6 @@ static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
 	if (!name)
 		return NULL;
 
-	ret = rproc_alloc_vring(rvdev, id);
-	if (ret)
-		return ERR_PTR(ret);
-
 	rvring = &rvdev->vring[id];
 	addr = rvring->va;
 	len = rvring->len;
@@ -130,7 +126,6 @@ static void __rproc_virtio_del_vqs(struct virtio_device *vdev)
 		rvring = vq->priv;
 		rvring->vq = NULL;
 		vring_del_virtqueue(vq);
-		rproc_free_vring(rvring);
 	}
 }
 
@@ -282,14 +277,13 @@ static const struct virtio_config_ops rproc_virtio_config_ops = {
  * Never call this function directly; it will be called by the driver
  * core when needed.
  */
-static void rproc_vdev_release(struct device *dev)
+static void rproc_virtio_dev_release(struct device *dev)
 {
 	struct virtio_device *vdev = dev_to_virtio(dev);
 	struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
 	struct rproc *rproc = vdev_to_rproc(vdev);
 
-	list_del(&rvdev->node);
-	kfree(rvdev);
+	kref_put(&rvdev->refcount, rproc_vdev_release);
 
 	put_device(&rproc->dev);
 }
@@ -313,7 +307,7 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
 	vdev->id.device	= id,
 	vdev->config = &rproc_virtio_config_ops,
 	vdev->dev.parent = dev;
-	vdev->dev.release = rproc_vdev_release;
+	vdev->dev.release = rproc_virtio_dev_release;
 
 	/*
 	 * We're indirectly making a non-temporary copy of the rproc pointer
@@ -325,6 +319,9 @@ int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
 	 */
 	get_device(&rproc->dev);
 
+	/* Reference the vdev and vring allocations */
+	kref_get(&rvdev->refcount);
+
 	ret = register_virtio_device(vdev);
 	if (ret) {
 		put_device(&rproc->dev);
diff --git a/drivers/remoteproc/st_remoteproc.c b/drivers/remoteproc/st_remoteproc.c
index ae8963fcc8c8..da4e152e9733 100644
--- a/drivers/remoteproc/st_remoteproc.c
+++ b/drivers/remoteproc/st_remoteproc.c
@@ -245,8 +245,10 @@ static int st_rproc_probe(struct platform_device *pdev)
 		goto free_rproc;
 
 	enabled = st_rproc_state(pdev);
-	if (enabled < 0)
+	if (enabled < 0) {
+		ret = enabled;
 		goto free_rproc;
+	}
 
 	if (enabled) {
 		atomic_inc(&rproc->power);
diff --git a/drivers/remoteproc/st_slim_rproc.c b/drivers/remoteproc/st_slim_rproc.c
index 1484e9717946..507716c8721f 100644
--- a/drivers/remoteproc/st_slim_rproc.c
+++ b/drivers/remoteproc/st_slim_rproc.c
@@ -330,7 +330,7 @@ err_clk_put:
 	for (i = 0; i < ST_SLIM_MAX_CLK && slim_rproc->clks[i]; i++)
 		clk_put(slim_rproc->clks[i]);
 err:
-	rproc_put(rproc);
+	rproc_free(rproc);
 	return ERR_PTR(err);
 }
 EXPORT_SYMBOL(st_slim_rproc_alloc);
@@ -355,7 +355,7 @@ void st_slim_rproc_put(struct st_slim_rproc *slim_rproc)
 		clk_put(slim_rproc->clks[clk]);
 
 	rproc_del(slim_rproc->rproc);
-	rproc_put(slim_rproc->rproc);
+	rproc_free(slim_rproc->rproc);
 }
 EXPORT_SYMBOL(st_slim_rproc_put);
 
diff --git a/drivers/rpmsg/qcom_smd.c b/drivers/rpmsg/qcom_smd.c
index 06fef2b4c814..0fae48116a0d 100644
--- a/drivers/rpmsg/qcom_smd.c
+++ b/drivers/rpmsg/qcom_smd.c
@@ -25,6 +25,7 @@
 #include <linux/soc/qcom/smem.h>
 #include <linux/wait.h>
 #include <linux/rpmsg.h>
+#include <linux/rpmsg/qcom_smd.h>
 
 #include "rpmsg_internal.h"
 
@@ -739,7 +740,7 @@ static int __qcom_smd_send(struct qcom_smd_channel *channel, const void *data,
 
 	while (qcom_smd_get_tx_avail(channel) < tlen) {
 		if (!wait) {
-			ret = -ENOMEM;
+			ret = -EAGAIN;
 			goto out;
 		}
 
@@ -820,20 +821,13 @@ qcom_smd_find_channel(struct qcom_smd_edge *edge, const char *name)
 	struct qcom_smd_channel *channel;
 	struct qcom_smd_channel *ret = NULL;
 	unsigned long flags;
-	unsigned state;
 
 	spin_lock_irqsave(&edge->channels_lock, flags);
 	list_for_each_entry(channel, &edge->channels, list) {
-		if (strcmp(channel->name, name))
-			continue;
-
-		state = GET_RX_CHANNEL_INFO(channel, state);
-		if (state != SMD_CHANNEL_OPENING &&
-		    state != SMD_CHANNEL_OPENED)
-			continue;
-
-		ret = channel;
-		break;
+		if (!strcmp(channel->name, name)) {
+			ret = channel;
+			break;
+		}
 	}
 	spin_unlock_irqrestore(&edge->channels_lock, flags);
 
diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c
index b6ea9ffa7381..a79cb5a9e5f2 100644
--- a/drivers/rpmsg/rpmsg_core.c
+++ b/drivers/rpmsg/rpmsg_core.c
@@ -71,6 +71,9 @@ struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev,
 					rpmsg_rx_cb_t cb, void *priv,
 					struct rpmsg_channel_info chinfo)
 {
+	if (WARN_ON(!rpdev))
+		return ERR_PTR(-EINVAL);
+
 	return rpdev->ops->create_ept(rpdev, cb, priv, chinfo);
 }
 EXPORT_SYMBOL(rpmsg_create_ept);
@@ -80,11 +83,13 @@ EXPORT_SYMBOL(rpmsg_create_ept);
  * @ept: endpoing to destroy
  *
  * Should be used by drivers to destroy an rpmsg endpoint previously
- * created with rpmsg_create_ept().
+ * created with rpmsg_create_ept(). As with other types of "free" NULL
+ * is a valid parameter.
  */
 void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
 {
-	ept->ops->destroy_ept(ept);
+	if (ept)
+		ept->ops->destroy_ept(ept);
 }
 EXPORT_SYMBOL(rpmsg_destroy_ept);
 
@@ -108,6 +113,11 @@ EXPORT_SYMBOL(rpmsg_destroy_ept);
  */
 int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
 {
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->send)
+		return -ENXIO;
+
 	return ept->ops->send(ept, data, len);
 }
 EXPORT_SYMBOL(rpmsg_send);
@@ -132,6 +142,11 @@ EXPORT_SYMBOL(rpmsg_send);
  */
 int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
 {
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->sendto)
+		return -ENXIO;
+
 	return ept->ops->sendto(ept, data, len, dst);
 }
 EXPORT_SYMBOL(rpmsg_sendto);
@@ -159,6 +174,11 @@ EXPORT_SYMBOL(rpmsg_sendto);
 int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
 			  void *data, int len)
 {
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->send_offchannel)
+		return -ENXIO;
+
 	return ept->ops->send_offchannel(ept, src, dst, data, len);
 }
 EXPORT_SYMBOL(rpmsg_send_offchannel);
@@ -182,6 +202,11 @@ EXPORT_SYMBOL(rpmsg_send_offchannel);
  */
 int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
 {
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->trysend)
+		return -ENXIO;
+
 	return ept->ops->trysend(ept, data, len);
 }
 EXPORT_SYMBOL(rpmsg_trysend);
@@ -205,6 +230,11 @@ EXPORT_SYMBOL(rpmsg_trysend);
  */
 int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst)
 {
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->trysendto)
+		return -ENXIO;
+
 	return ept->ops->trysendto(ept, data, len, dst);
 }
 EXPORT_SYMBOL(rpmsg_trysendto);
@@ -231,6 +261,11 @@ EXPORT_SYMBOL(rpmsg_trysendto);
 int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
 			     void *data, int len)
 {
+	if (WARN_ON(!ept))
+		return -EINVAL;
+	if (!ept->ops->trysend_offchannel)
+		return -ENXIO;
+
 	return ept->ops->trysend_offchannel(ept, src, dst, data, len);
 }
 EXPORT_SYMBOL(rpmsg_trysend_offchannel);
@@ -315,6 +350,9 @@ static int rpmsg_dev_match(struct device *dev, struct device_driver *drv)
 	const struct rpmsg_device_id *ids = rpdrv->id_table;
 	unsigned int i;
 
+	if (rpdev->driver_override)
+		return !strcmp(rpdev->driver_override, drv->name);
+
 	if (ids)
 		for (i = 0; ids[i].name[0]; i++)
 			if (rpmsg_id_match(rpdev, &ids[i]))
@@ -344,27 +382,30 @@ static int rpmsg_dev_probe(struct device *dev)
 	struct rpmsg_device *rpdev = to_rpmsg_device(dev);
 	struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
 	struct rpmsg_channel_info chinfo = {};
-	struct rpmsg_endpoint *ept;
+	struct rpmsg_endpoint *ept = NULL;
 	int err;
 
-	strncpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE);
-	chinfo.src = rpdev->src;
-	chinfo.dst = RPMSG_ADDR_ANY;
+	if (rpdrv->callback) {
+		strncpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE);
+		chinfo.src = rpdev->src;
+		chinfo.dst = RPMSG_ADDR_ANY;
 
-	ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, chinfo);
-	if (!ept) {
-		dev_err(dev, "failed to create endpoint\n");
-		err = -ENOMEM;
-		goto out;
-	}
+		ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, chinfo);
+		if (!ept) {
+			dev_err(dev, "failed to create endpoint\n");
+			err = -ENOMEM;
+			goto out;
+		}
 
-	rpdev->ept = ept;
-	rpdev->src = ept->addr;
+		rpdev->ept = ept;
+		rpdev->src = ept->addr;
+	}
 
 	err = rpdrv->probe(rpdev);
 	if (err) {
 		dev_err(dev, "%s: failed: %d\n", __func__, err);
-		rpmsg_destroy_ept(ept);
+		if (ept)
+			rpmsg_destroy_ept(ept);
 		goto out;
 	}
 
@@ -385,7 +426,8 @@ static int rpmsg_dev_remove(struct device *dev)
 
 	rpdrv->remove(rpdev);
 
-	rpmsg_destroy_ept(rpdev->ept);
+	if (rpdev->ept)
+		rpmsg_destroy_ept(rpdev->ept);
 
 	return err;
 }
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 930023b7c825..e2f3a3281d8f 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -400,6 +400,7 @@ enum rproc_crash_type {
  * @firmware_loading_complete: marks e/o asynchronous firmware loading
  * @bootaddr: address of first instruction to boot rproc with (optional)
  * @rvdevs: list of remote virtio devices
+ * @subdevs: list of subdevices, to following the running state
  * @notifyids: idr for dynamically assigning rproc-wide unique notify ids
  * @index: index of this rproc device
  * @crash_handler: workqueue for handling a crash
@@ -407,15 +408,14 @@ enum rproc_crash_type {
  * @crash_comp: completion used to sync crash handler and the rproc reload
  * @recovery_disabled: flag that state if recovery was disabled
  * @max_notifyid: largest allocated notify id.
- * @table_ptr: pointer to the resource table in effect
- * @cached_table: copy of the resource table
+ * @table_ptr: our copy of the resource table
  * @has_iommu: flag to indicate if remote processor is behind an MMU
  */
 struct rproc {
 	struct list_head node;
 	struct iommu_domain *domain;
 	const char *name;
-	const char *firmware;
+	char *firmware;
 	void *priv;
 	const struct rproc_ops *ops;
 	struct device dev;
@@ -431,6 +431,7 @@ struct rproc {
 	struct completion firmware_loading_complete;
 	u32 bootaddr;
 	struct list_head rvdevs;
+	struct list_head subdevs;
 	struct idr notifyids;
 	int index;
 	struct work_struct crash_handler;
@@ -439,11 +440,23 @@ struct rproc {
 	bool recovery_disabled;
 	int max_notifyid;
 	struct resource_table *table_ptr;
-	struct resource_table *cached_table;
 	bool has_iommu;
 	bool auto_boot;
 };
 
+/**
+ * struct rproc_subdev - subdevice tied to a remoteproc
+ * @node: list node related to the rproc subdevs list
+ * @probe: probe function, called as the rproc is started
+ * @remove: remove function, called as the rproc is stopped
+ */
+struct rproc_subdev {
+	struct list_head node;
+
+	int (*probe)(struct rproc_subdev *subdev);
+	void (*remove)(struct rproc_subdev *subdev);
+};
+
 /* we currently support only two vrings per rvdev */
 
 #define RVDEV_NUM_VRINGS 2
@@ -472,6 +485,9 @@ struct rproc_vring {
 
 /**
  * struct rproc_vdev - remoteproc state for a supported virtio device
+ * @refcount: reference counter for the vdev and vring allocations
+ * @subdev: handle for registering the vdev as a rproc subdevice
+ * @id: virtio device id (as in virtio_ids.h)
  * @node: list node
  * @rproc: the rproc handle
  * @vdev: the virio device
@@ -479,6 +495,11 @@ struct rproc_vring {
  * @rsc_offset: offset of the vdev's resource entry
  */
 struct rproc_vdev {
+	struct kref refcount;
+
+	struct rproc_subdev subdev;
+
+	unsigned int id;
 	struct list_head node;
 	struct rproc *rproc;
 	struct virtio_device vdev;
@@ -511,4 +532,11 @@ static inline struct rproc *vdev_to_rproc(struct virtio_device *vdev)
 	return rvdev->rproc;
 }
 
+void rproc_add_subdev(struct rproc *rproc,
+		      struct rproc_subdev *subdev,
+		      int (*probe)(struct rproc_subdev *subdev),
+		      void (*remove)(struct rproc_subdev *subdev));
+
+void rproc_remove_subdev(struct rproc *rproc, struct rproc_subdev *subdev);
+
 #endif /* REMOTEPROC_H */
diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h
index 452d393cc8dd..18f9e1ae4b7e 100644
--- a/include/linux/rpmsg.h
+++ b/include/linux/rpmsg.h
@@ -37,6 +37,7 @@
 
 #include <linux/types.h>
 #include <linux/device.h>
+#include <linux/err.h>
 #include <linux/mod_devicetable.h>
 #include <linux/kref.h>
 #include <linux/mutex.h>
@@ -64,6 +65,7 @@ struct rpmsg_channel_info {
  * rpmsg_device - device that belong to the rpmsg bus
  * @dev: the device struct
  * @id: device id (used to match between rpmsg drivers and devices)
+ * @driver_override: driver name to force a match
  * @src: local address
  * @dst: destination address
  * @ept: the rpmsg endpoint of this channel
@@ -72,6 +74,7 @@ struct rpmsg_channel_info {
 struct rpmsg_device {
 	struct device dev;
 	struct rpmsg_device_id id;
+	char *driver_override;
 	u32 src;
 	u32 dst;
 	struct rpmsg_endpoint *ept;
@@ -132,6 +135,8 @@ struct rpmsg_driver {
 	int (*callback)(struct rpmsg_device *, void *, int, void *, u32);
 };
 
+#if IS_ENABLED(CONFIG_RPMSG)
+
 int register_rpmsg_device(struct rpmsg_device *dev);
 void unregister_rpmsg_device(struct rpmsg_device *dev);
 int __register_rpmsg_driver(struct rpmsg_driver *drv, struct module *owner);
@@ -141,6 +146,116 @@ struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *,
 					rpmsg_rx_cb_t cb, void *priv,
 					struct rpmsg_channel_info chinfo);
 
+int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
+int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
+			  void *data, int len);
+
+int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
+int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
+int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
+			     void *data, int len);
+
+#else
+
+static inline int register_rpmsg_device(struct rpmsg_device *dev)
+{
+	return -ENXIO;
+}
+
+static inline void unregister_rpmsg_device(struct rpmsg_device *dev)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+}
+
+static inline int __register_rpmsg_driver(struct rpmsg_driver *drv,
+					  struct module *owner)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return -ENXIO;
+}
+
+static inline void unregister_rpmsg_driver(struct rpmsg_driver *drv)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+}
+
+static inline void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+}
+
+static inline struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev,
+						      rpmsg_rx_cb_t cb,
+						      void *priv,
+						      struct rpmsg_channel_info chinfo)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return ERR_PTR(-ENXIO);
+}
+
+static inline int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return -ENXIO;
+}
+
+static inline int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len,
+			       u32 dst)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return -ENXIO;
+
+}
+
+static inline int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src,
+					u32 dst, void *data, int len)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return -ENXIO;
+}
+
+static inline int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return -ENXIO;
+}
+
+static inline int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data,
+				  int len, u32 dst)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return -ENXIO;
+}
+
+static inline int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src,
+					   u32 dst, void *data, int len)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+
+	return -ENXIO;
+}
+
+#endif /* IS_ENABLED(CONFIG_RPMSG) */
+
 /* use a macro to avoid include chaining to get THIS_MODULE */
 #define register_rpmsg_driver(drv) \
 	__register_rpmsg_driver(drv, THIS_MODULE)
@@ -157,14 +272,4 @@ struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *,
 	module_driver(__rpmsg_driver, register_rpmsg_driver, \
 			unregister_rpmsg_driver)
 
-int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len);
-int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
-int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
-			  void *data, int len);
-
-int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len);
-int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst);
-int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst,
-			     void *data, int len);
-
 #endif /* _LINUX_RPMSG_H */
diff --git a/include/linux/rpmsg/qcom_smd.h b/include/linux/rpmsg/qcom_smd.h
new file mode 100644
index 000000000000..e674b2e3074b
--- /dev/null
+++ b/include/linux/rpmsg/qcom_smd.h
@@ -0,0 +1,33 @@
+
+#ifndef _LINUX_RPMSG_QCOM_SMD_H
+#define _LINUX_RPMSG_QCOM_SMD_H
+
+#include <linux/device.h>
+
+struct qcom_smd_edge;
+
+#if IS_ENABLED(CONFIG_RPMSG_QCOM_SMD) || IS_ENABLED(CONFIG_QCOM_SMD)
+
+struct qcom_smd_edge *qcom_smd_register_edge(struct device *parent,
+					     struct device_node *node);
+int qcom_smd_unregister_edge(struct qcom_smd_edge *edge);
+
+#else
+
+static inline struct qcom_smd_edge *
+qcom_smd_register_edge(struct device *parent,
+		       struct device_node *node)
+{
+	return ERR_PTR(-ENXIO);
+}
+
+static inline int qcom_smd_unregister_edge(struct qcom_smd_edge *edge)
+{
+	/* This shouldn't be possible */
+	WARN_ON(1);
+	return -ENXIO;
+}
+
+#endif
+
+#endif