ARM: shmobile: lager: Add DT reference

This is sufficient to allow boot of the Lager board with
a console without boards-lager.c compiled into the kernel.
This is an example of a minimal but still useful initialisation
of the board using DT as much as possible.

As such it is the same as the boot of Lager that can be achieved
without a board file. The intention of adding this file
is to facilitate further work to allow board specific devices to be
initialised via DT.

Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

6 files changed, 67 insertions, 2 deletions

diff --git a/arch/arm/mach-shmobile/Kconfig b/arch/arm/mach-shmobile/Kconfig
index 6b92ee43f160..3aeafc28fe97 100644
--- a/arch/arm/mach-shmobile/Kconfig
+++ b/arch/arm/mach-shmobile/Kconfig
@@ -148,6 +148,17 @@ config MACH_LAGER
 	depends on ARCH_R8A7790
 	select USE_OF
 
+config MACH_LAGER_REFERENCE
+	bool "Lager board - Reference Device Tree Implementation"
+	depends on ARCH_R8A7790
+	select USE_OF
+	---help---
+	   Use reference implementation of Lager board support
+	   which makes use of device tree at the expense
+	   of not supporting a number of devices.
+
+	   This is intended to aid developers
+
 config MACH_KZM9D
 	bool "KZM9D board"
 	depends on ARCH_EMEV2
diff --git a/arch/arm/mach-shmobile/Makefile b/arch/arm/mach-shmobile/Makefile
index 6165a517f580..d813133f7c56 100644
--- a/arch/arm/mach-shmobile/Makefile
+++ b/arch/arm/mach-shmobile/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_MACH_BOCKW)	+= board-bockw.o
 obj-$(CONFIG_MACH_MARZEN)	+= board-marzen.o
 obj-$(CONFIG_MACH_MARZEN_REFERENCE)	+= board-marzen-reference.o
 obj-$(CONFIG_MACH_LAGER)	+= board-lager.o
+obj-$(CONFIG_MACH_LAGER_REFERENCE)	+= board-lager-reference.o
 obj-$(CONFIG_MACH_ARMADILLO800EVA)	+= board-armadillo800eva.o
 obj-$(CONFIG_MACH_ARMADILLO800EVA_REFERENCE)	+= board-armadillo800eva-reference.o
 obj-$(CONFIG_MACH_KZM9D)	+= board-kzm9d.o
diff --git a/arch/arm/mach-shmobile/Makefile.boot b/arch/arm/mach-shmobile/Makefile.boot
index 84c6868580f0..16834d8e9748 100644
--- a/arch/arm/mach-shmobile/Makefile.boot
+++ b/arch/arm/mach-shmobile/Makefile.boot
@@ -10,6 +10,7 @@ loadaddr-$(CONFIG_MACH_KZM9D) += 0x40008000
 loadaddr-$(CONFIG_MACH_KZM9G) += 0x41008000
 loadaddr-$(CONFIG_MACH_KZM9G_REFERENCE) += 0x41008000
 loadaddr-$(CONFIG_MACH_LAGER) += 0x40008000
+loadaddr-$(CONFIG_MACH_LAGER_REFERENCE) += 0x40008000
 loadaddr-$(CONFIG_MACH_MACKEREL) += 0x40008000
 loadaddr-$(CONFIG_MACH_MARZEN) += 0x60008000
 loadaddr-$(CONFIG_MACH_MARZEN_REFERENCE) += 0x60008000
diff --git a/arch/arm/mach-shmobile/board-lager-reference.c b/arch/arm/mach-shmobile/board-lager-reference.c
new file mode 100644
index 000000000000..eb6c55e1334a
--- /dev/null
+++ b/arch/arm/mach-shmobile/board-lager-reference.c
@@ -0,0 +1,46 @@
+/*
+ * Lager board support - Reference DT implementation
+ *
+ * Copyright (C) 2013  Renesas Solutions Corp.
+ * Copyright (C) 2013  Simon Horman
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#include <linux/init.h>
+#include <linux/irqchip.h>
+#include <linux/of_platform.h>
+#include <mach/r8a7790.h>
+#include <asm/mach/arch.h>
+
+void __init lager_add_standard_devices(void)
+{
+	/* clocks are setup late during boot in the case of DT */
+	r8a7790_clock_init();
+
+	r8a7790_add_dt_devices();
+        of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
+}
+
+static const char *lager_boards_compat_dt[] __initdata = {
+	"renesas,lager-reference",
+	NULL,
+};
+
+DT_MACHINE_START(LAGER_DT, "lager")
+	.init_early	= r8a7790_init_delay,
+	.init_machine	= lager_add_standard_devices,
+	.init_time	= r8a7790_timer_init,
+	.dt_compat	= lager_boards_compat_dt,
+MACHINE_END
diff --git a/arch/arm/mach-shmobile/include/mach/r8a7790.h b/arch/arm/mach-shmobile/include/mach/r8a7790.h
index 7851cc1bc9fb..421d84202314 100644
--- a/arch/arm/mach-shmobile/include/mach/r8a7790.h
+++ b/arch/arm/mach-shmobile/include/mach/r8a7790.h
@@ -2,6 +2,7 @@
 #define __ASM_R8A7790_H__
 
 void r8a7790_add_standard_devices(void);
+void r8a7790_add_dt_devices(void);
 void r8a7790_clock_init(void);
 void r8a7790_pinmux_init(void);
 void r8a7790_init_delay(void);
diff --git a/arch/arm/mach-shmobile/setup-r8a7790.c b/arch/arm/mach-shmobile/setup-r8a7790.c
index f01542e13e58..7f01178e0ed2 100644
--- a/arch/arm/mach-shmobile/setup-r8a7790.c
+++ b/arch/arm/mach-shmobile/setup-r8a7790.c
@@ -179,7 +179,7 @@ static struct resource cmt00_resources[] = {
 					  &cmt##idx##_platform_data,	\
 					  sizeof(struct sh_timer_config))
 
-void __init r8a7790_add_standard_devices(void)
+void __init r8a7790_add_dt_devices(void)
 {
 	r8a7790_register_scif(SCIFA0);
 	r8a7790_register_scif(SCIFA1);
@@ -191,9 +191,14 @@ void __init r8a7790_add_standard_devices(void)
 	r8a7790_register_scif(SCIF1);
 	r8a7790_register_scif(HSCIF0);
 	r8a7790_register_scif(HSCIF1);
+	r8a7790_register_cmt(00);
+}
+
+void __init r8a7790_add_standard_devices(void)
+{
+	r8a7790_add_dt_devices();
 	r8a7790_register_irqc(0);
 	r8a7790_register_thermal();
-	r8a7790_register_cmt(00);
 }
 
 void __init r8a7790_timer_init(void)