hwmon: pmbus: mpq8785: Add support for MPM3695 family

Add support for the Monolithic Power Systems MPM3695 family.
It contains four devices with suffixes: -10, -20, -25 and -100.
The device is PMBus compliant and shares characteristics with the
MPM82504.

MPM3695-25 has different VOLTAGE_SCALE_LOOP register size [11:0]
and therefore needs to have a separate compatible entry.

Tested with device tree based matching (MPM3695-10).

Signed-off-by: Pawel Dembicki <paweldembicki@gmail.com>
Link: https://lore.kernel.org/r/20250511035701.2607947-6-paweldembicki@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

2 files changed, 18 insertions, 5 deletions

diff --git a/Documentation/hwmon/mpq8785.rst b/Documentation/hwmon/mpq8785.rst
index b91fefb1a84c..198d5dfd7c30 100644
--- a/Documentation/hwmon/mpq8785.rst
+++ b/Documentation/hwmon/mpq8785.rst
@@ -5,6 +5,7 @@ Kernel driver mpq8785
 
 Supported chips:
 
+  * MPS MPM3695 family
   * MPS MPM82504
   * MPS MPQ8785
 
@@ -15,6 +16,14 @@ Author: Charles Hsu <ythsu0511@gmail.com>
 Description
 -----------
 
+The MPM3695 family is a scalable, ultra-thin, fully integrated power module with
+a PMBus interface. It offers a complete power solution that achieves up to
+10A (-10 variant), 20A (-25 variant), 25A (-20 variant), 100A (-100 variant)
+of output current with excellent load and line regulation across a wide input
+voltage range. It operates at high efficiency over a wide load range, and can
+be parallled to deliver higher current. Variants -10,-20 and -100 have different
+voltage scale configuration register range (10 bits) than -25 version (11 bits).
+
 The MPM82504 is a quad 25A, scalable, fully integrated power module with a PMBus
 interface. The device offers a complete power solution that achieves up to 25A
 per output channel. The MPM82504 has four output channels that can be paralleled
@@ -42,10 +51,6 @@ Fully integrated protection features include over-current protection (OCP),
 over-voltage protection (OVP), under-voltage protection (UVP), and
 over-temperature protection (OTP).
 
-All supported modules require a minimal number of readily available, standard
-external components. The MPM82504 is available in a BGA (15mmx30mmx5.18mm)
-package and the MPQ8785 is available in a TLGA (5mmx6mm) package.
-
 Device compliant with:
 
 - PMBus rev 1.3 interface.
diff --git a/drivers/hwmon/pmbus/mpq8785.c b/drivers/hwmon/pmbus/mpq8785.c
index 8827d5a57310..1f56aaf4dde8 100644
--- a/drivers/hwmon/pmbus/mpq8785.c
+++ b/drivers/hwmon/pmbus/mpq8785.c
@@ -12,9 +12,11 @@
 
 #define MPM82504_READ_TEMPERATURE_1_SIGN_POS	9
 
-enum chips { mpm82504, mpq8785 };
+enum chips { mpm3695, mpm3695_25, mpm82504, mpq8785 };
 
 static u16 voltage_scale_loop_max_val[] = {
+	[mpm3695] = GENMASK(9, 0),
+	[mpm3695_25] = GENMASK(11, 0),
 	[mpm82504] = GENMASK(9, 0),
 	[mpq8785] = GENMASK(10, 0),
 };
@@ -81,6 +83,8 @@ static struct pmbus_driver_info mpq8785_info = {
 };
 
 static const struct i2c_device_id mpq8785_id[] = {
+	{ "mpm3695", mpm3695 },
+	{ "mpm3695-25", mpm3695_25 },
 	{ "mpm82504", mpm82504 },
 	{ "mpq8785", mpq8785 },
 	{ },
@@ -88,6 +92,8 @@ static const struct i2c_device_id mpq8785_id[] = {
 MODULE_DEVICE_TABLE(i2c, mpq8785_id);
 
 static const struct of_device_id __maybe_unused mpq8785_of_match[] = {
+	{ .compatible = "mps,mpm3695", .data = (void *)mpm3695 },
+	{ .compatible = "mps,mpm3695-25", .data = (void *)mpm3695_25 },
 	{ .compatible = "mps,mpm82504", .data = (void *)mpm82504 },
 	{ .compatible = "mps,mpq8785", .data = (void *)mpq8785 },
 	{}
@@ -112,6 +118,8 @@ static int mpq8785_probe(struct i2c_client *client)
 		chip_id = (kernel_ulong_t)i2c_get_match_data(client);
 
 	switch (chip_id) {
+	case mpm3695:
+	case mpm3695_25:
 	case mpm82504:
 		info->format[PSC_VOLTAGE_OUT] = direct;
 		info->m[PSC_VOLTAGE_OUT] = 8;