linux-kernel - [PATCH] hwmon: pmbus: mpq8785: add support for MPQ8786

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Message-Id: <20260203-hwmon-pmbus-mpq8785-add-support-for-mpq8786-v1-1-9ff8c7c50242@amd.com>
Date: Tue, 03 Feb 2026 16:42:58 +0800
From: Carl Lee via B4 Relay <devnull+carl.lee.amd.com@...nel.org>
To: Guenter Roeck <linux@...ck-us.net>
Cc: linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org, 
 carl.lee@....com, peter.shen@....com, colin.huang2@....com
Subject: [PATCH] hwmon: pmbus: mpq8785: add support for MPQ8786

From: Carl Lee <carl.lee@....com>

Add support for the Monolithic Power Systems MPQ8786 digital voltage
regulator.

Signed-off-by: Carl Lee <carl.lee@....com>
---
 Documentation/hwmon/mpq8785.rst | 7 +++++++
 drivers/hwmon/pmbus/mpq8785.c   | 6 +++++-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/Documentation/hwmon/mpq8785.rst b/Documentation/hwmon/mpq8785.rst
index 198d5dfd7c30..39306033990f 100644
--- a/Documentation/hwmon/mpq8785.rst
+++ b/Documentation/hwmon/mpq8785.rst
@@ -8,6 +8,7 @@ Supported chips:
   * MPS MPM3695 family
   * MPS MPM82504
   * MPS MPQ8785
+  * MPS MPQ8786
 
     Prefix: 'mpq8785'
 
@@ -38,6 +39,12 @@ buck converter. The MPQ8785 offers a very compact solution that achieves up to
 wide input supply range. The MPQ8785 operates at high efficiency over a wide
 output current load range.
 
+The MPQ8786 is a fully integrated, PMBus-compatible, high-frequency, synchronous
+buck converter. The device shares the same PMBus interface and register behavior
+as the MPQ8785, but provides a lower output current capability of up to 25A per
+phase. It offers excellent load and line regulation over a wide input supply
+range and operates at high efficiency over a wide output current load range.
+
 The PMBus interface provides converter configurations and key parameters
 monitoring.
 
diff --git a/drivers/hwmon/pmbus/mpq8785.c b/drivers/hwmon/pmbus/mpq8785.c
index 1f56aaf4dde8..f35534836cb8 100644
--- a/drivers/hwmon/pmbus/mpq8785.c
+++ b/drivers/hwmon/pmbus/mpq8785.c
@@ -12,13 +12,14 @@
 
 #define MPM82504_READ_TEMPERATURE_1_SIGN_POS	9
 
-enum chips { mpm3695, mpm3695_25, mpm82504, mpq8785 };
+enum chips { mpm3695, mpm3695_25, mpm82504, mpq8785, mpq8786 };
 
 static u16 voltage_scale_loop_max_val[] = {
 	[mpm3695] = GENMASK(9, 0),
 	[mpm3695_25] = GENMASK(11, 0),
 	[mpm82504] = GENMASK(9, 0),
 	[mpq8785] = GENMASK(10, 0),
+	[mpq8786] = GENMASK(10, 0),
 };
 
 static int mpq8785_identify(struct i2c_client *client,
@@ -87,6 +88,7 @@ static const struct i2c_device_id mpq8785_id[] = {
 	{ "mpm3695-25", mpm3695_25 },
 	{ "mpm82504", mpm82504 },
 	{ "mpq8785", mpq8785 },
+	{ "mpq8786", mpq8786 },
 	{ },
 };
 MODULE_DEVICE_TABLE(i2c, mpq8785_id);
@@ -96,6 +98,7 @@ static const struct of_device_id __maybe_unused mpq8785_of_match[] = {
 	{ .compatible = "mps,mpm3695-25", .data = (void *)mpm3695_25 },
 	{ .compatible = "mps,mpm82504", .data = (void *)mpm82504 },
 	{ .compatible = "mps,mpq8785", .data = (void *)mpq8785 },
+	{ .compatible = "mps,mpq8786", .data = (void *)mpq8786 },
 	{}
 };
 MODULE_DEVICE_TABLE(of, mpq8785_of_match);
@@ -128,6 +131,7 @@ static int mpq8785_probe(struct i2c_client *client)
 		info->read_word_data = mpm82504_read_word_data;
 		break;
 	case mpq8785:
+	case mpq8786:
 		info->identify = mpq8785_identify;
 		break;
 	default:

---
base-commit: 4c87cdd0328495759f6e9f9f4e1e53ef8032a76f
change-id: 20260203-hwmon-pmbus-mpq8785-add-support-for-mpq8786-5e73c796bf13

Best regards,
-- 
Carl Lee <carl.lee@....com>