From: Henry Wu <redacted>

Add support for the mp2869a and mp29612a controllers from Monolithic Power
Systems, Inc. (MPS). These are dual-loop, digital, multi-phase modulation
controllers.

Signed-off-by: Henry Wu <redacted>
---
  Documentation/hwmon/index.rst   |   1 +
  Documentation/hwmon/mp2869a.rst |  86 +++++++++
  drivers/hwmon/pmbus/Kconfig     |  10 ++
  drivers/hwmon/pmbus/Makefile    |   1 +
  drivers/hwmon/pmbus/mp2869a.c   | 299 ++++++++++++++++++++++++++++++++
  5 files changed, 397 insertions(+)
  create mode 100644 Documentation/hwmon/mp2869a.rst
  create mode 100644 drivers/hwmon/pmbus/mp2869a.c

diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index b45bfb4ebf30..10bf4bd77f7b 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst

@@ -172,6 +172,7 @@ Hardware Monitoring Kernel Drivers
     menf21bmc
     mlxreg-fan
     mp2856
+   mp2869a
     mp2888
     mp2891
     mp2975

diff --git a/Documentation/hwmon/mp2869a.rst b/Documentation/hwmon/mp2869a.rst
new file mode 100644
index 000000000000..a98ccb3d630d
--- /dev/null
+++ b/Documentation/hwmon/mp2869a.rst

@@ -0,0 +1,86 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver mp2896a
+=====================
+
+Supported chips:
+
+  * MPS MP2896A
+
+    Prefix: 'mp2896a'
+
+  * MPS MP29612A
+
+    Prefix: 'mp29612a'
+
+Author:
+
+    Henry Wu <Henry_WU@quantatw.com>
+
+Description
+-----------
+
+This driver implements support for Monolithic Power Systems, Inc. (MPS)
+MP2896A, a digital, multi-phase voltage regulator controller with PMBus interface.
+
+This device:
+
+- Supports up to two power rails.
+- Supports multiple PMBus pages for telemetry and configuration.
+- Supports VOUT readout in **VID format only** (no support for direct format).
+- Supports AMD SVI3 VID protocol with 5-mV/LSB resolution (if applicable).
+- Uses vendor-specific registers for VOUT scaling and phase configuration.
+
+Device supports:
+
+- SVID interface.
+- AVSBus interface.
+
+Device compliant with:
+
+- PMBus rev 1.3 interface.
+
+Sysfs Interface
+---------------
+
+The driver provides the following sysfs attributes:
+
+**Current measurements:**
+
+- Index 1: "iin"
+- Indexes 2, 3: "iout"
+
+**curr[1-3]_alarm**
+**curr[1-3]_input**
+**curr[1-3]_label**
+
+**Voltage measurements:**
+
+- Index 1: "vin"
+- Indexes 2, 3: "vout"
+
+**in[1-3]_crit**
+**in[1-3]_crit_alarm**
+**in[1-3]_input**
+**in[1-3]_label**
+**in[1-3]_lcrit**
+**in[1-3]_lcrit_alarm**
+
+**Power measurements:**
+
+- Index 1: "pin"
+- Indexes 2, 3: "pout"
+
+**power[1-3]_alarm**
+**power[1-3]_input**
+**power[1-3]_label**
+
+**Temperature measurements:**
+
+**temp[1-2]_crit**
+**temp[1-2]_crit_alarm**
+**temp[1-2]_input**
+**temp[1-2]_max**
+**temp[1-2]_max_alarm**
+
+

diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index 441f984a859d..93b558761cc6 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig

@@ -364,6 +364,16 @@ config SENSORS_MP2856
  	  This driver can also be built as a module. If so, the module will
  	  be called mp2856.
  
+config SENSORS_MP2869A
+	tristate "MP2869A PMBus sensor"
+	depends on I2C && PMBUS
+	help
+	  If you say yes here you get support for the MPS MP2869A MP29612A
+	  voltage regulator via the PMBus interface.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called mp2869a.
+
  config SENSORS_MP2888
  	tristate "MPS MP2888"
  	help

diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 29cd8a3317d2..42087d0dedbc 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile

@@ -37,6 +37,7 @@ obj-$(CONFIG_SENSORS_MAX31785)	+= max31785.o
  obj-$(CONFIG_SENSORS_MAX34440)	+= max34440.o
  obj-$(CONFIG_SENSORS_MAX8688)	+= max8688.o
  obj-$(CONFIG_SENSORS_MP2856)	+= mp2856.o
+obj-$(CONFIG_SENSORS_MP2869A)   += mp2869a.o
  obj-$(CONFIG_SENSORS_MP2888)	+= mp2888.o
  obj-$(CONFIG_SENSORS_MP2891)	+= mp2891.o
  obj-$(CONFIG_SENSORS_MP2975)	+= mp2975.o

diff --git a/drivers/hwmon/pmbus/mp2869a.c b/drivers/hwmon/pmbus/mp2869a.c
new file mode 100644
index 000000000000..e61f1380dbc1
--- /dev/null
+++ b/drivers/hwmon/pmbus/mp2869a.c

@@ -0,0 +1,299 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Hardware monitoring driver for MP2856A/MP29612A
+ * Monolithic Power Systems VR Controller
+ *
+ * Copyright (C) 2023 Quanta Computer lnc.
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pmbus.h>
+#include "pmbus.h"
+
+/* Vendor specific registers. */
+#define MP2869A_VOUT_MODE			 0x20