On 6/30/25 04:20, tzuhao.wtmh@xxxxxxxxx wrote:
From: Henry Wu <Henry_Wu@xxxxxxxxxxxx>
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 <Henry_Wu@xxxxxxxxxxxx>
---
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@xxxxxxxxxxxx>
+
+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
Standard register.
+#define MP2869A_VOUT_MODE_MASK GENMASK(7, 5)
+#define MP2869A_VOUT_MODE_VID (0 << 5)
+
+#define MP2869A_READ_VOUT 0x8b
Standard register.
+
+#define MP2869A_MFR_VOUT_SCALE_LOOP 0x29
Standard register.
Guenter
