From 7537862a90b8b9106d42ad2f53de2b96fd1673c5 Mon Sep 17 00:00:00 2001
From: Charles <hsu.yungteng@gmail.com>
Date: Wed, 2 Dec 2020 14:11:04 +0800
Subject: [PATCH] hwmon: Add driver for STMicroelectronics PM6764 Voltage
Regulator
Add the pmbus driver for the STMicroelectronics pm6764 voltage regulator.
the output voltage use the MFR_READ_VOUT 0xD4
vout value returned is linear11
Signed-off-by: Charles Hsu <hsu.yungteng@gmail.com>
[groeck: Fixed various compile errors; marked pm6764tr_of_match __maybe_unused]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
---
Documentation/hwmon/index.rst | 1 +
Documentation/hwmon/pm6764tr.rst | 32 ++++++++++++++
MAINTAINERS | 7 +++
drivers/hwmon/pmbus/Kconfig | 9 ++++
drivers/hwmon/pmbus/Makefile | 1 +
drivers/hwmon/pmbus/pm6764tr.c | 75 ++++++++++++++++++++++++++++++++
6 files changed, 125 insertions(+)
create mode 100644 Documentation/hwmon/pm6764tr.rst
create mode 100644 drivers/hwmon/pmbus/pm6764tr.c
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index fd6fae46b99cb..9a699e4f0234f 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -146,6 +146,7 @@ Hardware Monitoring Kernel Drivers
pc87360
pc87427
pcf8591
+ pm6764tr
pmbus
powr1220
pxe1610
diff --git a/Documentation/hwmon/pm6764tr.rst b/Documentation/hwmon/pm6764tr.rst
new file mode 100644
index 0000000000000..a1fb8fea23267
--- /dev/null
+++ b/Documentation/hwmon/pm6764tr.rst
@@ -0,0 +1,32 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+Kernel driver pm6764tr
+======================
+
+Supported chips:
+
+ * ST PM6764TR
+
+ Prefix: 'pm6764tr'
+
+ Addresses scanned: -
+
+ Datasheet: http://www.st.com/resource/en/data_brief/pm6764.pdf
+
+Authors:
+ <hsu.yungteng@gmail.com>
+
+Description:
+------------
+
+This driver supports the STMicroelectronics PM6764TR chip. The PM6764TR is a high
+performance digital controller designed to power Intel’s VR12.5 processors and memories.
+
+The device utilizes digital technology to implement all control and power management
+functions to provide maximum flexibility and performance. The NVM is embedded to store
+custom configurations. The PM6764TR device features up to 4-phase programmable operation.
+
+The PM6764TR supports power state transitions featuring VFDE, and programmable DPM
+maintaining the best efficiency over all loading conditions without compromising transient
+response. The device assures fast and independent protection against load overcurrent,
+under/overvoltage and feedback disconnections.
diff --git a/MAINTAINERS b/MAINTAINERS
index 9ccea4c36b950..65245db064522 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13900,6 +13900,13 @@ M: Logan Gunthorpe <logang@deltatee.com>
S: Maintained
F: drivers/dma/plx_dma.c
+PM6764TR DRIVER
+M: Charles Hsu <hsu.yungteng@gmail.com>
+L: linux-hwmon@vger.kernel.org
+S: Maintained
+F: Documentation/hwmon/pm6764tr.rst
+F: drivers/hwmon/pmbus/pm6764tr.c
+
PM-GRAPH UTILITY
M: "Todd E Brandt" <todd.e.brandt@linux.intel.com>
L: linux-pm@vger.kernel.org
diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig
index a25faf69fce3d..9c846facce9f3 100644
--- a/drivers/hwmon/pmbus/Kconfig
+++ b/drivers/hwmon/pmbus/Kconfig
@@ -220,6 +220,15 @@ config SENSORS_MP2975
This driver can also be built as a module. If so, the module will
be called mp2975.
+config SENSORS_PM6764TR
+ tristate "ST PM6764TR"
+ help
+ If you say yes here you get hardware monitoring support for ST
+ PM6764TR.
+
+ This driver can also be built as a module. If so, the module will
+ be called pm6764tr.
+
config SENSORS_PXE1610
tristate "Infineon PXE1610"
help
diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile
index 4c97ad0bd7919..31ebdef5d4a6a 100644
--- a/drivers/hwmon/pmbus/Makefile
+++ b/drivers/hwmon/pmbus/Makefile
@@ -25,6 +25,7 @@ obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
+obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o
obj-$(CONFIG_SENSORS_PXE1610) += pxe1610.o
obj-$(CONFIG_SENSORS_TPS40422) += tps40422.o
obj-$(CONFIG_SENSORS_TPS53679) += tps53679.o
diff --git a/drivers/hwmon/pmbus/pm6764tr.c b/drivers/hwmon/pmbus/pm6764tr.c
new file mode 100644
index 0000000000000..d97cb6d6c87f6
--- /dev/null
+++ b/drivers/hwmon/pmbus/pm6764tr.c
@@ -0,0 +1,75 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for STMicroelectronics digital controller PM6764TR
+ */
+
+#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"
+
+#define PM6764TR_PMBUS_READ_VOUT 0xD4
+
+static int pm6764tr_read_word_data(struct i2c_client *client, int page, int phase, int reg)
+{
+ int ret;
+
+ switch (reg) {
+ case PMBUS_VIRT_READ_VMON:
+ ret = pmbus_read_word_data(client, page, phase, PM6764TR_PMBUS_READ_VOUT);
+ break;
+ default:
+ ret = -ENODATA;
+ break;
+ }
+ return ret;
+}
+
+static struct pmbus_driver_info pm6764tr_info = {
+ .pages = 1,
+ .format[PSC_VOLTAGE_IN] = linear,
+ .format[PSC_VOLTAGE_OUT] = vid,
+ .format[PSC_TEMPERATURE] = linear,
+ .format[PSC_CURRENT_OUT] = linear,
+ .format[PSC_POWER] = linear,
+ .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
+ PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | PMBUS_HAVE_VMON |
+ PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_VOUT |
+ PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+ .read_word_data = pm6764tr_read_word_data,
+};
+
+static int pm6764tr_probe(struct i2c_client *client)
+{
+ return pmbus_do_probe(client, &pm6764tr_info);
+}
+
+static const struct i2c_device_id pm6764tr_id[] = {
+ {"pm6764tr", 0},
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, pm6764tr_id);
+
+static const struct of_device_id __maybe_unused pm6764tr_of_match[] = {
+ {.compatible = "st,pm6764tr"},
+ {}
+};
+
+/* This is the driver that will be inserted */
+static struct i2c_driver pm6764tr_driver = {
+ .driver = {
+ .name = "pm6764tr",
+ .of_match_table = of_match_ptr(pm6764tr_of_match),
+ },
+ .probe_new = pm6764tr_probe,
+ .id_table = pm6764tr_id,
+};
+
+module_i2c_driver(pm6764tr_driver);
+
+MODULE_AUTHOR("Charles Hsu");
+MODULE_DESCRIPTION("PMBus driver for ST PM6764TR");
+MODULE_LICENSE("GPL");
--
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