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>

diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index fd6fae4..9a699e4 100644 (file)
--- 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 (file)
index 0000000..a1fb8fe
--- /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 9ccea4c..65245db 100644 (file)
--- 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 a25faf6..9c846fa 100644 (file)
--- 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 4c97ad0..31ebdef 100644 (file)
--- 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 (file)
index 0000000..d97cb6d
--- /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");