hwmon: (pmbus) Add driver for the TEXAS TPS546D24 Buck Converter.

Add the pmbus driver for TEXAS tps546d24 Buck Converter.
The vout mode of tps546d24 supported relative data format,
which is not supported by the PMBus core.

Signed-off-by: Duke Du <dukedu83@gmail.com>
Link: https://lore.kernel.org/r/1662951668-9849-1-git-send-email-Duke.Du@quantatw.com
[groeck: Add __maybe_unused to tps546d24_of_match declaration]
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

Documentation/hwmon/index.rst

@@ -206,6 +206,7 @@ Hardware Monitoring Kernel Drivers
    tps23861
    tps40422
    tps53679
+   tps546d24
    twl4030-madc-hwmon
    ucd9000
    ucd9200

Documentation/hwmon/tps546d24.rst

@@ -0,0 +1,35 @@
+.. SPDX-License-Identifier: GPL-2.0-only
+
+Kernel driver tps546d24
+=======================
+
+Supported chips:
+
+  * TI TPS546D24
+
+    Prefix: 'tps546d24'
+
+    Addresses scanned: -
+
+    Datasheet: https://www.ti.com/lit/gpn/tps546d24
+
+Author: Duke Du <dukedu83@gmail.com>
+
+
+Description
+-----------
+
+The TPS546D24A is a highly integrated, non-isolated DC/DC converter capable
+of high frequency operation and 40-A current output from a 7-mm x 5-mm
+package.
+
+Two, three, and four TPS546D24A devices can be interconnected
+to provide up to 160 A on a single output. The device has an option to
+overdrive the internal 5-V LDO with an external 5-V supply via the VDD5
+pin to improve efficiency and reduce power dissipation of the converter.
+
+
+Platform data support
+---------------------
+
+The driver supports standard PMBus driver platform data.

MAINTAINERS

@@ -20611,6 +20611,13 @@ Q:	https://patchwork.kernel.org/project/linux-integrity/list/
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git
 F:	drivers/char/tpm/
 
+TPS546D24 DRIVER
+M:	Duke Du <dukedu83@gmail.com>
+L:	linux-hwmon@vger.kernel.org
+S:	Maintained
+F:	Documentation/hwmon/tps546d24.rst
+F:	drivers/hwmon/pmbus/tps546d24.c
+
 TRACING
 M:	Steven Rostedt <rostedt@goodmis.org>
 M:	Ingo Molnar <mingo@redhat.com>

drivers/hwmon/pmbus/Kconfig

@@ -397,6 +397,15 @@ config SENSORS_TPS53679
 	  This driver can also be built as a module. If so, the module will
 	  be called tps53679.
 
+config SENSORS_TPS546D24
+	tristate "TPS546D24"
+	help
+	  If you say yes here you get hardware monitoring support for TEXAS
+	  TPS546D24.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called tps546d24
+
 config SENSORS_UCD9000
 	tristate "TI UCD90120, UCD90124, UCD90160, UCD90320, UCD9090, UCD90910"
 	help

drivers/hwmon/pmbus/Makefile

@@ -41,6 +41,7 @@ obj-$(CONFIG_SENSORS_Q54SJ108A2)	+= q54sj108a2.o
 obj-$(CONFIG_SENSORS_STPDDC60)	+= stpddc60.o
 obj-$(CONFIG_SENSORS_TPS40422)	+= tps40422.o
 obj-$(CONFIG_SENSORS_TPS53679)	+= tps53679.o
+obj-$(CONFIG_SENSORS_TPS546D24)	+= tps546d24.o
 obj-$(CONFIG_SENSORS_UCD9000)	+= ucd9000.o
 obj-$(CONFIG_SENSORS_UCD9200)	+= ucd9200.o
 obj-$(CONFIG_SENSORS_XDPE122)	+= xdpe12284.o

drivers/hwmon/pmbus/tps546d24.c

@@ -0,0 +1,71 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Hardware monitoring driver for TEXAS TPS546D24 buck converter
+ */
+
+#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"
+
+static struct pmbus_driver_info tps546d24_info = {
+	.pages = 1,
+	.format[PSC_VOLTAGE_IN] = linear,
+	.format[PSC_VOLTAGE_OUT] = linear,
+	.format[PSC_TEMPERATURE] = linear,
+	.format[PSC_CURRENT_OUT] = linear,
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
+			| PMBUS_HAVE_IOUT | PMBUS_HAVE_VOUT
+			| PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_VOUT
+			| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP,
+};
+
+static int tps546d24_probe(struct i2c_client *client)
+{
+	int reg;
+
+	reg = i2c_smbus_read_byte_data(client, PMBUS_VOUT_MODE);
+	if (reg < 0)
+		return reg;
+
+	if (reg & 0x80) {
+		int err;
+
+		err = i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE, reg & 0x7f);
+		if (err < 0)
+			return err;
+	}
+	return pmbus_do_probe(client, &tps546d24_info);
+}
+
+static const struct i2c_device_id tps546d24_id[] = {
+	{"tps546d24", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, tps546d24_id);
+
+static const struct of_device_id __maybe_unused tps546d24_of_match[] = {
+	{.compatible = "ti,tps546d24"},
+	{}
+};
+MODULE_DEVICE_TABLE(of, tps546d24_of_match);
+
+/* This is the driver that will be inserted */
+static struct i2c_driver tps546d24_driver = {
+	.driver = {
+		   .name = "tps546d24",
+		   .of_match_table = of_match_ptr(tps546d24_of_match),
+	   },
+	.probe_new = tps546d24_probe,
+	.id_table = tps546d24_id,
+};
+
+module_i2c_driver(tps546d24_driver);
+
+MODULE_AUTHOR("Duke Du <dukedu83@gmail.com>");
+MODULE_DESCRIPTION("PMBus driver for TI tps546d24");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);