Add driver for LT717x

Documentation/devicetree/bindings/trivial-devices.yaml

@@ -43,6 +43,14 @@ properties:
           - adi,adp5585-02
             # Analog Devices ADP5589 Keypad Decoder and I/O Expansion
           - adi,adp5589
+            # Analog Devices LT7170 20A, 16V Single- or Dual-Phase Step-Down Silent Switcher
+          - adi,lt7170
+            # Analog Devices LT7170-1 20A, 16V Single- or Dual-Phase Step-Down Silent Switcher
+          - adi,lt7170-1
+            # Analog Devices LT7171 20A, 16V PolyPhase Step-Down Silent Switcher
+          - adi,lt7171
+            #  Analog Devices LT7171-1 20A, 16V PolyPhase Step-Down Silent Switcher
+          - adi,lt7171-1
             # Analog Devices LT7182S Dual Channel 6A, 20V PolyPhase Step-Down Silent Switcher
           - adi,lt7182s
             # AMS iAQ-Core VOC Sensor

Documentation/hwmon/index.rst

@@ -115,6 +115,7 @@ Hardware Monitoring Kernel Drivers
    lm95234
    lm95245
    lochnagar
+   lt7170
    lt7182s
    ltc2992
    ltc2945

Documentation/hwmon/lt7170.rst

@@ -0,0 +1,110 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+Kernel driver lt7170
+=====================
+
+Supported chips:
+
+	* Analog Devices LT7170
+
+		Prefix: 'lt7170'
+
+		Addresses scanned: I2C 0x4F
+
+		Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/lt7170-lt7170-1.pdf
+
+	* Analog Devices LT7170-1
+
+		Prefix: 'lt7170-1'
+
+		Addresses scanned: I2C 0x4F
+
+		Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/lt7170-lt7170-1.pdf
+
+	* Analog Devices LT7171
+
+		Prefix: 'lt7171'
+
+		Addresses scanned: I2C 0x41
+
+		Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/lt7170-lt7170-1.pdf
+
+        * Analog Devices LT7171-1
+
+		Prefix: 'lt7171-1'
+
+		Addresses scanned: I2C 0x41
+
+		Datasheet: https://www.analog.com/media/en/technical-documentation/data-sheets/lt7170-lt7170-1.pdf
+
+
+Authors:
+		- Cherrence Sarip <[email protected]>
+
+
+Description
+-----------
+
+The LT7170 is a family of silent switcher step-down regulators with
+digital power system management support. LT7170
+features telemetry monitoring of input/output voltage, output current,
+and temperature over PMBus.
+
+The driver is a client driver to the core PMBus driver. Please see
+Documentation/hwmon/pmbus.rst for details on PMBus client drivers.
+
+Usage Notes
+-----------
+
+This driver does not auto-detect devices. You will have to instantiate the
+devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
+details.
+
+Platform data support
+---------------------
+
+The driver supports standard PMBus driver platform data. Please see
+Documentation/hwmon/pmbus.rst for details.
+
+Sysfs Attributes
+----------------
+
+======================= ===========================
+curr1_label		"iout1"
+curr1_input		Measured output current
+curr1_highest		Highest measured output current
+curr1_max		Maximum output current
+curr1_max_alarm		Output current high alarm
+
+in1_label		"vin"
+in1_input		Measured input voltage
+in1_highest		Highest measured input voltage
+in1_min			Minimum input voltage
+in1_min_alarm		Input voltage low alarm
+in1_rated_min		Rated minimum input voltage
+in1_rated_max		Rated maximum input voltage
+in1_reset_history	Write to reset history for all attributes
+
+in2_label		"vout1"
+in2_input		Measured output voltage
+in2_highest		Highest measured output voltage
+in2_lcrit		Critical minimum output voltage
+in2_lcrit_alarm		Output voltage critical low alarm
+in2_min			Minimum output voltage
+in2_max_alarm		Output voltage low alarm
+in2_max			Maximum output voltage
+in2_max_alarm		Output voltage high alarm
+in2_crit		Critical maximum output voltage
+in2_crit_alarm		Output voltage critical high alarm
+in2_rated_min		Rated minimum output voltage
+in2_rated_max		Rated maximum output voltage
+
+temp1_input		Measured temperature
+temp1_highest		Highest measured temperature
+temp1_crit		Critical high temperature
+temp1_crit_alarm	Chip temperature critical high alarm
+temp1_max		Maximum temperature
+temp1_max_alarm		Chip temperature high alarm
+======================= ===========================
+
+

MAINTAINERS

@@ -12549,6 +12549,13 @@ L:	[email protected]
 S:	Maintained
 F:	drivers/scsi/sym53c8xx_2/
 
+LT7170 HARDWARE MONITOR DRIVER
+M:	Cherrence Sarip <[email protected]>
+L:	[email protected]
+S:	Supported
+F:	Documentation/hwmon/lt7170.rst
+F:	drivers/hwmon/pmbus/lt7170.c
+
 LTC1660 DAC DRIVER
 M:	Marcus Folkesson <[email protected]>
 L:	[email protected]

drivers/hwmon/Kconfig.adi

@@ -26,6 +26,7 @@ config HWMON_ALL_ADI_DRIVERS
 	imply SENSORS_ADT7462
 	imply SENSORS_ADT7470
 	imply SENSORS_ADT7475
+	imply SENSORS_LT7170
 	imply SENSORS_LTC2945
 	imply SENSORS_LTC2947_I2C
 	imply SENSORS_LTC2947_SPI

drivers/hwmon/pmbus/Kconfig

@@ -200,6 +200,15 @@ config SENSORS_LM25066_REGULATOR
 	  If you say yes here you get regulator support for National
 	  Semiconductor LM25066, LM5064, and LM5066.
 
+config SENSORS_LT7170
+	tristate "Analog Devices LT7170, LT7170-1, LT7171, LT7171-1"
+	help
+	  If you say yes here you get hardware monitoring support for Analog
+	  Devices LT7170, LT7170-1, LT7171 and LT7171-1.
+
+	  This driver can also be built as a module. If so, the module will
+	  be called lt7170.
+
 config SENSORS_LT7182S
 	tristate "Analog Devices LT7182S"
 	help

drivers/hwmon/pmbus/Makefile

@@ -22,6 +22,7 @@ obj-$(CONFIG_SENSORS_IR38064)	+= ir38064.o
 obj-$(CONFIG_SENSORS_IRPS5401)	+= irps5401.o
 obj-$(CONFIG_SENSORS_ISL68137)	+= isl68137.o
 obj-$(CONFIG_SENSORS_LM25066)	+= lm25066.o
+obj-$(CONFIG_SENSORS_LT7170)	+= lt7170.o
 obj-$(CONFIG_SENSORS_LT7182S)	+= lt7182s.o
 obj-$(CONFIG_SENSORS_LTC2978)	+= ltc2978.o
 obj-$(CONFIG_SENSORS_LTC3815)	+= ltc3815.o

drivers/hwmon/pmbus/lt7170.c

@@ -0,0 +1,154 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Hardware monitoring driver for Analog Devices LT7170
+ *
+ * Copyright (C) 2024 Analog Devices, Inc.
+ */
+#include <linux/bits.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include "pmbus.h"
+
+#define LT7170_NUM_PAGES	1
+
+#define MFR_READ_EXTVCC		0xcd
+#define MFR_READ_ITH		0xce
+#define MFR_CONFIG_ALL_LT7170	0xd1
+#define MFR_IOUT_PEAK		0xd7
+#define MFR_ADC_CONTROL_LT7170 0xd8
+
+#define MFR_DEBUG_TELEMETRY	BIT(0)
+
+#define MFR_VOUT_PEAK		0xdd
+#define MFR_VIN_PEAK		0xde
+#define MFR_TEMPERATURE_1_PEAK	0xdf
+#define MFR_CLEAR_PEAKS		0xe3
+
+static int lt7170_read_word_data(struct i2c_client *client, int page, int phase, int reg)
+{
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_READ_VMON:
+		if (page == 0)
+			ret = pmbus_read_word_data(client, page, phase, MFR_READ_ITH);
+		else
+			ret = pmbus_read_word_data(client, 0, phase, MFR_READ_EXTVCC);
+		break;
+	case PMBUS_VIRT_READ_IOUT_MAX:
+		ret = pmbus_read_word_data(client, page, phase, MFR_IOUT_PEAK);
+		break;
+	case PMBUS_VIRT_READ_VOUT_MAX:
+		ret = pmbus_read_word_data(client, page, phase, MFR_VOUT_PEAK);
+		break;
+	case PMBUS_VIRT_READ_VIN_MAX:
+		ret = pmbus_read_word_data(client, page, phase, MFR_VIN_PEAK);
+		break;
+	case PMBUS_VIRT_READ_TEMP_MAX:
+		ret = pmbus_read_word_data(client, page, phase, MFR_TEMPERATURE_1_PEAK);
+		break;
+	case PMBUS_VIRT_RESET_VIN_HISTORY:
+		ret = (page == 0) ? 0 : -ENODATA;
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static int lt7170_write_word_data(struct i2c_client *client, int page, int reg, u16 word)
+{
+	int ret;
+
+	switch (reg) {
+	case PMBUS_VIRT_RESET_VIN_HISTORY:
+		ret = pmbus_write_byte(client, 0, MFR_CLEAR_PEAKS);
+		break;
+	default:
+		ret = -ENODATA;
+		break;
+	}
+	return ret;
+}
+
+static struct pmbus_driver_info lt7170_info = {
+	.pages = LT7170_NUM_PAGES,
+	.format[PSC_VOLTAGE_IN] = ieee754,
+	.format[PSC_VOLTAGE_OUT] = ieee754,
+	.format[PSC_CURRENT_OUT] = ieee754,
+	.format[PSC_TEMPERATURE] = ieee754,
+	.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT |
+	  PMBUS_HAVE_IOUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_VOUT |
+	  PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_STATUS_INPUT |
+	  PMBUS_HAVE_STATUS_TEMP,
+	.read_word_data = lt7170_read_word_data,
+	.write_word_data = lt7170_write_word_data,
+};
+
+static int lt7170_probe(struct i2c_client *client)
+{
+	struct device *dev = &client->dev;
+	struct pmbus_driver_info *info;
+	int ret;
+
+	if (!i2c_check_functionality(client->adapter,
+				     I2C_FUNC_SMBUS_READ_BYTE_DATA |
+				     I2C_FUNC_SMBUS_READ_WORD_DATA |
+				     I2C_FUNC_SMBUS_READ_BLOCK_DATA))
+		return -ENODEV;
+
+	info = devm_kmemdup(dev, &lt7170_info,
+			    sizeof(struct pmbus_driver_info), GFP_KERNEL);
+	if (!info)
+		return -ENOMEM;
+
+	/* Enable VMON output if configured */
+	ret = i2c_smbus_read_byte_data(client, MFR_ADC_CONTROL_LT7170);
+	if (ret < 0)
+		return ret;
+	if (ret & MFR_DEBUG_TELEMETRY) {
+		info->pages = 1;
+		info->func[0] |= PMBUS_HAVE_VMON;
+	}
+
+	return pmbus_do_probe(client, &lt7170_info);
+}
+
+static const struct i2c_device_id lt7170_id[] = {
+	{"lt7170", 0},
+	{"lt7170-1", 0},
+	{"lt7171", 0},
+	{"lt7171-1", 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, lt7170_id);
+
+static const struct of_device_id lt7170_of_match[] = {
+	{ .compatible = "adi,lt7170" },
+	{ .compatible = "adi,lt7170-1" },
+	{ .compatible = "adi,lt7171" },
+	{ .compatible = "adi,lt7171-1" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, lt7170_of_match);
+
+static struct i2c_driver lt7170_driver = {
+	.driver = {
+	.name = "lt7170",
+	.of_match_table = of_match_ptr(lt7170_of_match),
+	},
+	.probe = lt7170_probe,
+	.id_table = lt7170_id,
+};
+
+module_i2c_driver(lt7170_driver);
+
+MODULE_AUTHOR("Cherrence Sarip <[email protected]>");
+MODULE_DESCRIPTION("PMBus driver for Analog Devices LT7170");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PMBUS);