Commit dc1a4bab authored by Pawel Dembicki's avatar Pawel Dembicki Committed by Guenter Roeck
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hwmon: pmbus: mpq8785: Implement VOUT feedback resistor divider ratio configuration 



Implement support for setting the VOUT_SCALE_LOOP PMBus register
based on an optional device tree property
"mps,vout-fb-divider-ratio-permille".

This allows the driver to provide the correct VOUT value depending
on the feedback voltage divider configuration for chips where the
bootloader does not configure the VOUT_SCALE_LOOP register.

Signed-off-by: default avatarPawel Dembicki <paweldembicki@gmail.com>
Link: https://lore.kernel.org/r/20250511035701.2607947-4-paweldembicki@gmail.com


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 1bc6020d

drivers/hwmon/pmbus/mpq8785.c

+18 −0
Original line number Diff line number Diff line
@@ -5,11 +5,16 @@ 


#include <linux/i2c.h>

#include <linux/module.h>

#include <linux/property.h>

#include <linux/of_device.h>

#include "pmbus.h"



enum chips { mpq8785 };



static u16 voltage_scale_loop_max_val[] = {

	[mpq8785] = GENMASK(10, 0),

};



static int mpq8785_identify(struct i2c_client *client,

			    struct pmbus_driver_info *info)

{
@@ -74,6 +79,8 @@ static int mpq8785_probe(struct i2c_client *client) 
	struct device *dev = &client->dev;

	struct pmbus_driver_info *info;

	enum chips chip_id;

	u32 voltage_scale;

	int ret;



	info = devm_kmemdup(dev, &mpq8785_info, sizeof(*info), GFP_KERNEL);

	if (!info)
@@ -92,6 +99,17 @@ static int mpq8785_probe(struct i2c_client *client) 
		return -ENODEV;

	}



	if (!device_property_read_u32(dev, "mps,vout-fb-divider-ratio-permille",

				      &voltage_scale)) {

		if (voltage_scale > voltage_scale_loop_max_val[chip_id])

			return -EINVAL;



		ret = i2c_smbus_write_word_data(client, PMBUS_VOUT_SCALE_LOOP,

						voltage_scale);

		if (ret)

			return ret;

	}



	return pmbus_do_probe(client, info);

};