github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-28 00:53:34 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

hwmon: pmbus: mpq8785: Implement VOUT feedback resistor divider ratio configuration

Browse Source 
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: Pawel Dembicki <paweldembicki@gmail.com>
Link: https://lore.kernel.org/r/20250511035701.2607947-4-paweldembicki@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Pawel Dembicki 2025-05-11 05:55:46 +02:00 committed by Guenter Roeck
parent 1bc6020dc4
commit dc1a4bab48
1 changed files with 18 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
drivers/hwmon/pmbus/mpq8785.c
View File

@ -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);
};