diff options
| author | Pawel Dembicki <paweldembicki@gmail.com> | 2025-05-11 06:55:46 +0300 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2025-05-12 19:43:17 +0300 |
| commit | dc1a4bab48d513e426118e42b9c371d942ddb04b (patch) | |
| tree | 7a61e0d6de427e40835dee142b86ef9fa5f2aa29 | |
| parent | 1bc6020dc400ea8290a7b26aa4365d4568e23e27 (diff) | |
| download | linux-dc1a4bab48d513e426118e42b9c371d942ddb04b.tar.xz | |
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: 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>
| -rw-r--r-- | drivers/hwmon/pmbus/mpq8785.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/hwmon/pmbus/mpq8785.c b/drivers/hwmon/pmbus/mpq8785.c index d0ac294b4bbc..2e7c0d0c3f81 100644 --- a/drivers/hwmon/pmbus/mpq8785.c +++ b/drivers/hwmon/pmbus/mpq8785.c @@ -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); }; |