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hwmon: (pmbus/lm25066) add current limit configuration support

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Add support for the 'ti,current-range' devicetree property to configure
the current limit via the DEVICE_SETUP (0xD9) register, overriding the
physical CL pin setting.

This configuration is supported on all chips in this driver (LM25066,
LM5064, LM5066, LM5066i) except LM25056.

The property values "low" and "high" map to:
- LM25066: low = 25 mV, high = 46 mV
- LM5064, LM5066, LM5066i: low = 26 mV, high = 50 mV

The Bit 4 mapping to High/Low current limit is handled dynamically on
probe because it is swapped for LM25066 compared to the other supported
chips.

Signed-off-by: Potin Lai <potin.lai.pt@gmail.com>
Link: https://lore.kernel.org/r/20260615-lm25066-cl-config-v3-2-decb4f5b0b77@gmail.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Potin Lai 2026-06-15 17:49:17 +08:00 committed by Guenter Roeck
parent 47afef9f4c
commit a86e9ca4ed
1 changed files with 37 additions and 0 deletions
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37
drivers/hwmon/pmbus/lm25066.c
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@ -35,6 +35,7 @@ enum chips { lm25056, lm25066, lm5064, lm5066, lm5066i };
#define LM25066_READ_AVG_PIN 0xdf
#define LM25066_DEV_SETUP_CL BIT(4) /* Current limit */
#define LM25066_DEV_SETUP_CL_CFG BIT(2) /* Current limit configuration */
#define LM25066_SAMPLES_FOR_AVG_MAX 4096
@ -485,6 +486,42 @@ static int lm25066_probe(struct i2c_client *client)
data->id = (enum chips)(unsigned long)i2c_get_match_data(client);
if (data->id != lm25056) {
int config_new = config;
const char *cl_setting;
int ret;
if (!of_property_read_string(client->dev.of_node,
"ti,current-range", &cl_setting)) {
config_new |= LM25066_DEV_SETUP_CL_CFG;
if (strcmp(cl_setting, "high") == 0) {
if (data->id == lm25066)
config_new |= LM25066_DEV_SETUP_CL;
else
config_new &= ~LM25066_DEV_SETUP_CL;
} else if (strcmp(cl_setting, "low") == 0) {
if (data->id == lm25066)
config_new &= ~LM25066_DEV_SETUP_CL;
else
config_new |= LM25066_DEV_SETUP_CL;
} else {
dev_err(&client->dev,
"invalid current-range setting: %s\n",
cl_setting);
return -EINVAL;
}
}
if (config_new != config) {
ret = i2c_smbus_write_byte_data(client,
LM25066_DEVICE_SETUP,
config_new);
if (ret < 0)
return ret;
config = config_new;
}
}
info = &data->info;
info->pages = 1;