From a86e9ca4eda2445b582aad4cff42504fa8be6f61 Mon Sep 17 00:00:00 2001 From: Potin Lai Date: Mon, 15 Jun 2026 17:49:17 +0800 Subject: [PATCH] hwmon: (pmbus/lm25066) add current limit configuration support 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 Link: https://lore.kernel.org/r/20260615-lm25066-cl-config-v3-2-decb4f5b0b77@gmail.com Signed-off-by: Guenter Roeck --- drivers/hwmon/pmbus/lm25066.c | 37 +++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/drivers/hwmon/pmbus/lm25066.c b/drivers/hwmon/pmbus/lm25066.c index c797e2e8258f..497802c646e9 100644 --- a/drivers/hwmon/pmbus/lm25066.c +++ b/drivers/hwmon/pmbus/lm25066.c @@ -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;