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authorRobert Marko <robert.marko@sartura.hr>2021-06-10 00:07:27 +0200
committerGuenter Roeck <linux@roeck-us.net>2021-06-10 08:38:52 -0700
commitb325d3526e14942d42c392c2ac9fbea59c22894c (patch)
tree2e7cac107413afa0181ad44f83df9845b028bb98 /drivers/hwmon
parentfb8543fb863e89baa433b4d716d73395caa1b7f4 (diff)
downloadlwn-b325d3526e14942d42c392c2ac9fbea59c22894c.tar.gz
lwn-b325d3526e14942d42c392c2ac9fbea59c22894c.zip
hwmon: (tps23861) set current shunt value
TPS23861 has a configuration bit for setting of the current shunt value used on the board. Its bit 0 of the General Mask 1 register. According to the datasheet bit values are: 0 for 255 mOhm (Default) 1 for 250 mOhm So, configure the bit before registering the hwmon device according to the value passed in the DTS or default one if none is passed. This caused potentially reading slightly skewed values due to max current value being 1.02A when 250mOhm shunt is used instead of 1.0A when 255mOhm is used. Fixes: fff7b8ab2255 ("hwmon: add Texas Instruments TPS23861 driver") Signed-off-by: Robert Marko <robert.marko@sartura.hr> Link: https://lore.kernel.org/r/20210609220728.499879-2-robert.marko@sartura.hr Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'drivers/hwmon')
-rw-r--r--drivers/hwmon/tps23861.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/hwmon/tps23861.c b/drivers/hwmon/tps23861.c
index fd0be8883829..c3685b7e9e82 100644
--- a/drivers/hwmon/tps23861.c
+++ b/drivers/hwmon/tps23861.c
@@ -99,6 +99,9 @@
#define POWER_ENABLE 0x19
#define TPS23861_NUM_PORTS 4
+#define TPS23861_GENERAL_MASK_1 0x17
+#define TPS23861_CURRENT_SHUNT_MASK BIT(0)
+
#define TEMPERATURE_LSB 652 /* 0.652 degrees Celsius */
#define VOLTAGE_LSB 3662 /* 3.662 mV */
#define SHUNT_RESISTOR_DEFAULT 255000 /* 255 mOhm */
@@ -561,6 +564,15 @@ static int tps23861_probe(struct i2c_client *client)
else
data->shunt_resistor = SHUNT_RESISTOR_DEFAULT;
+ if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT)
+ regmap_clear_bits(data->regmap,
+ TPS23861_GENERAL_MASK_1,
+ TPS23861_CURRENT_SHUNT_MASK);
+ else
+ regmap_set_bits(data->regmap,
+ TPS23861_GENERAL_MASK_1,
+ TPS23861_CURRENT_SHUNT_MASK);
+
hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
data, &tps23861_chip_info,
NULL);