diff options
Diffstat (limited to 'target/linux/generic/backport-5.10/872-v5.13-02-hwmon-tps23861-set-current-shunt-value.patch')
| -rw-r--r-- | target/linux/generic/backport-5.10/872-v5.13-02-hwmon-tps23861-set-current-shunt-value.patch | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/872-v5.13-02-hwmon-tps23861-set-current-shunt-value.patch b/target/linux/generic/backport-5.10/872-v5.13-02-hwmon-tps23861-set-current-shunt-value.patch new file mode 100644 index 0000000000..f1051f77d5 --- /dev/null +++ b/target/linux/generic/backport-5.10/872-v5.13-02-hwmon-tps23861-set-current-shunt-value.patch @@ -0,0 +1,57 @@ +From 9bca598d4a86e88afb29fdb516c68b2519bd0fb9 Mon Sep 17 00:00:00 2001 +From: Robert Marko <robert.marko@sartura.hr> +Date: Thu, 10 Jun 2021 00:07:27 +0200 +Subject: [PATCH 3/4] 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> +--- + drivers/hwmon/tps23861.c | 12 ++++++++++++ + 1 file changed, 12 insertions(+) + +--- 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_cli + 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); |