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58 lines
1.9 KiB
Diff
58 lines
1.9 KiB
Diff
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From 9bca598d4a86e88afb29fdb516c68b2519bd0fb9 Mon Sep 17 00:00:00 2001
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From: Robert Marko <robert.marko@sartura.hr>
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Date: Thu, 10 Jun 2021 00:07:27 +0200
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Subject: [PATCH 3/4] hwmon: (tps23861) set current shunt value
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TPS23861 has a configuration bit for setting of the
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current shunt value used on the board.
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Its bit 0 of the General Mask 1 register.
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According to the datasheet bit values are:
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0 for 255 mOhm (Default)
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1 for 250 mOhm
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So, configure the bit before registering the hwmon
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device according to the value passed in the DTS or
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default one if none is passed.
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This caused potentially reading slightly skewed values
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due to max current value being 1.02A when 250mOhm shunt
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is used instead of 1.0A when 255mOhm is used.
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Fixes: fff7b8ab2255 ("hwmon: add Texas Instruments TPS23861 driver")
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Signed-off-by: Robert Marko <robert.marko@sartura.hr>
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Link: https://lore.kernel.org/r/20210609220728.499879-2-robert.marko@sartura.hr
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Signed-off-by: Guenter Roeck <linux@roeck-us.net>
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---
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drivers/hwmon/tps23861.c | 12 ++++++++++++
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1 file changed, 12 insertions(+)
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--- a/drivers/hwmon/tps23861.c
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+++ b/drivers/hwmon/tps23861.c
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@@ -99,6 +99,9 @@
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#define POWER_ENABLE 0x19
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#define TPS23861_NUM_PORTS 4
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+#define TPS23861_GENERAL_MASK_1 0x17
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+#define TPS23861_CURRENT_SHUNT_MASK BIT(0)
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+
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#define TEMPERATURE_LSB 652 /* 0.652 degrees Celsius */
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#define VOLTAGE_LSB 3662 /* 3.662 mV */
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#define SHUNT_RESISTOR_DEFAULT 255000 /* 255 mOhm */
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@@ -561,6 +564,15 @@ static int tps23861_probe(struct i2c_cli
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else
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data->shunt_resistor = SHUNT_RESISTOR_DEFAULT;
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+ if (data->shunt_resistor == SHUNT_RESISTOR_DEFAULT)
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+ regmap_clear_bits(data->regmap,
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+ TPS23861_GENERAL_MASK_1,
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+ TPS23861_CURRENT_SHUNT_MASK);
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+ else
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+ regmap_set_bits(data->regmap,
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+ TPS23861_GENERAL_MASK_1,
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+ TPS23861_CURRENT_SHUNT_MASK);
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+
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hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
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data, &tps23861_chip_info,
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NULL);
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