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regulator: pca9450: Clear PRESET_EN bit to fix BUCK1/2/3 voltage setting 

The driver uses the DVS registers PCA9450_REG_BUCKxOUT_DVS0 to set the
voltage for the buck regulators 1, 2 and 3. This has no effect as the
PRESET_EN bit is set by default and therefore the preset values are used
instead, which are set to 850 mV.

To fix this we clear the PRESET_EN bit at time of initialization.

Fixes: 0935ff5f1f ("regulator: pca9450: add pca9450 pmic driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Link: https://lore.kernel.org/r/20210222115229.166620-1-frieder.schrempf@kontron.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Frieder Schrempf 2021-02-22 12:52:20 +01:00 committed by Mark Brown
parent dfe03bca8d
commit 98b94b6e38
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
2 changed files with 11 additions and 0 deletions
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8
drivers/regulator/pca9450-regulator.c
View File

@ -797,6 +797,14 @@ static int pca9450_i2c_probe(struct i2c_client *i2c,
return ret;
}
/* Clear PRESET_EN bit in BUCK123_DVS to use DVS registers */
ret = regmap_clear_bits(pca9450->regmap, PCA9450_REG_BUCK123_DVS,
BUCK123_PRESET_EN);
if (ret) {
dev_err(&i2c->dev, "Failed to clear PRESET_EN bit: %d\n", ret);
return ret;
}
/* Set reset behavior on assertion of WDOG_B signal */
ret = regmap_update_bits(pca9450->regmap, PCA9450_REG_RESET_CTRL,
WDOG_B_CFG_MASK, WDOG_B_CFG_COLD_LDO12);

3
include/linux/regulator/pca9450.h
View File

@ -147,6 +147,9 @@ enum {
#define BUCK6_FPWM 0x04
#define BUCK6_ENMODE_MASK 0x03
/* PCA9450_REG_BUCK123_PRESET_EN bit */
#define BUCK123_PRESET_EN 0x80
/* PCA9450_BUCK1OUT_DVS0 bits */
#define BUCK1OUT_DVS0_MASK 0x7F
#define BUCK1OUT_DVS0_DEFAULT 0x14