From: Frieder Schrempf frieder.schrempf@kontron.de
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. This causes the preset values to be used instead, which are set to 850 mV by default.
To fix this we reset the PRESET_EN bit at time of initialization.
Fixes: 0935ff5f1f0a ("regulator: pca9450: add pca9450 pmic driver") Cc: stable@vger.kernel.org Signed-off-by: Frieder Schrempf frieder.schrempf@kontron.de --- drivers/regulator/pca9450-regulator.c | 8 ++++++++ include/linux/regulator/pca9450.h | 3 +++ 2 files changed, 11 insertions(+)
diff --git a/drivers/regulator/pca9450-regulator.c b/drivers/regulator/pca9450-regulator.c index 833d398c6aa2..cf329341cb2f 100644 --- a/drivers/regulator/pca9450-regulator.c +++ b/drivers/regulator/pca9450-regulator.c @@ -797,6 +797,14 @@ static int pca9450_i2c_probe(struct i2c_client *i2c, return ret; }
+ /* Reset PRESET_EN bit in BUCK123_DVS to use DVS registers */ + ret = regmap_update_bits(pca9450->regmap, PCA9450_REG_BUCK123_DVS, + BUCK123_PRESET_EN, ~BUCK123_PRESET_EN); + if (ret) { + dev_err(&i2c->dev, "Failed to reset PRESET_EN bit\n"); + 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); diff --git a/include/linux/regulator/pca9450.h b/include/linux/regulator/pca9450.h index ccdb5320a240..71902f41c919 100644 --- a/include/linux/regulator/pca9450.h +++ b/include/linux/regulator/pca9450.h @@ -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