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regulator: pca9450: Make I2C Level Translator configurable

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Make the I2C Level Translator included in PCA9450 configurable from
devicetree. The reset state is off. By setting nxp,i2c-lt-enable, the
I2C Level Translator will be enabled while in STANDBY or RUN state.

Signed-off-by: Per-Daniel Olsson <perdo@axis.com>
Signed-off-by: Rickard x Andersson <rickaran@axis.com>
Link: https://lore.kernel.org/r/20220429072211.24957-2-rickaran@axis.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Per-Daniel Olsson 2022-04-29 09:22:08 +02:00 committed by Mark Brown
parent e721b16139
commit 62139f52b7
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GPG key ID: 24D68B725D5487D0
2 changed files with 18 additions and 0 deletions
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11
drivers/regulator/pca9450-regulator.c
View file

@ -810,6 +810,17 @@ static int pca9450_i2c_probe(struct i2c_client *i2c,
return ret;
}
if (of_property_read_bool(i2c->dev.of_node, "nxp,i2c-lt-enable")) {
/* Enable I2C Level Translator */
ret = regmap_update_bits(pca9450->regmap, PCA9450_REG_CONFIG2,
I2C_LT_MASK, I2C_LT_ON_STANDBY_RUN);
if (ret) {
dev_err(&i2c->dev,
"Failed to enable I2C level translator\n");
return ret;
}
}
/*
* The driver uses the LDO5CTRL_H register to control the LDO5 regulator.
* This is only valid if the SD_VSEL input of the PMIC is high. Let's

7
include/linux/regulator/pca9450.h
View file

@ -226,4 +226,11 @@ enum {
#define WDOG_B_CFG_COLD_LDO12 0x80
#define WDOG_B_CFG_COLD 0xC0
/* PCA9450_REG_CONFIG2 bits */
#define I2C_LT_MASK 0x03
#define I2C_LT_FORCE_DISABLE 0x00
#define I2C_LT_ON_STANDBY_RUN 0x01
#define I2C_LT_ON_RUN 0x02
#define I2C_LT_FORCE_ENABLE 0x03
#endif /* __LINUX_REG_PCA9450_H__ */