regulator: pca9450: Enable system reset on WDOG_B assertion

By default the PCA9450 doesn't handle the assertion of the WDOG_B
signal, but this is required to guarantee that things like software
resets triggered by the watchdog work reliably.

As we don't want to rely on the bootloader to enable this, we tell
the PMIC to issue a cold reset in case the WDOG_B signal is
asserted (WDOG_B_CFG = 10), just as the NXP U-Boot code does.

Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Link: https://lore.kernel.org/r/20210211105534.38972-3-frieder.schrempf@kontron.de
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Frieder Schrempf 2021-02-11 11:55:30 +01:00 committed by Mark Brown
parent 8c67a11bae
commit f7684f5a04
No known key found for this signature in database
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2 changed files with 15 additions and 0 deletions

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@ -797,6 +797,14 @@ static int pca9450_i2c_probe(struct i2c_client *i2c,
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);
if (ret) {
dev_err(&i2c->dev, "Failed to set WDOG_B reset behavior\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

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@ -216,4 +216,11 @@ enum {
#define IRQ_THERM_105 0x02
#define IRQ_THERM_125 0x01
/* PCA9450_REG_RESET_CTRL bits */
#define WDOG_B_CFG_MASK 0xC0
#define WDOG_B_CFG_NONE 0x00
#define WDOG_B_CFG_WARM 0x40
#define WDOG_B_CFG_COLD_LDO12 0x80
#define WDOG_B_CFG_COLD 0xC0
#endif /* __LINUX_REG_PCA9450_H__ */