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regulator: pca9450: Enable system reset on WDOG_B assertion

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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
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2 changed files with 15 additions and 0 deletions
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7
include/linux/regulator/pca9450.h
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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__ */