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| author | Paul Geurts <paul.geurts@prodrive-technologies.com> | 2025-05-05 14:59:36 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2025-05-12 15:09:50 +0300 |
| commit | 6157e62b07d9331cc1d4d9d525dab33d45b0e83c (patch) | |
| tree | 841cb1188383bf9f5c538042556097708634cdd9 /include/linux | |
| parent | d5cc09847fa0df4034076f884de5957ec816dc52 (diff) | |
| download | linux-6157e62b07d9331cc1d4d9d525dab33d45b0e83c.tar.xz | |
regulator: pca9450: Add restart handler
When restarting a CPU powered by the PCA9450 power management IC, it
is beneficial to use the PCA9450 to power cycle the CPU and all its
connected peripherals to start up in a known state. The PCA9450 features
a cold start procedure initiated by an I2C command.
Add a restart handler so that the PCA9450 is used to restart the CPU.
The restart handler sends command 0x14 to the SW_RST register,
initiating a cold reset (Power recycle all regulators except LDO1, LDO2
and CLK_32K_OUT)
As the PCA9450 is a PMIC specific for the i.MX8M family CPU, the restart
handler priority is set just slightly higher than imx2_wdt and the PSCI
restart handler. This makes sure this restart handler takes precedence.
Signed-off-by: Paul Geurts <paul.geurts@prodrive-technologies.com>
Link: https://patch.msgid.link/20250505115936.1946891-1-paul.geurts@prodrive-technologies.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/regulator/pca9450.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/regulator/pca9450.h b/include/linux/regulator/pca9450.h index b427b5873de1..85b4fecc10d8 100644 --- a/include/linux/regulator/pca9450.h +++ b/include/linux/regulator/pca9450.h @@ -35,6 +35,8 @@ enum { PCA9450_DVS_LEVEL_MAX, }; +#define PCA9450_RESTART_HANDLER_PRIORITY 130 + #define PCA9450_BUCK1_VOLTAGE_NUM 0x80 #define PCA9450_BUCK2_VOLTAGE_NUM 0x80 #define PCA9450_BUCK3_VOLTAGE_NUM 0x80 @@ -235,4 +237,7 @@ enum { #define I2C_LT_ON_RUN 0x02 #define I2C_LT_FORCE_ENABLE 0x03 +/* PCA9450_REG_SW_RST command */ +#define SW_RST_COMMAND 0x14 + #endif /* __LINUX_REG_PCA9450_H__ */ |