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regulator: pca9450: Make warm reset on WDOG_B assertion 

The default configuration of the PMIC behavior makes the PMIC
power cycle most regulators on WDOG_B assertion. This power
cycling causes the memory contents of OCRAM to be lost.
Some systems neeeds some memory that survives reset and
reboot, therefore this patch is created.

Signed-off-by: Rickard x Andersson <rickaran@axis.com>
Link: https://lore.kernel.org/r/20220429072211.24957-4-rickaran@axis.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Rickard x Andersson 2022-04-29 09:22:10 +02:00 committed by Mark Brown
parent bd2f5e7145
commit 2364a64d06
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 7 additions and 1 deletions
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8
drivers/regulator/pca9450-regulator.c
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@ -702,6 +702,7 @@ static int pca9450_i2c_probe(struct i2c_client *i2c,
struct regulator_config config = { };
struct pca9450 *pca9450;
unsigned int device_id, i;
unsigned int reset_ctrl;
int ret;
if (!i2c->irq) {
@ -802,9 +803,14 @@ static int pca9450_i2c_probe(struct i2c_client *i2c,
return ret;
}
if (of_property_read_bool(i2c->dev.of_node, "nxp,wdog_b-warm-reset"))
reset_ctrl = WDOG_B_CFG_WARM;
else
reset_ctrl = WDOG_B_CFG_COLD_LDO12;
/* 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);
WDOG_B_CFG_MASK, reset_ctrl);
if (ret) {
dev_err(&i2c->dev, "Failed to set WDOG_B reset behavior\n");
return ret;