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Subject[PATCH v2 4/5] regulator: pca9450: Make warm reset on WDOG_B assertion
Date
From: Rickard x Andersson <rickaran@axis.com>

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>
---
drivers/regulator/pca9450-regulator.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/pca9450-regulator.c b/drivers/regulator/pca9450-regulator.c
index 87b4e6e29ba1..4a3ae73c600c 100644
--- a/drivers/regulator/pca9450-regulator.c
+++ b/drivers/regulator/pca9450-regulator.c
@@ -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;
--
2.20.1
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