linux-kernel - [PATCH 4/5] regulator: pca9450: Make warm reset on WDOG

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Message-ID: <20220428140139.7349-4-rickaran@axis.com>
Date:   Thu, 28 Apr 2022 16:01:38 +0200
From:   Rickard Andersson <rickaran@...s.com>
To:     <broonie@...nel.org>, <lgirdwood@...il.com>,
        <linux-kernel@...r.kernel.org>, <yibin.gong@....com>
CC:     <rickaran@...s.com>, <rickard314.andersson@...il.com>,
        <perdo@...s.com>
Subject: [PATCH 4/5] regulator: pca9450: Make warm reset on WDOG_B assertion

From: Rickard x Andersson <rickaran@...s.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@...s.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