[PATCH] regulator: fp9931: Fix error handling for optional regulator

[Robby Cai <robby.cai@nxp.com>]

If "vin" reg does not exist in the device tree, the regulator framework
returns -ENODEV, which is normal for an optional supply. But the current
code treats -ENODEV as a fatal error, causing the driver probe to fail.
This patch fixes that by handling -ENODEV correctly for optional regulator.

Fixes: 12d821bd13d4 ("regulator: Add FP9931/JD9930 driver")
Signed-off-by: Robby Cai <robby.cai@nxp.com>
---
 drivers/regulator/fp9931.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/fp9931.c b/drivers/regulator/fp9931.c
index 7fbcc6327cc63..fa7f32adfb666 100644
--- a/drivers/regulator/fp9931.c
+++ b/drivers/regulator/fp9931.c
@@ -448,9 +448,13 @@ static int fp9931_probe(struct i2c_client *client)
 				     "failed to allocate regmap!\n");
 
 	data->vin_reg = devm_regulator_get_optional(&client->dev, "vin");
-	if (IS_ERR(data->vin_reg))
-		return dev_err_probe(&client->dev, PTR_ERR(data->vin_reg),
-				     "failed to get vin regulator\n");
+	if (IS_ERR(data->vin_reg)) {
+		if (PTR_ERR(data->vin_reg) != -ENODEV)
+			return dev_err_probe(&client->dev, PTR_ERR(data->vin_reg),
+					     "failed to get vin regulator\n");
+
+		data->vin_reg = NULL;
+	}
 
 	data->pgood_gpio = devm_gpiod_get(&client->dev, "pg", GPIOD_IN);
 	if (IS_ERR(data->pgood_gpio))
-- 
2.37.1