[U-Boot] [PATCH v4 7/9] power: regulator: s2mps11: Add enable delay

[Krzysztof Kozlowski]

According to datasheet, the output on LDO regulators will start
appearing after 10-15 us.

Signed-off-by: Krzysztof Kozlowski <krzk at kernel.org>
Tested-by: Anand Moon <linux.amoon at gmail.com>
---
 drivers/power/regulator/s2mps11_regulator.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/power/regulator/s2mps11_regulator.c b/drivers/power/regulator/s2mps11_regulator.c
index 723d27f67c9a..67d1f9689de3 100644
--- a/drivers/power/regulator/s2mps11_regulator.c
+++ b/drivers/power/regulator/s2mps11_regulator.c
@@ -551,7 +551,16 @@ static int ldo_get_enable(struct udevice *dev)
 
 static int ldo_set_enable(struct udevice *dev, bool enable)
 {
-	return s2mps11_ldo_enable(dev, PMIC_OP_SET, &enable);
+	int ret;
+
+	ret = s2mps11_ldo_enable(dev, PMIC_OP_SET, &enable);
+	if (ret)
+		return ret;
+
+	/* Wait the "enable delay" for voltage to start to rise */
+	udelay(15);
+
+	return 0;
 }
 
 static int ldo_get_mode(struct udevice *dev)
-- 
2.17.1