Initialize input regulator and gpios to proper values to have things
basically working as well as in the case when these things are
hardwired.

Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Andreas Kemnade <akemnade@kernel.org>
---
 drivers/regulator/sy7636a-regulator.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/drivers/regulator/sy7636a-regulator.c b/drivers/regulator/sy7636a-regulator.c
index 27e3d939b7bb9..551647bc10520 100644
--- a/drivers/regulator/sy7636a-regulator.c
+++ b/drivers/regulator/sy7636a-regulator.c
@@ -12,6 +12,7 @@
 #include <linux/mfd/sy7636a.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
 #include <linux/regulator/driver.h>
 #include <linux/regulator/machine.h>
 #include <linux/regmap.h>
@@ -19,6 +20,8 @@
 struct sy7636a_data {
 	struct regmap *regmap;
 	struct gpio_desc *pgood_gpio;
+	struct gpio_desc *en_gpio;
+	struct gpio_desc *vcom_en_gpio;
 };
 
 static int sy7636a_get_vcom_voltage_op(struct regulator_dev *rdev)
@@ -98,6 +101,30 @@ static int sy7636a_regulator_probe(struct platform_device *pdev)
 	data->regmap = regmap;
 	data->pgood_gpio = gdp;
 
+	ret = devm_regulator_get_enable_optional(&pdev->dev, "vin");
+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "failed to get vin regulator\n");
+
+	data->en_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
+						GPIOD_OUT_HIGH);
+	if (IS_ERR(data->en_gpio))
+		return dev_err_probe(&pdev->dev,
+				     PTR_ERR(data->en_gpio),
+				     "failed to get en gpio\n");
+
+	/* Let VCOM just follow the default power on sequence */
+	data->vcom_en_gpio = devm_gpiod_get_optional(&pdev->dev,
+						     "vcom-en", GPIOD_OUT_LOW);
+	if (IS_ERR(data->vcom_en_gpio))
+		return dev_err_probe(&pdev->dev,
+				     PTR_ERR(data->vcom_en_gpio),
+				     "failed to get vcom-en gpio\n");
+
+	/* if chip was not enabled, give it time to wake up */
+	if (data->en_gpio)
+		usleep_range(2500, 4000);
+
 	platform_set_drvdata(pdev, data);
 
 	ret = regmap_write(regmap, SY7636A_REG_POWER_ON_DELAY_TIME, 0x0);

-- 
2.47.3