regulator: sy7636a: add gpios and input regulator

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 <[e-mail]>
Signed-off-by: Andreas Kemnade <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/sy7636a-regulator.c

···
 #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>
···
 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)
···
 
 	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);