From 0f2ea90b02dff030db20b3725a4b3148c51892d8 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Mon, 22 Nov 2021 12:31:35 +0000
Subject: [PATCH] media: i2c: ov5647: Add support for regulator
 control.

The driver supported using GPIOs to control the shutdown line,
but no regulator control.

Add regulator hooks.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 drivers/media/i2c/ov5647.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

--- a/drivers/media/i2c/ov5647.c
+++ b/drivers/media/i2c/ov5647.c
@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/of_graph.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 #include <linux/slab.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-ctrls.h>
@@ -82,6 +83,15 @@
 #define OV5647_EXPOSURE_DEFAULT		1000
 #define OV5647_EXPOSURE_MAX		65535
 
+/* regulator supplies */
+static const char * const ov5647_supply_names[] = {
+	"avdd",		/* Analog power */
+	"dovdd",	/* Digital I/O power */
+	"dvdd",		/* Digital core power */
+};
+
+#define OV5647_NUM_SUPPLIES ARRAY_SIZE(ov5647_supply_names)
+
 struct regval_list {
 	u16 addr;
 	u8 data;
@@ -103,6 +113,7 @@ struct ov5647 {
 	struct mutex			lock;
 	struct clk			*xclk;
 	struct gpio_desc		*pwdn;
+	struct regulator_bulk_data supplies[OV5647_NUM_SUPPLIES];
 	bool				clock_ncont;
 	struct v4l2_ctrl_handler	ctrls;
 	const struct ov5647_mode	*mode;
@@ -787,6 +798,12 @@ static int ov5647_power_on(struct device
 
 	dev_dbg(dev, "OV5647 power on\n");
 
+	ret = regulator_bulk_enable(OV5647_NUM_SUPPLIES, sensor->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators\n");
+		return ret;
+	}
+
 	if (sensor->pwdn) {
 		gpiod_set_value_cansleep(sensor->pwdn, 0);
 		msleep(PWDN_ACTIVE_DELAY_MS);
@@ -818,6 +835,7 @@ error_clk_disable:
 	clk_disable_unprepare(sensor->xclk);
 error_pwdn:
 	gpiod_set_value_cansleep(sensor->pwdn, 1);
+	regulator_bulk_disable(OV5647_NUM_SUPPLIES, sensor->supplies);
 
 	return ret;
 }
@@ -847,6 +865,7 @@ static int ov5647_power_off(struct devic
 
 	clk_disable_unprepare(sensor->xclk);
 	gpiod_set_value_cansleep(sensor->pwdn, 1);
+	regulator_bulk_disable(OV5647_NUM_SUPPLIES, sensor->supplies);
 
 	return 0;
 }
@@ -1347,6 +1366,18 @@ static const struct v4l2_ctrl_ops ov5647
 	.s_ctrl = ov5647_s_ctrl,
 };
 
+static int ov5647_configure_regulators(struct device *dev,
+				       struct ov5647 *sensor)
+{
+	unsigned int i;
+
+	for (i = 0; i < OV5647_NUM_SUPPLIES; i++)
+		sensor->supplies[i].supply = ov5647_supply_names[i];
+
+	return devm_regulator_bulk_get(dev, OV5647_NUM_SUPPLIES,
+				       sensor->supplies);
+}
+
 static int ov5647_init_controls(struct ov5647 *sensor, struct device *dev)
 {
 	struct i2c_client *client = v4l2_get_subdevdata(&sensor->sd);
@@ -1494,6 +1525,12 @@ static int ov5647_probe(struct i2c_clien
 		return -EINVAL;
 	}
 
+	ret = ov5647_configure_regulators(dev, sensor);
+	if (ret) {
+		dev_err(dev, "Failed to get power regulators\n");
+		return ret;
+	}
+
 	mutex_init(&sensor->lock);
 
 	sensor->mode = OV5647_DEFAULT_MODE;