[PATCH v2 5/6] media: i2c: ov9282: Add regulator support

[Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>]

Need in case the sensors is supplied by a switchable regulator.

Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
---
Changes in v2:
* Remove error message for failed regulator_bulk_disable()
* Rename ov9282_configure_regulators to ov9282_get_regulators

 drivers/media/i2c/ov9282.c | 39 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
index 04fda8222e07..263cdffc558f 100644
--- a/drivers/media/i2c/ov9282.c
+++ b/drivers/media/i2c/ov9282.c
@@ -11,6 +11,7 @@
 #include <linux/i2c.h>
 #include <linux/module.h>
 #include <linux/pm_runtime.h>
+#include <linux/regulator/consumer.h>
 
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-fwnode.h>
@@ -55,6 +56,14 @@
 #define OV9282_REG_MIN		0x00
 #define OV9282_REG_MAX		0xfffff
 
+static const char * const ov9282_supply_names[] = {
+	"avdd",		/* Analog power */
+	"dovdd",	/* Digital I/O power */
+	"dvdd",		/* Digital core power */
+};
+
+#define OV9282_NUM_SUPPLIES ARRAY_SIZE(ov9282_supply_names)
+
 /**
  * struct ov9282_reg - ov9282 sensor register
  * @address: Register address
@@ -127,6 +136,7 @@ struct ov9282 {
 	struct media_pad pad;
 	struct gpio_desc *reset_gpio;
 	struct clk *inclk;
+	struct regulator_bulk_data supplies[OV9282_NUM_SUPPLIES];
 	struct v4l2_ctrl_handler ctrl_handler;
 	struct v4l2_ctrl *link_freq_ctrl;
 	struct v4l2_ctrl *pclk_ctrl;
@@ -883,10 +893,18 @@ static int ov9282_power_on(struct device *dev)
 		goto error_reset;
 	}
 
+	ret = regulator_bulk_enable(ARRAY_SIZE(ov9282->supplies), ov9282->supplies);
+	if (ret) {
+		dev_err(dev, "Failed to enable regulators\n");
+		goto disable_clk;
+	}
+
 	usleep_range(400, 600);
 
 	return 0;
 
+disable_clk:
+	clk_disable_unprepare(ov9282->inclk);
 error_reset:
 	gpiod_set_value_cansleep(ov9282->reset_gpio, 0);
 
@@ -903,6 +921,9 @@ static int ov9282_power_off(struct device *dev)
 {
 	struct v4l2_subdev *sd = dev_get_drvdata(dev);
 	struct ov9282 *ov9282 = to_ov9282(sd);
+	int ret;
+
+	regulator_bulk_disable(ARRAY_SIZE(ov9282->supplies), ov9282->supplies);
 
 	gpiod_set_value_cansleep(ov9282->reset_gpio, 0);
 
@@ -996,6 +1017,18 @@ static int ov9282_init_controls(struct ov9282 *ov9282)
 	return 0;
 }
 
+static int ov9282_get_regulators(struct ov9282 *ov9282)
+{
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(ov9282->supplies); i++)
+		ov9282->supplies[i].supply = ov9282_supply_names[i];
+
+	return devm_regulator_bulk_get(ov9282->dev,
+				       ARRAY_SIZE(ov9282->supplies),
+				       ov9282->supplies);
+}
+
 /**
  * ov9282_probe() - I2C client device binding
  * @client: pointer to i2c client device
@@ -1022,6 +1055,12 @@ static int ov9282_probe(struct i2c_client *client)
 		return ret;
 	}
 
+	ret = ov9282_get_regulators(ov9282);
+	if (ret) {
+		dev_err(&client->dev, "Failed to get power regulators\n");
+		return ret;
+	}
+
 	mutex_init(&ov9282->mutex);
 
 	ret = ov9282_power_on(ov9282->dev);
-- 
2.25.1