Provide support for enabling and disabling regulator supplies to control
power to the camera sensor.
While updating the power on function, document that a sleep is
represented as 'T4' in the datasheet power on sequence.
Signed-off-by: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
---
v2:
- document 'supplies' member variable
- disable regulators in error path
- Remove 'unhelpful' comments
Signed-off-by: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
---
drivers/media/i2c/imx335.c | 38 ++++++++++++++++++++++++++++++++++++--
1 file changed, 36 insertions(+), 2 deletions(-)
diff --git a/drivers/media/i2c/imx335.c b/drivers/media/i2c/imx335.c
index 31c612c6bdd8..f17ce40b9c77 100644
--- a/drivers/media/i2c/imx335.c
+++ b/drivers/media/i2c/imx335.c
@@ -75,6 +75,14 @@ struct imx335_reg_list {
const struct imx335_reg *regs;
};
+static const char * const imx335_supply_name[] = {
+ "avdd", /* Analog (2.9V) supply */
+ "ovdd", /* Digital I/O (1.8V) supply */
+ "dvdd", /* Digital Core (1.2V) supply */
+};
+
+#define IMX335_NUM_SUPPLIES ARRAY_SIZE(imx335_supply_name)
+
/**
* struct imx335_mode - imx335 sensor mode structure
* @width: Frame width
@@ -108,6 +116,7 @@ struct imx335_mode {
* @sd: V4L2 sub-device
* @pad: Media pad. Only one pad supported
* @reset_gpio: Sensor reset gpio
+ * @supplies: Regulator supplies to handle power control
* @inclk: Sensor input clock
* @ctrl_handler: V4L2 control handler
* @link_freq_ctrl: Pointer to link frequency control
@@ -126,6 +135,8 @@ struct imx335 {
struct v4l2_subdev sd;
struct media_pad pad;
struct gpio_desc *reset_gpio;
+ struct regulator_bulk_data supplies[IMX335_NUM_SUPPLIES];
+
struct clk *inclk;
struct v4l2_ctrl_handler ctrl_handler;
struct v4l2_ctrl *link_freq_ctrl;
@@ -781,6 +792,17 @@ static int imx335_parse_hw_config(struct imx335 *imx335)
return PTR_ERR(imx335->reset_gpio);
}
+ for (i = 0; i < IMX335_NUM_SUPPLIES; i++)
+ imx335->supplies[i].supply = imx335_supply_name[i];
+
+ ret = devm_regulator_bulk_get(imx335->dev,
+ IMX335_NUM_SUPPLIES,
+ imx335->supplies);
+ if (ret) {
+ dev_err(imx335->dev, "Failed to get regulators\n");
+ return ret;
+ }
+
/* Get sensor input clock */
imx335->inclk = devm_clk_get(imx335->dev, NULL);
if (IS_ERR(imx335->inclk)) {
@@ -863,6 +885,17 @@ static int imx335_power_on(struct device *dev)
struct imx335 *imx335 = to_imx335(sd);
int ret;
+ ret = regulator_bulk_enable(IMX335_NUM_SUPPLIES,
+ imx335->supplies);
+ if (ret) {
+ dev_err(dev, "%s: failed to enable regulators\n",
+ __func__);
+ return ret;
+ }
+
+ usleep_range(500, 550); /* Tlow */
+
+ /* Set XCLR */
gpiod_set_value_cansleep(imx335->reset_gpio, 1);
ret = clk_prepare_enable(imx335->inclk);
@@ -871,12 +904,13 @@ static int imx335_power_on(struct device *dev)
goto error_reset;
}
- usleep_range(20, 22);
+ usleep_range(20, 22); /* T4 */
return 0;
error_reset:
gpiod_set_value_cansleep(imx335->reset_gpio, 0);
+ regulator_bulk_disable(IMX335_NUM_SUPPLIES, imx335->supplies);
return ret;
}
@@ -893,8 +927,8 @@ static int imx335_power_off(struct device *dev)
struct imx335 *imx335 = to_imx335(sd);
gpiod_set_value_cansleep(imx335->reset_gpio, 0);
-
clk_disable_unprepare(imx335->inclk);
+ regulator_bulk_disable(IMX335_NUM_SUPPLIES, imx335->supplies);
return 0;
}
--
2.34.1
