[v2,4/4] media: ov2740: Add regulator support

Commit Message

Hans de Goede Dec. 20, 2024, 11:43 a.m. UTC

On some designs the regulators for the AVDD / DOVDD / DVDD power rails
are controlled by Linux.

Add support to the driver for getting regulators for these 3 rails and
for enabling these regulators when necessary.

The datasheet specifies a delay of 0ns between enabling the regulators,
IOW they can all 3 be enabled at the same time. This allows using the bulk
regulator API.

The regulator core will provide dummy regulators for the 3 power-rails
when necessary.

Acked-by: Ricardo Ribalda <[e-mail]>
Tested-by: Stanislaw Gruszka <[e-mail]>
Signed-off-by: Hans de Goede <[e-mail]>
---
Changes in v2:
- Directly use ARRAY_SIZE(ov2740_supply_name), drop OV2740_NUM_SUPPLIES define
- Make i in probe() unsigned
---
 drivers/media/i2c/ov2740.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/media/i2c/ov2740.c b/drivers/media/i2c/ov2740.c
index 0ee83e2680eb..80d151e8ae29 100644
--- a/drivers/media/i2c/ov2740.c
+++ b/drivers/media/i2c/ov2740.c
@@ -11,6 +11,7 @@ 
 #include <linux/pm_runtime.h>
 #include <linux/nvmem-provider.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <media/v4l2-ctrls.h>
 #include <media/v4l2-device.h>
 #include <media/v4l2-fwnode.h>
@@ -76,6 +77,12 @@ 
 /* OTP registers from sensor */
 #define OV2740_REG_OTP_CUSTOMER		0x7010
 
+static const char * const ov2740_supply_name[] = {
+	"AVDD",
+	"DOVDD",
+	"DVDD",
+};
+
 struct nvm_data {
 	struct nvmem_device *nvmem;
 	struct regmap *regmap;
@@ -523,10 +530,11 @@  struct ov2740 {
 	struct v4l2_ctrl *hblank;
 	struct v4l2_ctrl *exposure;
 
-	/* GPIOs, clocks */
+	/* GPIOs, clocks, regulators */
 	struct gpio_desc *reset_gpio;
 	struct gpio_desc *powerdown_gpio;
 	struct clk *clk;
+	struct regulator_bulk_data supplies[ARRAY_SIZE(ov2740_supply_name)];
 
 	/* Current mode */
 	const struct ov2740_mode *cur_mode;
@@ -1311,6 +1319,8 @@  static int ov2740_suspend(struct device *dev)
 	gpiod_set_value_cansleep(ov2740->reset_gpio, 1);
 	gpiod_set_value_cansleep(ov2740->powerdown_gpio, 1);
 	clk_disable_unprepare(ov2740->clk);
+	regulator_bulk_disable(ARRAY_SIZE(ov2740_supply_name),
+			       ov2740->supplies);
 	return 0;
 }
 
@@ -1320,10 +1330,18 @@  static int ov2740_resume(struct device *dev)
 	struct ov2740 *ov2740 = to_ov2740(sd);
 	int ret;
 
-	ret = clk_prepare_enable(ov2740->clk);
+	ret = regulator_bulk_enable(ARRAY_SIZE(ov2740_supply_name),
+				    ov2740->supplies);
 	if (ret)
 		return ret;
 
+	ret = clk_prepare_enable(ov2740->clk);
+	if (ret) {
+		regulator_bulk_disable(ARRAY_SIZE(ov2740_supply_name),
+				       ov2740->supplies);
+		return ret;
+	}
+
 	gpiod_set_value_cansleep(ov2740->powerdown_gpio, 0);
 	gpiod_set_value_cansleep(ov2740->reset_gpio, 0);
 	msleep(20);
@@ -1336,6 +1354,7 @@  static int ov2740_probe(struct i2c_client *client)
 	struct device *dev = &client->dev;
 	struct ov2740 *ov2740;
 	bool full_power;
+	unsigned int i;
 	int ret;
 
 	ov2740 = devm_kzalloc(&client->dev, sizeof(*ov2740), GFP_KERNEL);
@@ -1374,6 +1393,14 @@  static int ov2740_probe(struct i2c_client *client)
 		return dev_err_probe(dev, PTR_ERR(ov2740->clk),
 				     "failed to get clock\n");
 
+	for (i = 0; i < ARRAY_SIZE(ov2740_supply_name); i++)
+		ov2740->supplies[i].supply = ov2740_supply_name[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ov2740_supply_name),
+				      ov2740->supplies);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to get regulators\n");
+
 	full_power = acpi_dev_state_d0(&client->dev);
 	if (full_power) {
 		/* ACPI does not always clear the reset GPIO / enable the clock */