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media: i2c: ov9282: Add support for regulators.

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The sensor takes 3 supply rails - AVDD, DVDD, and DOVDD.

Add hooks into the regulator framework for each of these
regulators.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Dave Stevenson 2022-10-05 16:20:18 +01:00 committed by Mauro Carvalho Chehab
parent 91707453eb
commit 3bc80e8950
1 changed files with 38 additions and 0 deletions
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38
drivers/media/i2c/ov9282.c
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@ -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-event.h>
@ -91,6 +92,14 @@
#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
@ -162,6 +171,7 @@ 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 *hblank_ctrl;
@ -1081,6 +1091,18 @@ static int ov9282_detect(struct ov9282 *ov9282)
return 0;
}
static int ov9282_configure_regulators(struct ov9282 *ov9282)
{
unsigned int i;
for (i = 0; i < OV9282_NUM_SUPPLIES; i++)
ov9282->supplies[i].supply = ov9282_supply_names[i];
return devm_regulator_bulk_get(ov9282->dev,
OV9282_NUM_SUPPLIES,
ov9282->supplies);
}
/**
* ov9282_parse_hw_config() - Parse HW configuration and check if supported
* @ov9282: pointer to ov9282 device
@ -1117,6 +1139,12 @@ static int ov9282_parse_hw_config(struct ov9282 *ov9282)
return PTR_ERR(ov9282->inclk);
}
ret = ov9282_configure_regulators(ov9282);
if (ret) {
dev_err(ov9282->dev, "Failed to get power regulators\n");
return ret;
}
rate = clk_get_rate(ov9282->inclk);
if (rate != OV9282_INCLK_RATE) {
dev_err(ov9282->dev, "inclk frequency mismatch");
@ -1198,6 +1226,12 @@ static int ov9282_power_on(struct device *dev)
struct ov9282 *ov9282 = to_ov9282(sd);
int ret;
ret = regulator_bulk_enable(OV9282_NUM_SUPPLIES, ov9282->supplies);
if (ret < 0) {
dev_err(dev, "Failed to enable regulators\n");
return ret;
}
usleep_range(400, 600);
gpiod_set_value_cansleep(ov9282->reset_gpio, 1);
@ -1223,6 +1257,8 @@ static int ov9282_power_on(struct device *dev)
error_reset:
gpiod_set_value_cansleep(ov9282->reset_gpio, 0);
regulator_bulk_disable(OV9282_NUM_SUPPLIES, ov9282->supplies);
return ret;
}
@ -1241,6 +1277,8 @@ static int ov9282_power_off(struct device *dev)
clk_disable_unprepare(ov9282->inclk);
regulator_bulk_disable(OV9282_NUM_SUPPLIES, ov9282->supplies);
return 0;
}