diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0323-ov5647-Add-support-for-PWDN-GPIO.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0323-ov5647-Add-support-for-PWDN-GPIO.patch | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0323-ov5647-Add-support-for-PWDN-GPIO.patch b/target/linux/brcm2708/patches-4.14/950-0323-ov5647-Add-support-for-PWDN-GPIO.patch new file mode 100644 index 0000000000..0224698697 --- /dev/null +++ b/target/linux/brcm2708/patches-4.14/950-0323-ov5647-Add-support-for-PWDN-GPIO.patch @@ -0,0 +1,92 @@ +From 34220db79008820c110473fe804cf02af3037889 Mon Sep 17 00:00:00 2001 +From: Dave Stevenson <dave.stevenson@raspberrypi.org> +Date: Thu, 18 May 2017 15:42:34 +0100 +Subject: [PATCH 323/454] ov5647: Add support for PWDN GPIO. + +Add support for an optional GPIO connected to PWDN on the sensor. + +Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org> +--- + drivers/media/i2c/ov5647.c | 28 ++++++++++++++++++++++++++++ + 1 file changed, 28 insertions(+) + +--- a/drivers/media/i2c/ov5647.c ++++ b/drivers/media/i2c/ov5647.c +@@ -21,6 +21,7 @@ + + #include <linux/clk.h> + #include <linux/delay.h> ++#include <linux/gpio/consumer.h> + #include <linux/i2c.h> + #include <linux/init.h> + #include <linux/io.h> +@@ -35,6 +36,13 @@ + + #define SENSOR_NAME "ov5647" + ++/* ++ * From the datasheet, "20ms after PWDN goes low or 20ms after RESETB goes ++ * high if reset is inserted after PWDN goes high, host can access sensor's ++ * SCCB to initialize sensor." ++ */ ++#define PWDN_ACTIVE_DELAY_MS 20 ++ + #define OV5647_SW_RESET 0x0103 + #define OV5647_REG_CHIPID_H 0x300A + #define OV5647_REG_CHIPID_L 0x300B +@@ -77,6 +85,7 @@ struct ov5647 { + unsigned int height; + int power_count; + struct clk *xclk; ++ struct gpio_desc *pwdn; + }; + + static inline struct ov5647 *to_state(struct v4l2_subdev *sd) +@@ -334,6 +343,11 @@ static int ov5647_sensor_power(struct v4 + if (on && !ov5647->power_count) { + dev_dbg(&client->dev, "OV5647 power on\n"); + ++ if (ov5647->pwdn) { ++ gpiod_set_value(ov5647->pwdn, 0); ++ msleep(PWDN_ACTIVE_DELAY_MS); ++ } ++ + ret = clk_prepare_enable(ov5647->xclk); + if (ret < 0) { + dev_err(&client->dev, "clk prepare enable failed\n"); +@@ -371,6 +385,8 @@ static int ov5647_sensor_power(struct v4 + dev_dbg(&client->dev, "soft stby failed\n"); + + clk_disable_unprepare(ov5647->xclk); ++ ++ gpiod_set_value(ov5647->pwdn, 1); + } + + /* Update the power count. */ +@@ -583,6 +599,10 @@ static int ov5647_probe(struct i2c_clien + return -EINVAL; + } + ++ /* Request the power down GPIO asserted */ ++ sensor->pwdn = devm_gpiod_get_optional(&client->dev, "pwdn", ++ GPIOD_OUT_HIGH); ++ + mutex_init(&sensor->lock); + + sd = &sensor->sd; +@@ -596,7 +616,15 @@ static int ov5647_probe(struct i2c_clien + if (ret < 0) + goto mutex_remove; + ++ if (sensor->pwdn) { ++ gpiod_set_value(sensor->pwdn, 0); ++ msleep(PWDN_ACTIVE_DELAY_MS); ++ } ++ + ret = ov5647_detect(sd); ++ ++ gpiod_set_value(sensor->pwdn, 1); ++ + if (ret < 0) + goto error; + |