brcm2708: organize kernel patches

[openwrt/staging/dedeckeh.git] / target / linux / brcm2708 / patches-4.19 / 950-0171-media-ov5647-Add-support-for-PWDN-GPIO.patch

diff --git a/target/linux/brcm2708/patches-4.19/950-0171-media-ov5647-Add-support-for-PWDN-GPIO.patch b/target/linux/brcm2708/patches-4.19/950-0171-media-ov5647-Add-support-for-PWDN-GPIO.patch
new file mode 100644 (file)
index 0000000..80a5d90
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0171-media-ov5647-Add-support-for-PWDN-GPIO.patch
@@ -0,0 +1,92 @@
+From f41fdda9ca98e675d7467cc352c678bbcdca2df1 Mon Sep 17 00:00:00 2001
+From: Dave Stevenson <dave.stevenson@raspberrypi.org>
+Date: Wed, 31 Oct 2018 14:56:33 +0000
+Subject: [PATCH] media: 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 MIPI_CTRL00_CLOCK_LANE_GATE           BIT(5)
+ #define MIPI_CTRL00_BUS_IDLE                  BIT(2)
+ #define MIPI_CTRL00_CLOCK_LANE_DISABLE                BIT(0)
+@@ -86,6 +94,7 @@ 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)
+@@ -355,6 +364,11 @@ 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");
+@@ -392,6 +406,8 @@ 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. */
+@@ -604,6 +620,10 @@ 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;
+@@ -617,7 +637,15 @@ 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;
+