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