media: noon010p30: Convert to use GPIO descriptors

The noon010pc30 sensor driver is using legacy gpio numbers passed
through platform data and open coding reverse polarity on the
GPIOs used for reset and standby.

Nothing in the kernel defines any platform data for this driver
so we can just convert the driver to use GPIO descriptors and
requires that these specify the correct polarity instead.

Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>

drivers/media/i2c/noon010pc30.c

@@ -10,7 +10,7 @@
  */
 
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/regulator/consumer.h>
@@ -130,8 +130,8 @@ struct noon010_info {
 	struct media_pad pad;
 	struct v4l2_ctrl_handler hdl;
 	struct regulator_bulk_data supply[NOON010_NUM_SUPPLIES];
-	u32 gpio_nreset;
-	u32 gpio_nstby;
+	struct gpio_desc *reset;
+	struct gpio_desc *stby;
 
 	/* Protects the struct members below */
 	struct mutex lock;
@@ -393,29 +393,33 @@ static int power_enable(struct noon010_info *info)
 		return 0;
 	}
 
-	if (gpio_is_valid(info->gpio_nstby))
-		gpio_set_value(info->gpio_nstby, 0);
+	/* Assert standby: line should be flagged active low in descriptor */
+	if (info->stby)
+		gpiod_set_value(info->stby, 1);
 
-	if (gpio_is_valid(info->gpio_nreset))
-		gpio_set_value(info->gpio_nreset, 0);
+	/* Assert reset: line should be flagged active low in descriptor */
+	if (info->reset)
+		gpiod_set_value(info->reset, 1);
 
 	ret = regulator_bulk_enable(NOON010_NUM_SUPPLIES, info->supply);
 	if (ret)
 		return ret;
 
-	if (gpio_is_valid(info->gpio_nreset)) {
+	/* De-assert reset and standby */
+	if (info->reset) {
 		msleep(50);
-		gpio_set_value(info->gpio_nreset, 1);
+		gpiod_set_value(info->reset, 0);
 	}
-	if (gpio_is_valid(info->gpio_nstby)) {
+	if (info->stby) {
 		udelay(1000);
-		gpio_set_value(info->gpio_nstby, 1);
+		gpiod_set_value(info->stby, 0);
 	}
-	if (gpio_is_valid(info->gpio_nreset)) {
+	/* Cycle reset: assert and deassert */
+	if (info->reset) {
 		udelay(1000);
-		gpio_set_value(info->gpio_nreset, 0);
+		gpiod_set_value(info->reset, 1);
 		msleep(100);
-		gpio_set_value(info->gpio_nreset, 1);
+		gpiod_set_value(info->reset, 0);
 		msleep(20);
 	}
 	info->power = 1;
@@ -438,11 +442,12 @@ static int power_disable(struct noon010_info *info)
 	if (ret)
 		return ret;
 
-	if (gpio_is_valid(info->gpio_nstby))
-		gpio_set_value(info->gpio_nstby, 0);
+	/* Assert standby and reset */
+	if (info->stby)
+		gpiod_set_value(info->stby, 1);
 
-	if (gpio_is_valid(info->gpio_nreset))
-		gpio_set_value(info->gpio_nreset, 0);
+	if (info->reset)
+		gpiod_set_value(info->reset, 1);
 
 	info->power = 0;
 
@@ -741,34 +746,24 @@ static int noon010_probe(struct i2c_client *client,
 		goto np_err;
 
 	info->i2c_reg_page	= -1;
-	info->gpio_nreset	= -EINVAL;
-	info->gpio_nstby	= -EINVAL;
 	info->curr_fmt		= &noon010_formats[0];
 	info->curr_win		= &noon010_sizes[0];
 
-	if (gpio_is_valid(pdata->gpio_nreset)) {
-		ret = devm_gpio_request_one(&client->dev, pdata->gpio_nreset,
-					    GPIOF_OUT_INIT_LOW,
-					    "NOON010PC30 NRST");
-		if (ret) {
-			dev_err(&client->dev, "GPIO request error: %d\n", ret);
+	/* Request reset asserted so we get put into reset */
+	info->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(info->reset)) {
+		ret = PTR_ERR(info->reset);
 		goto np_err;
 	}
-		info->gpio_nreset = pdata->gpio_nreset;
-		gpio_export(info->gpio_nreset, 0);
-	}
+	gpiod_set_consumer_name(info->reset, "NOON010PC30 NRST");
 
-	if (gpio_is_valid(pdata->gpio_nstby)) {
-		ret = devm_gpio_request_one(&client->dev, pdata->gpio_nstby,
-					    GPIOF_OUT_INIT_LOW,
-					    "NOON010PC30 NSTBY");
-		if (ret) {
-			dev_err(&client->dev, "GPIO request error: %d\n", ret);
+	/* Request standby asserted so we get put into standby */
+	info->stby = devm_gpiod_get(&client->dev, "standby", GPIOD_OUT_HIGH);
+	if (IS_ERR(info->stby)) {
+		ret = PTR_ERR(info->stby);
 		goto np_err;
 	}
-		info->gpio_nstby = pdata->gpio_nstby;
-		gpio_export(info->gpio_nstby, 0);
-	}
+	gpiod_set_consumer_name(info->reset, "NOON010PC30 STBY");
 
 	for (i = 0; i < NOON010_NUM_SUPPLIES; i++)
 		info->supply[i].supply = noon010_supply_name[i];

include/media/i2c/noon010pc30.h

@@ -12,14 +12,10 @@
 /**
  * struct noon010pc30_platform_data - platform data
  * @clk_rate: the clock frequency in Hz
- * @gpio_nreset: GPIO driving nRESET pin
- * @gpio_nstby: GPIO driving nSTBY pin
  */
 
 struct noon010pc30_platform_data {
 	unsigned long clk_rate;
-	int gpio_nreset;
-	int gpio_nstby;
 };
 
 #endif /* NOON010PC30_H */