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From:   =?UTF-8?q?Ma=C3=ADra=20Canal?= <mairacanal@riseup.net>
To:     Mauro Carvalho Chehab <mchehab@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Sylwester Nawrocki <s.nawrocki@samsung.com>,
        Andrzej Hajda <andrzej.hajda@intel.com>
Cc:     linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        linux-media@vger.kernel.org,
        =?UTF-8?q?Ma=C3=ADra=20Canal?= <mairacanal@riseup.net>
Subject: [PATCH 1/2] media: s5c73m3: Replace legacy gpio interface for gpiod
Date:   Wed, 16 Nov 2022 16:43:06 -0300
Message-Id: <20221116194307.164543-1-mairacanal@riseup.net>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

Considering the current transition of the GPIO subsystem, remove all
dependencies of the legacy GPIO interface (linux/gpio.h and linux
/of_gpio.h) and replace it with the descriptor-based GPIO approach.

Signed-off-by: Maíra Canal <mairacanal@riseup.net>
---
 drivers/media/i2c/s5c73m3/s5c73m3-core.c | 95 ++++++++++--------------
 drivers/media/i2c/s5c73m3/s5c73m3.h      |  9 +--
 include/media/i2c/s5c73m3.h              | 15 +---
 3 files changed, 44 insertions(+), 75 deletions(-)

diff --git a/drivers/media/i2c/s5c73m3/s5c73m3-core.c b/drivers/media/i2c/s5c73m3/s5c73m3-core.c
index d96ba58ce1e5..77cba5f47364 100644
--- a/drivers/media/i2c/s5c73m3/s5c73m3-core.c
+++ b/drivers/media/i2c/s5c73m3/s5c73m3-core.c
@@ -10,12 +10,11 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/firmware.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/i2c.h>
 #include <linux/init.h>
 #include <linux/media.h>
 #include <linux/module.h>
-#include <linux/of_gpio.h>
 #include <linux/of_graph.h>
 #include <linux/regulator/consumer.h>
 #include <linux/sizes.h>
@@ -1347,22 +1346,26 @@ static int s5c73m3_oif_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
 	return 0;
 }
 
-static int s5c73m3_gpio_set_value(struct s5c73m3 *priv, int id, u32 val)
+static int s5c73m3_gpio_set_value(struct gpio_desc *gpio, int val)
 {
-	if (!gpio_is_valid(priv->gpio[id].gpio))
+	if (!gpio)
 		return 0;
-	gpio_set_value(priv->gpio[id].gpio, !!val);
+	gpiod_set_value(gpio, !!val);
 	return 1;
 }
 
-static int s5c73m3_gpio_assert(struct s5c73m3 *priv, int id)
+static int s5c73m3_gpio_assert(struct gpio_desc *gpio)
 {
-	return s5c73m3_gpio_set_value(priv, id, priv->gpio[id].level);
+	int val = gpiod_get_value(gpio);
+
+	return s5c73m3_gpio_set_value(gpio, val);
 }
 
-static int s5c73m3_gpio_deassert(struct s5c73m3 *priv, int id)
+static int s5c73m3_gpio_deassert(struct gpio_desc *gpio)
 {
-	return s5c73m3_gpio_set_value(priv, id, !priv->gpio[id].level);
+	int val = gpiod_get_value(gpio);
+
+	return s5c73m3_gpio_set_value(gpio, !val);
 }
 
 static int __s5c73m3_power_on(struct s5c73m3 *state)
@@ -1386,10 +1389,10 @@ static int __s5c73m3_power_on(struct s5c73m3 *state)
 	v4l2_dbg(1, s5c73m3_dbg, &state->oif_sd, "clock frequency: %ld\n",
 					clk_get_rate(state->clock));
 
-	s5c73m3_gpio_deassert(state, STBY);
+	s5c73m3_gpio_deassert(state->gpio_stby);
 	usleep_range(100, 200);
 
-	s5c73m3_gpio_deassert(state, RSET);
+	s5c73m3_gpio_deassert(state->gpio_reset);
 	usleep_range(50, 100);
 
 	return 0;
@@ -1404,10 +1407,10 @@ static int __s5c73m3_power_off(struct s5c73m3 *state)
 {
 	int i, ret;
 
-	if (s5c73m3_gpio_assert(state, RSET))
+	if (s5c73m3_gpio_assert(state->gpio_reset))
 		usleep_range(10, 50);
 
-	if (s5c73m3_gpio_assert(state, STBY))
+	if (s5c73m3_gpio_assert(state->gpio_stby))
 		usleep_range(100, 200);
 
 	clk_disable_unprepare(state->clock);
@@ -1545,50 +1548,34 @@ static const struct v4l2_subdev_ops oif_subdev_ops = {
 
 static int s5c73m3_configure_gpios(struct s5c73m3 *state)
 {
-	static const char * const gpio_names[] = {
-		"S5C73M3_STBY", "S5C73M3_RST"
-	};
 	struct i2c_client *c = state->i2c_client;
-	struct s5c73m3_gpio *g = state->gpio;
-	int ret, i;
+	struct device *dev = &c->dev;
+	struct device_node *np = dev->of_node;
 
-	for (i = 0; i < GPIO_NUM; ++i) {
-		unsigned int flags = GPIOF_DIR_OUT;
-		if (g[i].level)
-			flags |= GPIOF_INIT_HIGH;
-		ret = devm_gpio_request_one(&c->dev, g[i].gpio, flags,
-					    gpio_names[i]);
-		if (ret) {
-			v4l2_err(c, "failed to request gpio %s\n",
-				 gpio_names[i]);
-			return ret;
-		}
+	state->gpio_stby = gpiod_get_from_of_node(np, "standby-gpios", 0, GPIOD_ASIS,
+			"S5C73M3_STBY");
+
+	if (IS_ERR(state->gpio_stby)) {
+		v4l2_err(c, "failed to request gpio S5C73M3_STBY");
+		return PTR_ERR(state->gpio_stby);
 	}
-	return 0;
-}
 
-static int s5c73m3_parse_gpios(struct s5c73m3 *state)
-{
-	static const char * const prop_names[] = {
-		"standby-gpios", "xshutdown-gpios",
-	};
-	struct device *dev = &state->i2c_client->dev;
-	struct device_node *node = dev->of_node;
-	int ret, i;
+	if (state->gpio_stby)
+		gpiod_direction_output(state->gpio_stby,
+				!gpiod_is_active_low(state->gpio_stby));
 
-	for (i = 0; i < GPIO_NUM; ++i) {
-		enum of_gpio_flags of_flags;
+	state->gpio_reset = gpiod_get_from_of_node(np, "xshutdown-gpios", 0, GPIOD_ASIS,
+			"S5C73M3_RST");
 
-		ret = of_get_named_gpio_flags(node, prop_names[i],
-					      0, &of_flags);
-		if (ret < 0) {
-			dev_err(dev, "failed to parse %s DT property\n",
-				prop_names[i]);
-			return -EINVAL;
-		}
-		state->gpio[i].gpio = ret;
-		state->gpio[i].level = !(of_flags & OF_GPIO_ACTIVE_LOW);
+	if (IS_ERR(state->gpio_reset)) {
+		v4l2_err(c, "failed to request gpio S5C73M3_RST");
+		return PTR_ERR(state->gpio_reset);
 	}
+
+	if (state->gpio_reset)
+		gpiod_direction_output(state->gpio_reset,
+				!gpiod_is_active_low(state->gpio_reset));
+
 	return 0;
 }
 
@@ -1608,8 +1595,8 @@ static int s5c73m3_get_platform_data(struct s5c73m3 *state)
 		}
 
 		state->mclk_frequency = pdata->mclk_frequency;
-		state->gpio[STBY] = pdata->gpio_stby;
-		state->gpio[RSET] = pdata->gpio_reset;
+		state->gpio_stby = pdata->gpio_stby;
+		state->gpio_reset = pdata->gpio_reset;
 		return 0;
 	}
 
@@ -1624,10 +1611,6 @@ static int s5c73m3_get_platform_data(struct s5c73m3 *state)
 					state->mclk_frequency);
 	}
 
-	ret = s5c73m3_parse_gpios(state);
-	if (ret < 0)
-		return -EINVAL;
-
 	node_ep = of_graph_get_next_endpoint(node, NULL);
 	if (!node_ep) {
 		dev_warn(dev, "no endpoint defined for node: %pOF\n", node);
diff --git a/drivers/media/i2c/s5c73m3/s5c73m3.h b/drivers/media/i2c/s5c73m3/s5c73m3.h
index c3fcfdd3ea66..f0056ae6e51a 100644
--- a/drivers/media/i2c/s5c73m3/s5c73m3.h
+++ b/drivers/media/i2c/s5c73m3/s5c73m3.h
@@ -351,12 +351,6 @@ struct s5c73m3_ctrls {
 	struct v4l2_ctrl *scene_mode;
 };
 
-enum s5c73m3_gpio_id {
-	STBY,
-	RSET,
-	GPIO_NUM,
-};
-
 enum s5c73m3_resolution_types {
 	RES_ISP,
 	RES_JPEG,
@@ -383,7 +377,8 @@ struct s5c73m3 {
 	u32 i2c_read_address;
 
 	struct regulator_bulk_data supplies[S5C73M3_MAX_SUPPLIES];
-	struct s5c73m3_gpio gpio[GPIO_NUM];
+	struct gpio_desc *gpio_stby;
+	struct gpio_desc *gpio_reset;
 
 	struct clk *clock;
 
diff --git a/include/media/i2c/s5c73m3.h b/include/media/i2c/s5c73m3.h
index a51f1025ba1c..caad855a8394 100644
--- a/include/media/i2c/s5c73m3.h
+++ b/include/media/i2c/s5c73m3.h
@@ -17,19 +17,10 @@
 #ifndef MEDIA_S5C73M3__
 #define MEDIA_S5C73M3__
 
+#include <linux/gpio/consumer.h>
 #include <linux/videodev2.h>
 #include <media/v4l2-mediabus.h>
 
-/**
- * struct s5c73m3_gpio - data structure describing a GPIO
- * @gpio:  GPIO number
- * @level: indicates active state of the @gpio
- */
-struct s5c73m3_gpio {
-	int gpio;
-	int level;
-};
-
 /**
  * struct s5c73m3_platform_data - s5c73m3 driver platform data
  * @mclk_frequency: sensor's master clock frequency in Hz
@@ -44,8 +35,8 @@ struct s5c73m3_gpio {
 struct s5c73m3_platform_data {
 	unsigned long mclk_frequency;
 
-	struct s5c73m3_gpio gpio_reset;
-	struct s5c73m3_gpio gpio_stby;
+	struct gpio_desc *gpio_reset;
+	struct gpio_desc *gpio_stby;
 
 	enum v4l2_mbus_type bus_type;
 	u8 nlanes;
-- 
2.38.1