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Date: Thu, 17 Nov 2022 12:06:53 +0100
From: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Andrzej Hajda <andrzej.hajda@...el.com>,
Linus Walleij <linus.walleij@...aro.org>,
linux-kernel@...r.kernel.org, linux-media@...r.kernel.org
Subject: Re: [PATCH 4/4] media: i2c: s5c73m3: switch to using gpiod API
On Tue, Nov 15, 2022 at 02:11:45PM -0800, Dmitry Torokhov wrote:
> This patch switches the driver away from legacy gpio/of_gpio API to
> gpiod API, and removes use of of_get_named_gpio_flags() which I want to
> make private to gpiolib.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> drivers/media/i2c/s5c73m3/s5c73m3-core.c | 63 +++++++-----------------
> drivers/media/i2c/s5c73m3/s5c73m3.h | 7 +--
> 2 files changed, 20 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/media/i2c/s5c73m3/s5c73m3-core.c b/drivers/media/i2c/s5c73m3/s5c73m3-core.c
> index 561c1a1583ac..f1e073ed5f99 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>
> @@ -1348,20 +1347,20 @@ static int s5c73m3_oif_open(struct v4l2_subdev *sd, struct v4l2_subdev_fh *fh)
>
> static int s5c73m3_gpio_set_value(struct s5c73m3 *priv, int id, u32 val)
> {
> - if (!gpio_is_valid(priv->gpio[id].gpio))
> + if (!priv->gpio[id])
> return 0;
> - gpio_set_value(priv->gpio[id].gpio, !!val);
> + gpiod_set_value_cansleep(priv->gpio[id], val);
> return 1;
> }
>
> static int s5c73m3_gpio_assert(struct s5c73m3 *priv, int id)
> {
> - return s5c73m3_gpio_set_value(priv, id, priv->gpio[id].level);
> + return s5c73m3_gpio_set_value(priv, id, 1);
> }
>
> static int s5c73m3_gpio_deassert(struct s5c73m3 *priv, int id)
> {
> - return s5c73m3_gpio_set_value(priv, id, !priv->gpio[id].level);
> + return s5c73m3_gpio_set_value(priv, id, 0);
> }
>
> static int __s5c73m3_power_on(struct s5c73m3 *state)
> @@ -1544,49 +1543,29 @@ 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"
> - };
> + static const char * const name[] = { "standby", "xshutdown" };
> + static const char * const label[] = { "S5C73M3_STBY", "S5C73M3_RST" };
> struct i2c_client *c = state->i2c_client;
> - struct s5c73m3_gpio *g = state->gpio;
> + struct gpio_desc *gpio;
> int ret, i;
>
> 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]);
> + gpio = devm_gpiod_get(&c->dev, name[i], GPIOD_OUT_HIGH);
> + ret = PTR_ERR_OR_ZERO(gpio);
> if (ret) {
> - v4l2_err(c, "failed to request gpio %s\n",
> - gpio_names[i]);
> + v4l2_err(c, "failed to request gpio %s: %d\n",
> + name[i], ret);
> return ret;
> }
> - }
> - 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;
>
> - for (i = 0; i < GPIO_NUM; ++i) {
> - enum of_gpio_flags of_flags;
> -
> - 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;
> + ret = gpiod_set_consumer_name(gpio, label[i]);
> + if (ret) {
> + v4l2_err(c, "failed to set up name for gpio %s: %d\n",
> + name[i], ret);
> + return ret;
> }
> - state->gpio[i].gpio = ret;
> - state->gpio[i].level = !(of_flags & OF_GPIO_ACTIVE_LOW);
> +
> + state->gpio[i] = gpio;
> }
> return 0;
> }
> @@ -1613,10 +1592,6 @@ static int s5c73m3_get_dt_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 d68528898249..9887d03fcdeb 100644
> --- a/drivers/media/i2c/s5c73m3/s5c73m3.h
> +++ b/drivers/media/i2c/s5c73m3/s5c73m3.h
> @@ -356,11 +356,6 @@ enum s5c73m3_gpio_id {
> GPIO_NUM,
> };
>
> -struct s5c73m3_gpio {
> - int gpio;
> - int level;
> -};
> -
> enum s5c73m3_resolution_types {
> RES_ISP,
> RES_JPEG,
> @@ -387,7 +382,7 @@ struct s5c73m3 {
> u32 i2c_read_address;
>
> struct regulator_bulk_data supplies[S5C73M3_MAX_SUPPLIES];
> - struct s5c73m3_gpio gpio[GPIO_NUM];
> + struct gpio_desc *gpio[GPIO_NUM];
>
> struct clk *clock;
>
> --
> 2.38.1.431.g37b22c650d-goog
>
Looks good to me.
Reviewed-by: Tommaso Merciai <tommaso.merciai@...rulasolutions.com>
--
Tommaso Merciai
Embedded Linux Engineer
tommaso.merciai@...rulasolutions.com
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