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Date: Mon, 28 Nov 2022 09:40:21 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Maíra Canal <mairacanal@...eup.net>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Andrzej Hajda <andrzej.hajda@...el.com>
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
linux-media@...r.kernel.org
Subject: Re: [PATCH 1/2] media: s5c73m3: Replace legacy gpio interface for
gpiod
Hi Maíra,
I'm skipping your patch in favor of a similar patch from Linux Walleij:
https://patchwork.linuxtv.org/project/linux-media/patch/20221108100604.1500909-1-linus.walleij@linaro.org/
I will take your 2/2 patch, though. That looks good.
Regards,
Hans
On 16/11/2022 20:43, Maíra Canal wrote:
> 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@...eup.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;
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