linux-kernel - Re: [PATCH] video: fbdev: convert to use GPIO descriptors

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Message-ID: <ac7174c4-e213-1f14-4cf7-1701c0f8b452@microchip.com>
Date:   Mon, 5 Feb 2018 10:15:21 +0100
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     Ludovic Desroches <ludovic.desroches@...rochip.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-fbdev@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>
CC:     <alexandre.belloni@...e-electrons.com>,
        <linux-kernel@...r.kernel.org>, <linus.walleij@...aro.org>,
        <b.zolnierkie@...sung.com>
Subject: Re: [PATCH] video: fbdev: convert to use GPIO descriptors

On 05/02/2018 at 09:23, Ludovic Desroches wrote:
> Use GPIO descriptors instead of relying on the old method.
> 
> Signed-off-by: Ludovic Desroches <ludovic.desroches@...rochip.com>

Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

Thanks!

> ---
>  drivers/video/fbdev/atmel_lcdfb.c | 30 ++++++++++++------------------
>  1 file changed, 12 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/video/fbdev/atmel_lcdfb.c b/drivers/video/fbdev/atmel_lcdfb.c
> index 3dee267d7c75..ef3d4198014f 100644
> --- a/drivers/video/fbdev/atmel_lcdfb.c
> +++ b/drivers/video/fbdev/atmel_lcdfb.c
> @@ -18,6 +18,7 @@
>  #include <linux/delay.h>
>  #include <linux/backlight.h>
>  #include <linux/gfp.h>
> +#include <linux/gpio/consumer.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>
> @@ -61,8 +62,7 @@ struct atmel_lcdfb_info {
>  };
>  
>  struct atmel_lcdfb_power_ctrl_gpio {
> -	int gpio;
> -	int active_low;
> +	struct gpio_desc *gpiod;
>  
>  	struct list_head list;
>  };
> @@ -1018,7 +1018,7 @@ static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int
>  	struct atmel_lcdfb_power_ctrl_gpio *og;
>  
>  	list_for_each_entry(og, &pdata->pwr_gpios, list)
> -		gpio_set_value(og->gpio, on);
> +		gpiod_set_value(og->gpiod, on);
>  }
>  
>  static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
> @@ -1031,11 +1031,11 @@ static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
>  	struct device_node *display_np;
>  	struct device_node *timings_np;
>  	struct display_timings *timings;
> -	enum of_gpio_flags flags;
>  	struct atmel_lcdfb_power_ctrl_gpio *og;
>  	bool is_gpio_power = false;
>  	int ret = -ENOENT;
> -	int i, gpio;
> +	int i;
> +	struct gpio_desc *gpiod;
>  
>  	sinfo->config = (struct atmel_lcdfb_config*)
>  		of_match_device(atmel_lcdfb_dt_ids, dev)->data;
> @@ -1072,28 +1072,22 @@ static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
>  
>  	INIT_LIST_HEAD(&pdata->pwr_gpios);
>  	ret = -ENOMEM;
> -	for (i = 0; i < of_gpio_named_count(display_np, "atmel,power-control-gpio"); i++) {
> -		gpio = of_get_named_gpio_flags(display_np, "atmel,power-control-gpio",
> -					       i, &flags);
> -		if (gpio < 0)
> +	for (i = 0; i < gpiod_count(dev, "atmel,power-control"); i++) {
> +		gpiod = devm_gpiod_get_index_optional(dev,
> +				"atmel,power-control", i, GPIOD_ASIS);
> +		if (!gpiod)
>  			continue;
>  
>  		og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
>  		if (!og)
>  			goto put_display_node;
>  
> -		og->gpio = gpio;
> -		og->active_low = flags & OF_GPIO_ACTIVE_LOW;
> +		og->gpiod = gpiod;
>  		is_gpio_power = true;
> -		ret = devm_gpio_request(dev, gpio, "lcd-power-control-gpio");
> -		if (ret) {
> -			dev_err(dev, "request gpio %d failed\n", gpio);
> -			goto put_display_node;
> -		}
>  
> -		ret = gpio_direction_output(gpio, og->active_low);
> +		ret = gpiod_direction_output(gpiod, gpiod_is_active_low(gpiod));
>  		if (ret) {
> -			dev_err(dev, "set direction output gpio %d failed\n", gpio);
> +			dev_err(dev, "set direction output gpio atmel,power-control[%d] failed\n", i);
>  			goto put_display_node;
>  		}
>  		list_add(&og->list, &pdata->pwr_gpios);
> 


-- 
Nicolas Ferre