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

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Date:   Mon, 5 Feb 2018 15:06:33 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Ludovic Desroches <ludovic.desroches@...rochip.com>
Cc:     linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [RESEND][PATCH] video: fbdev: atmel_lcdfb: convert to use GPIO descriptors

On Mon, Feb 5, 2018 at 10:47 AM, Ludovic Desroches
<ludovic.desroches@...rochip.com> wrote:
> Use GPIO descriptors instead of relying on the old method.

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

Though few nitpicks below.


> --- 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>

I think you forgot to remove of_gpio.h.

>  #include <linux/module.h>
>  #include <linux/of.h>
>  #include <linux/of_device.h>

>         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;

I would rather preserve reversed tree style, i.e. put longer line upper.


> +       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;

What about IS_ERR() case?

>
>                 og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
>                 if (!og)
>                         goto put_display_node;
>
> +               og->gpiod = gpiod;
>                 is_gpio_power = true;
>
> +               ret = gpiod_direction_output(gpiod, gpiod_is_active_low(gpiod));
>                 if (ret) {

I'm not sure this will be needed if you check IS_ERR() above.

> +                       dev_err(dev, "set direction output gpio atmel,power-control[%d] failed\n", i);
>                         goto put_display_node;
>                 }


-- 
With Best Regards,
Andy Shevchenko