linux-kernel - Re: [PATCH v3 3/5] gpio: syscon: Add support for a custom get operation

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Date:   Thu, 3 Oct 2019 10:24:22 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     linux-gpio <linux-gpio@...r.kernel.org>,
        linux-devicetree <devicetree@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 3/5] gpio: syscon: Add support for a custom get operation

pt., 27 wrz 2019 o 12:04 Paul Kocialkowski
<paul.kocialkowski@...tlin.com> napisał(a):
>
> Some drivers might need a custom get operation to match custom
> behavior implemented in the set operation.
>
> Add plumbing for supporting that.
>
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  drivers/gpio/gpio-syscon.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpio/gpio-syscon.c b/drivers/gpio/gpio-syscon.c
> index 31f332074d7d..05c537ed73f1 100644
> --- a/drivers/gpio/gpio-syscon.c
> +++ b/drivers/gpio/gpio-syscon.c
> @@ -43,8 +43,9 @@ struct syscon_gpio_data {
>         unsigned int    bit_count;
>         unsigned int    dat_bit_offset;
>         unsigned int    dir_bit_offset;
> -       void            (*set)(struct gpio_chip *chip,
> -                              unsigned offset, int value);
> +       int             (*get)(struct gpio_chip *chip, unsigned offset);
> +       void            (*set)(struct gpio_chip *chip, unsigned offset,
> +                              int value);

Why did you change this line? Doesn't seem necessary and pollutes the history.

Bart

>  };
>
>  struct syscon_gpio_priv {
> @@ -252,7 +253,7 @@ static int syscon_gpio_probe(struct platform_device *pdev)
>         priv->chip.label = dev_name(dev);
>         priv->chip.base = -1;
>         priv->chip.ngpio = priv->data->bit_count;
> -       priv->chip.get = syscon_gpio_get;
> +       priv->chip.get = priv->data->get ? : syscon_gpio_get;
>         if (priv->data->flags & GPIO_SYSCON_FEAT_IN)
>                 priv->chip.direction_input = syscon_gpio_dir_in;
>         if (priv->data->flags & GPIO_SYSCON_FEAT_OUT) {
> --
> 2.23.0
>