linux-kernel - Re: [PATCH] gpio: mt7621: support gpio-line-names property

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Message-ID: <CAHp75Vd4UPiPKy98jV_LuCE10dCrSwU06AddCq5Q0POm0graOw@mail.gmail.com>
Date:   Sun, 27 Jun 2021 12:31:35 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Sergio Paracuellos <sergio.paracuellos@...il.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        git@...nthomson.fastmail.com.au,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        neil@...wn.name, opensource@...rst.com,
        Nicholas Mc Guire <hofrat@...dl.org>
Subject: Re: [PATCH] gpio: mt7621: support gpio-line-names property

On Sat, Jun 19, 2021 at 1:02 PM Sergio Paracuellos
<sergio.paracuellos@...il.com> wrote:
>
> The default handling of the gpio-line-names property by the
> gpiolib-of implementation does not work with the multiple
> gpiochip banks per device structure used by the gpio-mt7621
> driver.
>
> This commit adds driver level support for the device tree
> property so that GPIO lines can be assigned friendly names.

...

> +static void
> +mediatek_gpio_set_names(struct device *dev, struct mtk_gc *rg)
> +{
> +       struct device_node *np = dev->of_node;
> +       const char **names;
> +       int nstrings, base;
> +       unsigned int i;
> +
> +       names = devm_kcalloc(dev, MTK_BANK_WIDTH, sizeof(*names),
> +                            GFP_KERNEL);
> +       if (!names)
> +               return;
> +
> +       base = rg->bank * MTK_BANK_WIDTH;
> +       nstrings = of_property_count_strings(np, "gpio-line-names");
> +       if (nstrings <= base)
> +               goto assign_names;
> +
> +       for (i = 0; i < MTK_BANK_WIDTH; i++) {
> +               const char *name;
> +               int ret;
> +
> +               ret = of_property_read_string_index(np, "gpio-line-names",
> +                                                   base + i, &name);
> +               if (ret) {
> +                       if (ret != -ENODATA)
> +                               dev_err(dev, "unable to name line %d: %d\n",
> +                                       base + i, ret);
> +                       break;
> +               }
> +
> +               if (*name)
> +                       names[i] = name;
> +       }
> +
> +assign_names:
> +       rg->chip.names = names;
> +}

Any idea why it's not a duplicate of
https://elixir.bootlin.com/linux/v5.13-rc7/C/ident/devprop_gpiochip_set_names,
and why the latter is not called in your case?

-- 
With Best Regards,
Andy Shevchenko