linux-kernel - Re: [PATCH] pinctrl: Use of_property_present() for testing DT property presence

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Date:   Mon, 13 Mar 2023 10:00:48 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Sean Wang <sean.wang@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Tony Lindgren <tony@...mide.com>,
        Haojian Zhuang <haojian.zhuang@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        devicetree@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-renesas-soc@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH] pinctrl: Use of_property_present() for testing DT
 property presence

Hi Rob,

On Fri, Mar 10, 2023 at 3:56 PM Rob Herring <robh@...nel.org> wrote:
> It is preferred to use typed property access functions (i.e.
> of_property_read_<type> functions) rather than low-level
> of_get_property/of_find_property functions for reading properties. As
> part of this, convert of_get_property/of_find_property calls to the
> recently added of_property_present() helper when we just want to test
> for presence of a property and nothing more.
>
> Signed-off-by: Rob Herring <robh@...nel.org>

Thanks for your patch!

> --- a/drivers/pinctrl/renesas/pinctrl.c
> +++ b/drivers/pinctrl/renesas/pinctrl.c
> @@ -125,8 +125,8 @@ static int sh_pfc_dt_subnode_to_map(struct pinctrl_dev *pctldev,
>          * inside a subnode nor across subnodes.
>          */
>         if (!pmx->func_prop_name) {
> -               if (of_find_property(np, "groups", NULL) ||
> -                   of_find_property(np, "pins", NULL)) {
> +               if (of_property_present(np, "groups")||
> +                   of_property_present(np, "pins")) {
>                         pmx->func_prop_name = "function";
>                         pmx->groups_prop_name = "groups";
>                         pmx->pins_prop_name = "pins";

Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

This check is used to auto-detect if the standard property names
should be used, or the "renesas,"-prefixed ones.
As the last users of the latter were removed from DTS in v4.10,
perhaps I should just remove these checks instead?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds