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

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Date:   Mon, 13 Mar 2023 10:26:23 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: Use of_property_present() for testing DT property presence

On Fri, 10 Mar 2023 at 22:47, 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>
> ---
>  drivers/clk/clk.c         | 4 ++--
>  drivers/clk/sprd/common.c | 2 +-

For sprd clk:
Acked-by: Chunyan Zhang <zhang.lyra@...il.com>

Thanks,
Chunyan

>  2 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index ae07685c7588..f7528d7f8256 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -4880,8 +4880,8 @@ static struct device_node *get_clk_provider_node(struct device *dev)
>         np = dev->of_node;
>         parent_np = dev->parent ? dev->parent->of_node : NULL;
>
> -       if (!of_find_property(np, "#clock-cells", NULL))
> -               if (of_find_property(parent_np, "#clock-cells", NULL))
> +       if (!of_property_present(np, "#clock-cells"))
> +               if (of_property_present(parent_np, "#clock-cells"))
>                         np = parent_np;
>
>         return np;
> diff --git a/drivers/clk/sprd/common.c b/drivers/clk/sprd/common.c
> index ce81e4087a8f..1a3795a61f81 100644
> --- a/drivers/clk/sprd/common.c
> +++ b/drivers/clk/sprd/common.c
> @@ -44,7 +44,7 @@ int sprd_clk_regmap_init(struct platform_device *pdev,
>         struct device_node *node = dev->of_node, *np;
>         struct regmap *regmap;
>
> -       if (of_find_property(node, "sprd,syscon", NULL)) {
> +       if (of_property_present(node, "sprd,syscon")) {
>                 regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
>                 if (IS_ERR(regmap)) {
>                         pr_err("%s: failed to get syscon regmap\n", __func__);
> --
> 2.39.2
>