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

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Message-ID: <CAPDyKFoVUQEmseNT+dZFJDfwh7ijTwUs5_NckpZLhRQ=VuFpFQ@mail.gmail.com>
Date:   Fri, 10 Mar 2023 18:46:59 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Rob Herring <robh@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>, devicetree@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH] cpuidle: Use of_property_present() for testing DT
 property presence

On Fri, 10 Mar 2023 at 15:47, 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>

Acked-by: Ulf Hansson <ulf.hansson@...aro.org>

Rafael, can you please pick this via your tree.

Kind regards
Uffe

> ---
>  drivers/cpuidle/cpuidle-psci-domain.c | 2 +-
>  drivers/cpuidle/cpuidle-riscv-sbi.c   | 6 +++---
>  2 files changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/cpuidle/cpuidle-psci-domain.c b/drivers/cpuidle/cpuidle-psci-domain.c
> index 6ad2954948a5..e875ddadc51b 100644
> --- a/drivers/cpuidle/cpuidle-psci-domain.c
> +++ b/drivers/cpuidle/cpuidle-psci-domain.c
> @@ -165,7 +165,7 @@ static int psci_cpuidle_domain_probe(struct platform_device *pdev)
>          * initialize a genpd/genpd-of-provider pair when it's found.
>          */
>         for_each_child_of_node(np, node) {
> -               if (!of_find_property(node, "#power-domain-cells", NULL))
> +               if (!of_property_present(node, "#power-domain-cells"))
>                         continue;
>
>                 ret = psci_pd_init(node, use_osi);
> diff --git a/drivers/cpuidle/cpuidle-riscv-sbi.c b/drivers/cpuidle/cpuidle-riscv-sbi.c
> index be383f4b6855..1fab1abc6eb6 100644
> --- a/drivers/cpuidle/cpuidle-riscv-sbi.c
> +++ b/drivers/cpuidle/cpuidle-riscv-sbi.c
> @@ -497,7 +497,7 @@ static int sbi_genpd_probe(struct device_node *np)
>          * initialize a genpd/genpd-of-provider pair when it's found.
>          */
>         for_each_child_of_node(np, node) {
> -               if (!of_find_property(node, "#power-domain-cells", NULL))
> +               if (!of_property_present(node, "#power-domain-cells"))
>                         continue;
>
>                 ret = sbi_pd_init(node);
> @@ -548,8 +548,8 @@ static int sbi_cpuidle_probe(struct platform_device *pdev)
>         for_each_possible_cpu(cpu) {
>                 np = of_cpu_device_node_get(cpu);
>                 if (np &&
> -                   of_find_property(np, "power-domains", NULL) &&
> -                   of_find_property(np, "power-domain-names", NULL)) {
> +                   of_property_present(np, "power-domains") &&
> +                   of_property_present(np, "power-domain-names")) {
>                         continue;
>                 } else {
>                         sbi_cpuidle_use_osi = false;
> --
> 2.39.2
>