linux-kernel - Re: [PATCH v4 8/8] PM / devfreq: exynos-bus: Register cooling device

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Date:   Wed, 18 Oct 2017 00:11:47 +0900
From:   MyungJoo Ham <myungjoo.ham@...sung.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Kyungmin Park <kyungmin.park@...sung.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        chanwoo@...nel.org,
        대인기 <inki.dae@...sung.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Linux Samsung SoC <linux-samsung-soc@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 8/8] PM / devfreq: exynos-bus: Register cooling device

On Fri, Oct 13, 2017 at 4:48 PM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
> This patch registers the Exynos Bus-Frequency scaling device
> as a cooling device of thermal management.
>
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> Cc: Kukjin Kim <kgene@...nel.org>
> Cc: Krzysztof Kozlowski <krzk@...nel.org>
> Cc: linux-samsung-soc@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org

I've got a question below.

> ---
>  drivers/devfreq/exynos-bus.c | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
>
> diff --git a/drivers/devfreq/exynos-bus.c b/drivers/devfreq/exynos-bus.c
> index c25658b26598..1c7521b65c2f 100644
[]> @@ -468,6 +471,19 @@ static int exynos_bus_probe(struct
platform_device *pdev)
>                 goto err;
>         }
>
> +       /*
> +        * Register devfreq cooling device if thermal DT code
> +        * takes care of matching them.
> +        */
> +       if (of_find_property(np, "#cooling-cells", NULL)) {
> +               bus->cdev = of_devfreq_cooling_register(np, bus->devfreq);
> +               if (IS_ERR(bus->cdev)) {
> +                       dev_err(dev, "running exynos-bus without cooling device\n");
> +                       bus->cdev = NULL;
> +               }
> +       }
> +       of_node_put(np);

Is this of_node_put() is a pair of of_find_property? or for something else?
(do you need to call put for of_find_property? or for something else?
I'm not seeing a function with "get")


Cheers,
MyungJoo