linux-kernel - Re: [PATCH v2 4/8] PM / devfreq: exynos-ppmu: Show the registred device for ppmu device

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Date:   Fri, 30 Dec 2016 19:35:00 +0900
From:   MyungJoo Ham <myungjoo.ham@...sung.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>
Cc:     Kyungmin Park <kyungmin.park@...sung.com>, chanwoo@...nel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM list <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Linux Samsung SoC <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH v2 4/8] PM / devfreq: exynos-ppmu: Show the registred
 device for ppmu device

On Wed, Dec 28, 2016 at 8:56 PM, Chanwoo Choi <cw00.choi@...sung.com> wrote:
> This patch just adds the simple log to show the PPMU device's registration
> during the kernel booting.
>
> Cc: Kukjin Kim <kgene@...nel.org>
> Cc: Krzysztof Kozlowski <krzk@...nel.org>
> Cc: Javier Martinez Canillas <javier@....samsung.com>
> Cc: linux-samsung-soc@...r.kernel.org
> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> ---
>  drivers/devfreq/event/exynos-ppmu.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/devfreq/event/exynos-ppmu.c b/drivers/devfreq/event/exynos-ppmu.c
> index fb3706faf5bd..9b5294d0bff4 100644
> --- a/drivers/devfreq/event/exynos-ppmu.c
> +++ b/drivers/devfreq/event/exynos-ppmu.c
> @@ -591,7 +591,7 @@ static int exynos_ppmu_parse_dt(struct platform_device *pdev,
>         info->ppmu.clk = devm_clk_get(dev, "ppmu");
>         if (IS_ERR(info->ppmu.clk)) {
>                 info->ppmu.clk = NULL;
> -               dev_warn(dev, "cannot get PPMU clock\n");
> +               dev_dbg(dev, "cannot get PPMU clock\n");

Do you really want not to emit warning with a clock not found?

>         }
>
>         ret = of_get_devfreq_events(np, info);
> @@ -643,6 +643,9 @@ static int exynos_ppmu_probe(struct platform_device *pdev)
>                                 "failed to add devfreq-event device\n");
>                         return PTR_ERR(edev[i]);
>                 }
> +
> +               pr_info("exynos-ppmu: new PPMU device registered %s (%s)\n",
> +                       dev_name(&pdev->dev), desc[i].name);
>         }
>
>         clk_prepare_enable(info->ppmu.clk);
> --
> 1.9.1
>
> --
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-- 
MyungJoo Ham, Ph.D.
S/W Center, Samsung Electronics