linux-kernel - Re: [PATCH] drivers: rtc: fix s3c-rtc initialization failure without rtc source clock

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Message-id: <543F2CA0.3080703@samsung.com>
Date:	Thu, 16 Oct 2014 11:25:36 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Kukjin Kim <kgene.kim@...sung.com>
Subject: Re: [PATCH] drivers: rtc: fix s3c-rtc initialization failure without
 rtc source clock

On 10/15/2014 08:27 PM, Marek Szyprowski wrote:
> This patch fixes unconditional initialization failure on non-exynos3250
> SoCs. Commit df9e26d093d33a097c5558aab017dd2f540ccfe5 ("rtc: s3c: add support for RTC of Exynos3250 SoC") introduced rtc source clock support,
> but also added initialization failure on SoCs, which doesn't need such
> clock.
> 
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
> ---
>  drivers/rtc/rtc-s3c.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
> index a6b1252c9941..806072238c00 100644
> --- a/drivers/rtc/rtc-s3c.c
> +++ b/drivers/rtc/rtc-s3c.c
> @@ -535,13 +535,15 @@ static int s3c_rtc_probe(struct platform_device *pdev)
>  	}
>  	clk_prepare_enable(info->rtc_clk);
>  
> -	info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
> -	if (IS_ERR(info->rtc_src_clk)) {
> -		dev_err(&pdev->dev, "failed to find rtc source clock\n");
> -		return PTR_ERR(info->rtc_src_clk);
> +	if (info->data->needs_src_clk) {
> +		info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src");
> +		if (IS_ERR(info->rtc_src_clk)) {
> +			dev_err(&pdev->dev,
> +				"failed to find rtc source clock\n");
> +			return PTR_ERR(info->rtc_src_clk);
> +		}
> +		clk_prepare_enable(info->rtc_src_clk);
>  	}
> -	clk_prepare_enable(info->rtc_src_clk);
> -
>  
>  	/* check to see if everything is setup correctly */
>  	if (info->data->enable)
> 

Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>

Thanks,
Chanwoo Choi

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