linux-kernel - Re: [PATCH 1/2] rtc: mxc: add a second clock

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Message-ID: <20150528115731.GN2185@piout.net>
Date:	Thu, 28 May 2015 13:57:31 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Philippe Reynes <tremyfr@...il.com>
Cc:	shawn.guo@...aro.org, kernel@...gutronix.de,
	linux@....linux.org.uk, a.zummo@...ertech.it, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	rtc-linux@...glegroups.com, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	fabio.estevam@...escale.com
Subject: Re: [PATCH 1/2] rtc: mxc: add a second clock

Hi,

On 16/05/2015 at 00:35:29 +0200, Philippe Reynes wrote :
> The mxc RTC needs two clocks, one for the input
> reference, and one for the IP. But this driver
> was only using one clock (for the reference).
> This patch add the second clock (for the IP).
> 
> Signed-off-by: Philippe Reynes <tremyfr@...il.com>
> ---
>  arch/arm/mach-imx/clk-imx31.c |    3 ++-
>  drivers/rtc/rtc-mxc.c         |   26 +++++++++++++++++---------
>  2 files changed, 19 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/arm/mach-imx/clk-imx31.c b/arch/arm/mach-imx/clk-imx31.c
> index 286ef42..480c54f 100644
> --- a/arch/arm/mach-imx/clk-imx31.c
> +++ b/arch/arm/mach-imx/clk-imx31.c
> @@ -130,7 +130,8 @@ int __init mx31_clocks_init(unsigned long fref)
>  	clk_register_clkdev(clk[cspi3_gate], NULL, "imx31-cspi.2");
>  	clk_register_clkdev(clk[pwm_gate], "pwm", NULL);
>  	clk_register_clkdev(clk[wdog_gate], NULL, "imx2-wdt.0");
> -	clk_register_clkdev(clk[rtc_gate], NULL, "imx21-rtc");
> +	clk_register_clkdev(clk[ckil], "rtc", "imx21-rtc");
> +	clk_register_clkdev(clk[rtc_gate], "ipg", "imx21-rtc");
>  	clk_register_clkdev(clk[epit1_gate], "epit", NULL);
>  	clk_register_clkdev(clk[epit2_gate], "epit", NULL);
>  	clk_register_clkdev(clk[nfc], NULL, "imx27-nand.0");

This should probably go in a separate patch so that Shawn can apply it.


> diff --git a/drivers/rtc/rtc-mxc.c b/drivers/rtc/rtc-mxc.c
> index 09d422b..e916a91 100644
> --- a/drivers/rtc/rtc-mxc.c
> +++ b/drivers/rtc/rtc-mxc.c
> @@ -79,7 +79,8 @@ struct rtc_plat_data {
>  	struct rtc_device *rtc;
>  	void __iomem *ioaddr;
>  	int irq;
> -	struct clk *clk;
> +	struct clk *clk_rtc;
> +	struct clk *clk_ipg;
>  	struct rtc_time g_rtc_alarm;
>  	enum imx_rtc_type devtype;
>  };
> @@ -373,17 +374,24 @@ static int mxc_rtc_probe(struct platform_device *pdev)
>  	if (IS_ERR(pdata->ioaddr))
>  		return PTR_ERR(pdata->ioaddr);
>  
> -	pdata->clk = devm_clk_get(&pdev->dev, NULL);
> -	if (IS_ERR(pdata->clk)) {
> -		dev_err(&pdev->dev, "unable to get clock!\n");
> -		return PTR_ERR(pdata->clk);
> +	pdata->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
> +	if (IS_ERR(pdata->clk_ipg)) {
> +		dev_err(&pdev->dev, "unable to get ipg clock!\n");
> +		return PTR_ERR(pdata->clk_ipg);
>  	}
>  
> -	ret = clk_prepare_enable(pdata->clk);
> +	ret = clk_prepare_enable(pdata->clk_ipg);
>  	if (ret)
>  		return ret;
>  
> -	rate = clk_get_rate(pdata->clk);
> +	pdata->clk_rtc = devm_clk_get(&pdev->dev, "rtc");
> +	if (IS_ERR(pdata->clk_rtc)) {
> +		dev_err(&pdev->dev, "unable to get rtc clock!\n");
> +		ret = PTR_ERR(pdata->clk_rtc);
> +		goto exit_put_clk;
> +	}
> +
> +	rate = clk_get_rate(pdata->clk_rtc);

You are getting the rate but don't you need to clk_prepare_enable()?

Also, aren't those devm_clk_get now failing on i.mx35? Maybe it was
already failing before that patch as I don't see any rtc clock being
registeres in clk-imx35.c

>  
>  	if (rate == 32768)
>  		reg = RTC_INPUT_CLK_32768HZ;
> @@ -432,7 +440,7 @@ static int mxc_rtc_probe(struct platform_device *pdev)
>  	return 0;
>  
>  exit_put_clk:
> -	clk_disable_unprepare(pdata->clk);
> +	clk_disable_unprepare(pdata->clk_ipg);
>  
>  	return ret;
>  }
> @@ -441,7 +449,7 @@ static int mxc_rtc_remove(struct platform_device *pdev)
>  {
>  	struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
>  
> -	clk_disable_unprepare(pdata->clk);
> +	clk_disable_unprepare(pdata->clk_ipg);
>  
>  	return 0;
>  }
> -- 
> 1.7.4.4
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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