linux-kernel - Re: [PATCH 1/2] rtc: sun6i: let the core handle rtc range

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Message-ID: <20200402135750.GB625345@aptenodytes>
Date:   Thu, 2 Apr 2020 15:57:50 +0200
From:   Paul Kocialkowski <paul.kocialkowski@...tlin.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Maxime Ripard <mripard@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] rtc: sun6i: let the core handle rtc range

Hi,

On Mon 30 Mar 20, 22:12, Alexandre Belloni wrote:
> Let the rtc core check the date/time against the RTC range.
> 
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>

This was successfully:
Tested-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

Cheers,

Paul

> ---
>  drivers/rtc/rtc-sun6i.c | 25 ++++++++++---------------
>  1 file changed, 10 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c
> index 415a20a936e4..446ce38c1592 100644
> --- a/drivers/rtc/rtc-sun6i.c
> +++ b/drivers/rtc/rtc-sun6i.c
> @@ -108,7 +108,6 @@
>   * driver, even though it is somewhat limited.
>   */
>  #define SUN6I_YEAR_MIN				1970
> -#define SUN6I_YEAR_MAX				2033
>  #define SUN6I_YEAR_OFF				(SUN6I_YEAR_MIN - 1900)
>  
>  /*
> @@ -569,14 +568,6 @@ static int sun6i_rtc_settime(struct device *dev, struct rtc_time *rtc_tm)
>  	struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
>  	u32 date = 0;
>  	u32 time = 0;
> -	int year;
> -
> -	year = rtc_tm->tm_year + 1900;
> -	if (year < SUN6I_YEAR_MIN || year > SUN6I_YEAR_MAX) {
> -		dev_err(dev, "rtc only supports year in range %d - %d\n",
> -			SUN6I_YEAR_MIN, SUN6I_YEAR_MAX);
> -		return -EINVAL;
> -	}
>  
>  	rtc_tm->tm_year -= SUN6I_YEAR_OFF;
>  	rtc_tm->tm_mon += 1;
> @@ -585,7 +576,7 @@ static int sun6i_rtc_settime(struct device *dev, struct rtc_time *rtc_tm)
>  		SUN6I_DATE_SET_MON_VALUE(rtc_tm->tm_mon)  |
>  		SUN6I_DATE_SET_YEAR_VALUE(rtc_tm->tm_year);
>  
> -	if (is_leap_year(year))
> +	if (is_leap_year(rtc_tm->tm_year + SUN6I_YEAR_MIN))
>  		date |= SUN6I_LEAP_SET_VALUE(1);
>  
>  	time = SUN6I_TIME_SET_SEC_VALUE(rtc_tm->tm_sec)  |
> @@ -726,12 +717,16 @@ static int sun6i_rtc_probe(struct platform_device *pdev)
>  
>  	device_init_wakeup(&pdev->dev, 1);
>  
> -	chip->rtc = devm_rtc_device_register(&pdev->dev, "rtc-sun6i",
> -					     &sun6i_rtc_ops, THIS_MODULE);
> -	if (IS_ERR(chip->rtc)) {
> -		dev_err(&pdev->dev, "unable to register device\n");
> +	chip->rtc = devm_rtc_allocate_device(&pdev->dev);
> +	if (IS_ERR(chip->rtc))
>  		return PTR_ERR(chip->rtc);
> -	}
> +
> +	chip->rtc->ops = &sun6i_rtc_ops;
> +	chip->rtc->range_max = 2019686399LL; /* 2033-12-31 23:59:59 */
> +
> +	ret = rtc_register_device(chip->rtc);
> +	if (ret)
> +		return ret;
>  
>  	dev_info(&pdev->dev, "RTC enabled\n");
>  
> -- 
> 2.25.1
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com

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