linux-kernel - Re: [PATCH 2/7] rtc: jz4740: switch to rtc_time64_to_tm/rtc_tm_to

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Date:   Fri, 26 Apr 2019 16:29:36 +0200
From:   Mathieu Malaterre <malat@...ian.org>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc:     linux-rtc@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>,
        linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/7] rtc: jz4740: switch to rtc_time64_to_tm/rtc_tm_to_time64

On Thu, Apr 18, 2019 at 12:00 PM Alexandre Belloni
<alexandre.belloni@...tlin.com> wrote:
>
> Call the 64bit versions of rtc_tm time conversion now that the range is
> enforced by the core.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
> ---
>  drivers/rtc/rtc-jz4740.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/rtc/rtc-jz4740.c b/drivers/rtc/rtc-jz4740.c
> index 079469627bd7..15b6832f3931 100644
> --- a/drivers/rtc/rtc-jz4740.c
> +++ b/drivers/rtc/rtc-jz4740.c
> @@ -171,7 +171,7 @@ static int jz4740_rtc_read_time(struct device *dev, struct rtc_time *time)
>         if (timeout == 0)
>                 return -EIO;
>
> -       rtc_time_to_tm(secs, time);
> +       rtc_time64_to_tm(secs, time);
>
>         return 0;
>  }
> @@ -196,7 +196,7 @@ static int jz4740_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
>         alrm->enabled = !!(ctrl & JZ_RTC_CTRL_AE);
>         alrm->pending = !!(ctrl & JZ_RTC_CTRL_AF);
>
> -       rtc_time_to_tm(secs, &alrm->time);
> +       rtc_time64_to_tm(secs, &alrm->time);
>
>         return rtc_valid_tm(&alrm->time);
>  }
> @@ -205,9 +205,7 @@ static int jz4740_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
>  {
>         int ret;
>         struct jz4740_rtc *rtc = dev_get_drvdata(dev);
> -       unsigned long secs;
> -
> -       rtc_tm_to_time(&alrm->time, &secs);
> +       unsigned long secs = rtc_tm_to_time64(&alrm->time);

nitpick: all other declarations are done with uint32_t, so to make it
clear (maybe) with something like:

uint32_t secs = lower_32_bits(rtc_tm_to_time64(&alrm->time));

Technically I would have stored the full time64_t here and put a
WARN_ON(secs > U32_MAX) but I am not sure what other driver are
supposed to do in this case.

>
>         ret = jz4740_rtc_reg_write(rtc, JZ_REG_RTC_SEC_ALARM, secs);
>         if (!ret)
> --
> 2.20.1
>