linux-kernel - Re: [PATCH v1 00/25] lib, rtc: Print rtc

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Date:   Tue, 18 Jul 2017 10:50:05 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <rasmus.villemoes@...vas.dk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
        linux-rtc@...r.kernel.org
Cc:     Mark Salyzyn <salyzyn@...roid.com>
Subject: Re: [PATCH v1 00/25] lib, rtc: Print rtc_time via %pt[dt][rv]

On Thu, 2017-06-08 at 16:47 +0300, Andy Shevchenko wrote:
> Recently I have noticed too many users of struct rtc_time that printing
> its content field by field.
> 
> In this series I introduce %pt[dt][rv] specifier to make life a bit
> easier.

Hey Andy.

I just saw a patch with a printk for rtc time from Mark Salyzyn.
https://lkml.org/lkml/2017/7/18/885

Any idea if you want to push this extension?

I like the concept and still think it could be extended a bit more.

from: https://lkml.org/lkml/2017/6/8/1134

My preference would be for %pt[type]<output style>
where <type> is mandatory and could be:

        r for struct rtc_time
        6 for time64_t
        k for ktime_t
        T for struct timespec64
        etc

and <output style> has an unspecified default of
YYYY-MM-DD:hh:mm:ss

Perhaps use the "date" formats without the leading
% uses for <output style> for additional styles.