Re: [PATCH v3 3/4] rtc: isl1208: add support for isl1219 with tamper detection

[Alexandre Belloni]

On 08/03/2018 at 11:53:09 +0000, Denis OSTERLAND wrote:
> Am Mittwoch, den 07.03.2018, 11:47 +0100 schrieb Alexandre Belloni:
> > > > > +
> > > > > +	tv64.tv_sec = rtc_tm_to_time64(&tm);
> > > > Why not using an unsigned long long directly here? time64_t is not the
> > > > correct type.
> > > Do you mean timespec64 is not the correct type here?
> > > Then yes, sould be time64_t.
> > > If you mean time64_t is not the correct type here,
> > > then can you give me some detail why there is no rtc_tm_to_u64,
> > > or something like that?
> > The rtc subsystem forbids negative times, the proper type should be
> > unsigned.
> I will add rtc_vaild_tm check.
> 
> Which sequence for time conversion would you expect?
> 
> time64_t secs = rtc_tm_to_time64(&tm);
> BUG_ON(secs < 0);
> return sprintf(buf, "%llu\n", (unsigned long long)secs);
> 
> or
> 
> return sprintf(buf, "%llu\n", (unsigned long long)rtc_tm_to_time64(&tm));

rtc_vaild_tm will already return EINVAL in case of negative time so this
is the one you should use.

-- 
Alexandre Belloni, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com