[rtc-linux] Re: [PATCH v2 9/9] rtc: hym8563: make sure hym8563 can be normal work

[Alexandre Belloni <alexandre.belloni@free-electrons.com>]

Hi,

On 17/09/2015 at 14:07:47 +0200, Heiko St=C3=BCbner wrote :
> Am Donnerstag, 17. September 2015, 18:39:28 schrieb Xing Zheng:
> > The rtc hym8563 maybe failed to register if first startup or rtc
> > powerdown:
> > [    0.988540 ] rtc-hym8563 1-0051: no valid clock/calendar values avai=
lable
> > [    0.995642 ] rtc-hym8563 1-0051: rtc core: registered hym8563 as rtc=
0 [=20
> >   1.078985 ] rtc-hym8563 1-0051: no valid clock/calendar values availab=
le [
> >    1.085698 ] rtc-hym8563 1-0051: hctosys: unable to read the hardware
> > clock
> >=20
> > We can set initial time for rtc and register it:
> > [    0.995678 ] rtc-hym8563 1-0051: rtc core: registered hym8563 as rtc=
0
> > [    1.080313 ] rtc-hym8563 1-0051: setting system clock to 2000-01-01
> > 00:02:00 UTC (946684920)
>=20
> hmm, not setting a false date was actually intentional when I did the dri=
ver.
>=20
> In my mind it is better to shout and keep programs from using wrong value=
s=20
> than to set some arbitary date and let programs silently use this wrong v=
alue.
>=20

Indeed, I find it worse to set a wrong value instead of returning an
error. Userspace has to define its policy when reading the time fails.

--=20
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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