Re: [PATCH 02/16] clk: sunxi-ng: Add common infrastructure

Maxime Ripard
2016-05-18T19:59:29Z

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On Tue, May 17, 2016 at 08:54:27AM +0200, Jean-Francois Moine wrote:
> On Mon, 16 May 2016 22:15:09 +0200
> Maxime Ripard <maxime.ripard@free-electrons.com> wrote:
>
> > > > Yes, I intended it to be a simple busy waiting loop since I don't
> > > > expect it to be very long. Do yu have any more data on how much time
> > > > it usually takes?
> > >
> > > I have a Soc in which the rate of the audio clock is stable after a
> > > good second.
> >
> > You mean before the clock is actually stable, or before the lock bit
> > is cleared?
> >
> > Which SoC is it? As far as I've seen, only the H3 allows to configure
> > the stable time, and while by default it will take 16us, you can
> > configure as high as 66ms (which is still way higher than the current
> > limit).
>
> Hi Maxime,
>
> Well, it is not a SoC, but an external chip, the SI5351 (in the Dove
> Cubox). There is no lock bit, but as it is used for audio, and as I did
> not set any delay at streaming start time, I can hear when the clock is
> stable.

Ok. So I guess we set it high enough to cover the maximum we know for
know (65ms), and we can always rise that up later if needed.

Thanks!
Maxime

--
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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