Re: [PATCH 00/13] arm64: Allwinner A64 support based on sunxi-ng

Jean-Francois Moine
2016-08-01T12:11:39Z

On Mon, 1 Aug 2016 20:01:49 +0800
Chen-Yu Tsai <wens@csie.org> wrote:

> On Mon, Aug 1, 2016 at 8:00 PM, Jean-Francois Moine <moinejf@free.fr> wro=
te:
> > On Mon, 1 Aug 2016 17:13:34 +0800
> > Chen-Yu Tsai <wens@csie.org> wrote:
> >
> >> > But I don't see why you are keeping the simple-gates. The bus gate m=
ay
> >> > be ungated/gated when the clock is enabled/disabled, and that's what
> >> > Allwinner's software does.
> >>
> >> For peripherals that have a separate mod clock, having them separate
> >> is a good thing. One example might be the audio codecs. You could unga=
te
> >> the bus gate to access its registers to program it, but only enable
> >> the mod clock when you actually play something.
> >
> > The roles of the bus gate and the clock gate are the same. I don't see
> > any reason to set one gate without setting the other one. More, the
> > spec says what the bus gate must be enabled before the clock gate (and
> > reverse order while disabling). So, setting both gates in one function
> > call seems safer.
>=20
> Wha? Aren't bus gates and clock gates the same thing in this context?

Yes. What is the problem?

--=20
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