Re: [PATCH] arm: dts: Fix audio card detection on peach boards

[Alim Akhtar]

Hi Sylwester,

On 10/12/2015 02:48 PM, Sylwester Nawrocki wrote:
> On 12/10/15 08:47, Krzysztof Kozlowski wrote:
> > > diff --git a/arch/arm/boot/dts/exynos5420-peach-pit.dts b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> > > > index 8f4d76c..525a93a 100644
> > > > --- a/arch/arm/boot/dts/exynos5420-peach-pit.dts
> > > > +++ b/arch/arm/boot/dts/exynos5420-peach-pit.dts
> > > > @@ -1056,5 +1056,10 @@
> > > >   	timeout-sec = <32>;
> > > >   };
> > > >
> > > > +&pmu_system_controller {
> >
> > Please put the node in alphabetical order.
> >
> > > > +	assigned-clocks = <&pmu_system_controller 0>;
> > > > +	assigned-clock-parents =  <&clock CLK_FIN_PLL>;
> >
> > I might be missing something here but isn't the first clock of
> > pmu_system_controller already a CLK_FIN_PLL? So you are reparenting the
> > FIN_PLL to FIN_PLL?
>
> No, it's not, the first PMU consumer clock is indeed CLK_FIN_PLL,
> but pmu_system_controller is also a clock provider.  The first output
> clock of pmu_system_controller is CLKOUT, it's a composite mux and
> gate clock (registered in drivers/clk/samsung /clk-exynos-clkout.c).
> So  the above dts change is selecting an external oscillator input of
> the CLKOUT mux, i.e. it will route 24 MHz clock signal from the external
> oscillator to the CLKOUT output pin, to which audio CODEC is connected
> on peach-pit AFAICS.
Thanks for your explanation, indeed master clock of codec is
connected to XCLKOUT on peach boards.
Will send v2 addressing Kezysztof's other comments.

Regards,
Alim
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