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

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Date:	Mon, 12 Oct 2015 21:56:49 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Sylwester Nawrocki <s.nawrocki@...sung.com>
Cc:	k.kozlowski.k@...il.com, Alim Akhtar <alim.akhtar@...sung.com>,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kgene@...nel.org,
	devicetree@...r.kernel.org, dianders@...omium.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] arm: dts: Fix audio card detection on peach boards

W dniu 12.10.2015 o 18:18, Sylwester Nawrocki pisze:
> 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. 

Oh yes, indeed it is. Thanks for pointing me in right direction.

Best regards,
Krzysztof

> 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.


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