linux-kernel - Re: [PATCH 2/6] arm64: dts: qcom: sc8280xp: disable sound nodes

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Date:   Mon, 2 Jan 2023 18:20:25 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Johan Hovold <johan@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] arm64: dts: qcom: sc8280xp: disable sound nodes



On 2.01.2023 18:17, Johan Hovold wrote:
> On Mon, Jan 02, 2023 at 04:15:42PM +0100, Johan Hovold wrote:
>> On Mon, Jan 02, 2023 at 01:29:38PM +0100, Krzysztof Kozlowski wrote:
>>> On 02/01/2023 11:50, Johan Hovold wrote:
>>>> The sound nodes in the SoC dtsi should be disabled by default.
>>>>
>>>> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
>>>> ---
>>>>  arch/arm64/boot/dts/qcom/sc8280xp.dtsi | 16 ++++++++++++++++
>>>>  1 file changed, 16 insertions(+)
>>>>
>>>> diff --git a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
>>>> index ed1e2bee86ee..c1ce2d7b3675 100644
>>>> --- a/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
>>>> +++ b/arch/arm64/boot/dts/qcom/sc8280xp.dtsi
>>>> @@ -1733,6 +1733,8 @@ rxmacro: rxmacro@...0000 {
>>>>  
>>>>  			pinctrl-names = "default";
>>>>  			pinctrl-0 = <&rx_swr_default>;
>>>> +
>>>> +			status = "disabled";
>>>
>>> There is no reason this should be disabled by default. No external (per
>>> board) configuration is needed and by default SoC components should be
>>> enabled if they do not need anything from the board.
>>
>> This node is one of the nodes for which driver support is not yet in
>> place so that's one reason for at least disabling it temporarily.
>>
>> Since all other pinconfig lives in the board dts, if we decide to move
>> also the sound pinconfig then then that may be a second.
> 
> Also note that these depend on q6prmcc which is in turn depends on
> remoteproc_adsp being enabled by the x13s dts.
> 
> So keeping them disabled by default seems justified.
This I agree with, having sound-related nodes enabled by default
results in a big chunk of "deferred probe pending" spam when you
boot with adsp disabled (for example when you don't have fw for
your board in your rootfs)..

Konrad
> 
> Johan