linux-kernel - Re: [PATCH 05/13] arm64: dts: qcom: msm8916-samsung-serranove: Add sound and modem

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Message-ID: <449f8299-3694-49e9-ba18-38cb52b5f196@linaro.org>
Date:   Tue, 26 Sep 2023 21:57:51 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Stephan Gerhold <stephan@...hold.net>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>, linux-arm-msm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH 05/13] arm64: dts: qcom: msm8916-samsung-serranove: Add
 sound and modem

[...]

>>>  
>>> +&sound {
>>> +	status = "okay";
>>> +	audio-routing =
>>> +		"AMIC1", "MIC BIAS External1",
>>> +		"AMIC2", "MIC BIAS Internal2",
>>> +		"AMIC3", "MIC BIAS External1";
>>> +};
>> I *think* we should be able to harmlessly enable &audio globally?
>>
> 
> What about boards that do not have/use audio at all? (see
> msm8916-ufi.dtsi). We don't even want to load the kernel modules on
> those.
Is it really an issue other than losing a few kb of memory?

> 
> IMO the SoC dtsi should always be minimal by default. This also
> guarantees that you don't run into trouble because of half- or
> incorrectly configured components during early bring-up, especially if
> you don't have serial and are hoping to get the device booting far
> enough to debug it.
Generally I'd agree, but if the audio machine driver cannot NOP
successfully without a topology configuration, that's a problem.

Konrad