linux-kernel - Re: [PATCH 2/2] arm64: dts: qcom: sm8750-mtp: Add sound (speakers, headset codec, dmics)

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Message-ID: <07354130-999d-4f8d-9deb-49b72d8e4577@linaro.org>
Date: Wed, 30 Apr 2025 13:18:38 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Konrad Dybcio <konrad.dybcio@....qualcomm.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: qcom: sm8750-mtp: Add sound (speakers,
 headset codec, dmics)

On 30/04/2025 12:48, Konrad Dybcio wrote:
>>>>>> +		/*
>>>>>> +		 * WCD9395 RX Port 1 (HPH_L/R)      <=> SWR1 Port 1 (HPH_L/R)
>>>>>> +		 * WCD9395 RX Port 2 (CLSH)         <=> SWR1 Port 2 (CLSH)
>>>>>> +		 * WCD9395 RX Port 3 (COMP_L/R)     <=> SWR1 Port 3 (COMP_L/R)
>>>>>> +		 * WCD9395 RX Port 4 (LO)           <=> SWR1 Port 4 (LO)
>>>>>> +		 * WCD9395 RX Port 5 (DSD_L/R)      <=> SWR1 Port 5 (DSD_L/R)
>>>>>> +		 * WCD9395 RX Port 6 (HIFI_PCM_L/R) <=> SWR1 Port 9 (HIFI_PCM_L/R)
>>>>>> +		 */
>>>>>> +		qcom,rx-port-mapping = <1 2 3 4 5 9>;
>>>>>
>>>>> Does this deserve some dt-bindings constants?
>>>>
>>>> No, because these are hardware details/constants. Drivers do not use them.
>>>
>>> I'd argue it makes sense here - it makes more sense to pass meaningfully
>>> named constants to the driver, rather than blobs with a comment
>>
>> Sense of what? You want to make it a binding then answer what does it
>> bind, what part of ABI for driver is here a binding (answer none:
>> because driver does not use it)?
> 
> Sense of the magic numbers that otherwise require a comment.
> 
> dt-bindings don't exclusively contain enums-turned-defines that are

No, they don't.


Best regards,
Krzysztof