linux-kernel - Re: [PATCH 03/13] arm64: dts: qcom: msm8916: Add common msm8916-modem-qdsp6.dtsi

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Date:   Tue, 26 Sep 2023 22:01:21 +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 03/13] arm64: dts: qcom: msm8916: Add common
 msm8916-modem-qdsp6.dtsi

On 26.09.2023 21:06, Stephan Gerhold wrote:
> On Tue, Sep 26, 2023 at 08:49:24PM +0200, Konrad Dybcio wrote:
>> On 26.09.2023 18:51, Stephan Gerhold wrote:
>>> Most MSM8916/MSM8939 devices use very similar setups for the modem,
>>> because most of the device-specific details are abstracted by the modem
>>> firmware. There are several definitions (status switches, DAI links
>>> etc) that will be exactly the same for every board.
>>>
>>> Introduce a common msm8916-modem-qdsp6.dtsi include that can be used to
>>> simplify enabling the modem for such devices. By default the
>>> digital/analog codec in the SoC/PMIC is used, but boards can define
>>> additional codecs using the templates for Secondary and Quaternary
>>> MI2S.
>>>
>>> Signed-off-by: Stephan Gerhold <stephan@...hold.net>
>>> ---
>> I'd rather see at least one usage so that you aren't introducing
>> effectively non-compiled code..
>>
> 
> There are 10 usages in the rest of the patch series.
> Is that enough? :D
> 
> IMHO it doesn't make sense to squash this with one of the device
> patches, especially considering several of them are primarily authored
> by others.
I see..

Well, I guess I don't have better counter-arguments, but please
consider this the next time around.

[...]

>>> +&lpass_codec {
>>> +	status = "okay";
>>> +};
>> Any reason for it to stay disabled?
>>
> 
> You mean in msm8916.dtsi?
Yes

> For the SoC dtsi we don't make assumptions
> what devices use or not. There could be devices that ignore the internal
> codec entirely. If there is nothing connected to the codec lpass_codec
> should not be enabled (e.g. the msm8916-ufi.dtsi devices).
See my reply to patch 5

[...]

>>> +	sound_dai_secondary: mi2s-secondary-dai-link {
>>> +		link-name = "Secondary MI2S";
>>> +		status = "disabled"; /* Needs extra codec configuration */
>> Hmm.. Potential good user of /omit-if-no-ref/?
>>
> 
> AFAICT /omit-if-no-ref/ is for phandle references only. Basically it
> would only work if you would somewhere reference the phandle:
> 
> 	list-of-sound-dais = <&sound_dai_primary &sound_dai_secondary>;
> 
> But this doesn't exist so /omit-if-no-ref/ cannot be used here.
Ahh right, this is the one we don't reference.. Too bad,
would be a nice fit :/

I only see one usage of it though (patch 7), perhaps it could
be kept local to that one?

Konrad