linux-kernel - Re: [PATCH v11 2/3] ASoC: qcom: dt-bindings: Add sc7180 machine bindings

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Message-ID: <e876421c-dfeb-e853-1b65-53a786e9bcf9@linaro.org>
Date:   Wed, 21 Oct 2020 13:00:54 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Cheng-yi Chiang <cychiang@...omium.org>
Cc:     Mark Brown <broonie@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Taniya Das <tdas@...eaurora.org>,
        Rohit kumar <rohitkr@...eaurora.org>,
        Banajit Goswami <bgoswami@...eaurora.org>,
        Patrick Lai <plai@...eaurora.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Srinivasa Rao <srivasam@...eaurora.org>,
        Doug Anderson <dianders@...omium.org>,
        Dylan Reid <dgreid@...omium.org>,
        Tzung-Bi Shih <tzungbi@...omium.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Ajye Huang <ajye_huang@...pal.corp-partner.google.com>
Subject: Re: [PATCH v11 2/3] ASoC: qcom: dt-bindings: Add sc7180 machine
 bindings



On 20/10/2020 19:54, Cheng-yi Chiang wrote:
>> Not with the compatible string!
>>
>> Currently card name, and long name are exactly same in all Qualcomm
>> soundcards, which makes it very difficult to identify how those boards
>> re wired up at UCM2 level. So the plan is to properly populate card long
>> name with "model" property which can include details on how things are
>> wiredup on that board.
>>
>> --srini
> Hi Srini,
> Thanks for taking a look.
> Let me try to clarify your comments in case there is any misunderstanding.
> 
> I understand your request on having different board variations using
> different sound card names through model property, and I totally agree
> with that.
> As for compatible strings, do you insist on having all the board
> variations using exactly the same compatible string ?


For example if we set below property for sound card in Device tree
model = "RB5";

We will end up with

#   cat /proc/asound/cards
  0 [RB5            ]: RB5 - RB5
                       RB5

This is totally not very useful w.r.t UCM2 and makes it very difficult 
to common up parts of the configs.


My suggestions are.
1. set card->driver_name to something more sensible in your sound card 
driver.

ex:
	card->driver_name = "SM8250";

2. set long name in model DT property and set it as card long name
ex:
in DT:
	model = "Qualcomm-RB5-WSA8815-Speakers-DMIC0";

in sound driver or common.c:

of_property_read_string_index(np, "model", 0, &card->long_name);

With this set:

now
#   cat /proc/asound/cards
  0 [QualcommRB5WSA8]: SM8250 - Qualcomm-RB5-WSA8815-Speakers-D
                       Qualcomm-RB5-WSA8815-Speakers-DMIC0

This also means that in UCM2 we can have a top level SM8250 directory 
which can contain other board variants something like:

ucm2/Qualcomm/sm8250/Qualcomm-RB5-WSA8815-Speakers-DMIC0.conf
ucm2/Qualcomm/sm8250/Qualcomm-RB5-WSA8810-Speakers-DMIC123.conf
and so on!

Finally Only comment I had regarding compatible was not to encapsulate 
the connection details in it!. these can be made more sensible, 
something like
"qcom,sc7180-trogdor-v1", "qcom,sc7180-trogdor-v2".. and so on.

This compatible has nothing to do with driver or card short and long name.

Does that makes sense?


Thanks,
srini


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