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

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Date:   Thu, 22 Oct 2020 11:29:23 +0800
From:   Tzung-Bi Shih <tzungbi@...gle.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Cheng-yi Chiang <cychiang@...omium.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

Hi, sorry for jumping into your discussion but I am trying to
summarize them to make sure we are on the same page.  Pardon me to
manually copy-and-paste partial sentences to quote.

ACK:
- Don't expose DAI connections in compatible strings.
- Use "model" DT property to make the card more UCM2-friendly.
- Expose new DT properties to distinguish different DMIC models.

NACK:
- All the board variations using exactly the same compatible string.
=> This is less realistic.  Although the CODECS information can be
retrieved from DT, it is inevitable to have some custom code for each
CODEC.

Per Mark's words:
> a different CODEC is something that often justifies a separate compatible
I think we should use different compatible strings for new CODECS
combinations.  And we should try to reuse the machine driver if they
share the most code.  In the worst case, introduce a new machine
driver for the new CODECS combinations.

- Srinivas's suggestion to set driver_name.
e.g. card->driver_name = "SM8250";
=> This sounds like a new DT property should be parsed in
sound/soc/qcom/common.c.  For example: "qcom,family"?  But as we do
less care about UCM2 for now, I would prefer to just leave it as is.


I would expect the following variants in DTS (just for example):

sound {
  compatible = "qcom,sc7180-trogdor";
  model = "sc7180-rt5682-max98357a-1mic";
}

sound {
  compatible = "qcom,sc7180-trogdor";
  model = "sc7180-rt5682-max98357a-2mic";
  dmic-gpio = ...
}

sound {
  compatible = "qcom,sc7180-pompom";
  model = "sc7180-adau7002-max98357a";
}


Please correct me if there is any misunderstanding.