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

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Date:   Thu, 22 Oct 2020 11:12:51 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Tzung-Bi Shih <tzungbi@...gle.com>, Mark Brown <broonie@...nel.org>
Cc:     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



On 22/10/2020 04:29, Tzung-Bi Shih wrote:
> 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.
> 
No, you can just hardcode this driver_name in your machine driver rather 
than getting it from DT, this is how everyone does!.
So need of adding anything to common.c

The thing that I suggested to add to common.c is setting card->long_name 
from "model" property.

> 
> I would expect the following variants in DTS (just for example):
> 
> sound {
>    compatible = "qcom,sc7180-trogdor";
Make sure that vendor name is correct here, am not sure if trogdor is 
qcom board or Google own board!

>    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.

Looks good to me!
thanks for doing this!

--srini
>