linux-kernel - Re: [PATCH v1 3/3] riscv: dts: starfive: add tdm node and sound card

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Message-ID: <0d108d6c-e892-418b-b9af-6c2dd133dd71@spud>
Date:   Thu, 30 Mar 2023 16:31:30 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Walker Chen <walker.chen@...rfivetech.com>
Cc:     Conor Dooley <conor.dooley@...rochip.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v1 3/3] riscv: dts: starfive: add tdm node and sound card

On Thu, Mar 30, 2023 at 11:16:08PM +0800, Walker Chen wrote:
> On 2023/3/30 15:58, Conor Dooley wrote:

> > Excuse me for not following here, but Walker, could you point me at
> > where in the schematic for the VisionFive 2 that this wm8960 actually
> > is?
> > I know ~nothing about audio, but good old Google tells me that this is a
> > dedicated codec chip and I was looking at [1] and could not easily find
> > it on the schematic.

> > 1 https://doc-en.rvspace.org/VisionFive2/PDF/SCH_RV002_V1.2A_20221216.pdf

> The TDM need work together with external codec WM8960 by plugging the raspberry pie
>  audio board into the 40-pin, which is found in sheet 21 of the schematic. Because the
>  40-pin of VisionFive2 is fully compatible with the pins of Raspberry pie audio board. 
> 
> For more information of the audio board, you can take a look at the following webpage:
> https://wiki.seeedstudio.com/ReSpeaker_2_Mics_Pi_HAT/
> 
> The schematic of audio board:
> https://files.seeedstudio.com/wiki/MIC_HATv1.0_for_raspberrypi/src/ReSpeaker%202-Mics%20Pi%20HAT_SCH.pdf

Ahh, I feared that this was the case. If it's not on the board, then it
shouldn't be in the dts (and certainly nothing should be in
jh7110.dtsi!).
I suppose this should be a dt-overlay, but I don't know anything about
the upstream infrastructure for those. Nor do I know what is permitted
in terms of overlays.

Thanks,
Conor.

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