linux-kernel - Re: [PATCH v3 3/3] riscv: dts: starfive: add tdm node and sound card

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Message-ID: <ef13177a-2028-9fc9-628a-e3d287758207@starfivetech.com>
Date:   Thu, 11 May 2023 11:21:32 +0800
From:   Walker Chen <walker.chen@...rfivetech.com>
To:     Conor Dooley <conor@...nel.org>
CC:     Emil Renner Berthing <emil.renner.berthing@...onical.com>,
        Mark Brown <broonie@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor.dooley@...rochip.com>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-riscv@...ts.infradead.org>
Subject: Re: [PATCH v3 3/3] riscv: dts: starfive: add tdm node and sound card


On 2023/5/11 4:22, Conor Dooley wrote:
> On Wed, May 10, 2023 at 05:21:21PM +0800, Walker Chen wrote:
>> On 2023/5/10 16:33, Emil Renner Berthing wrote:
>> > On Tue, 9 May 2023 at 20:05, Conor Dooley <conor@...nel.org> wrote:
>> >>
>> >> On Tue, May 09, 2023 at 08:52:48PM +0800, Walker Chen wrote:
>> >> > Hi Conor/Emil,
>> >> >
>> >> > DT overlay is used to describe combinations of VF2 and hat.
>> >> > Do you have any comments on this patch ?
>> >>
>> >> I seem to recall that he said at the linux-riscv sync-up call that we
>> >> have* that he was not in favour of overlays for hats like this.
>> >> I'll let him confirm that though, I might very well be misinterpreting or
>> >> misremembering what he said.
>> > 
>> > What probably meant was that I didn't want a bunch of different device
>> > trees for each combination board * hat. An overlay makes a lot more
>> > sense. However, looking through the kernel tree there is a surprising
>> > lack of overlays for hats committed already, so I suspect there is
>> > some sort of policy around overlays already in place.
> 
>> About the specific usage of overlay for this board + hat, referenced to the following example in kernel:
>> linux/arch/arm64/boot/dts/freescale/imx8mm-venice-gw73xx-0x-imx219.dtso
>> That board is connected with imx219 sensor via mipi_csi interface. That patch was accepted in 2022.
> 
> Hmm, so spoke to Emil again today about it. In the interest of being
> fair, I did go looking at that particular board & looked through their
> documentation for more information on why there are overlays.
> They do actually sell the bits required to use the overlays, based on
> what I saw in their datasheet for the board & wiki. That said, what is
> done for one arm64 platform does not necessarily apply elsewhere ;)
> 
> I'm not against allowing in-tree overlays for hats/capes/daughter-boards
> that come bundled with a board, but accepting ones for a hat that
> someone decided to use theoretically has no limit! The "someone" in this
> case might be a StarFive developer, but it could be any random one of
> your customers next!
> We've got to draw a line somewhere, so my answer to the overlay *in this
> case* is a no. Sorry.
> When you submit your next version, please drop the overlay from this
> patch.

I'm trying to understand what you mean. so the conclusion is that I need to drop the file
 'jh7110-starfive-visionfive-2-wm8960.dtso' from this patch.
When I submit the next version, just keep the TDM node and the pins configuration for TDM in patch [3/3],
need to drop the wm8960 stuff.
Right ?

Best regards,
Walker