linux-kernel - Re: [PATCH v3 1/4] ASoC: dt-bindings: lpc32xx: Add lpc32xx i2s DT binding

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Date: Mon, 17 Jun 2024 11:33:47 +0200
From: Piotr Wojtaszczyk <piotr.wojtaszczyk@...esys.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Vladimir Zapolskiy <vz@...ia.com>, Russell King <linux@...linux.org.uk>, Jaroslav Kysela <perex@...ex.cz>, 
	Takashi Iwai <tiwai@...e.com>, "J.M.B. Downing" <jonathan.downing@...tel.com>, 
	Arnd Bergmann <arnd@...db.de>, Chancel Liu <chancel.liu@....com>, 
	Michael Ellerman <mpe@...erman.id.au>, linux-sound@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org, 
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 1/4] ASoC: dt-bindings: lpc32xx: Add lpc32xx i2s DT binding

On Sat, Jun 15, 2024 at 12:01 PM Krzysztof Kozlowski <krzk@...nel.org> wrote:
> Do not attach (thread) your patchsets to some other threads (unrelated
> or older versions). This buries them deep in the mailbox and might
> interfere with applying entire sets.

I'm sorry about that, it won't happen again.

> > +  dma-vc-names:
>
> Missing vendor prefix... but I don't really get what's the point of this
> property.

Is "nxp,lpc3xxx-dma-vc-names" acceptable?

>
> > +    $ref: /schemas/types.yaml#/definitions/string-array
> > +    description: |
> > +      names of virtual pl08x dma channels for tx and rx
> > +      directions in this order.
> > +    minItems: 2
> > +    maxItems: 2
>
> What part of hardware or board configuration this represents?
>
> It wasn't here and nothing in changelog explained it.

That's information which DMA signal and mux setting an I2S interface uses.
It's a name (bus_id field) of platform data entry from phy3250.c in
[PATCH v3 3/4].
It's used by snd_soc_dai_init_dma_data() in [PATCH v3 4/4] to give the
dmaengine a
hint which dma config to use. The LPC32xx doesn't have yet a dmamux driver like
lpc18xx-dmamux.c therefore it still uses platform data entries for
pl08x dma channels
and 'SND_DMAENGINE_PCM_FLAG_NO_DT | SND_DMAENGINE_PCM_FLAG_COMPAT'
flags in the devm_snd_dmaengine_pcm_register().
Typically instead of this platform data you would use regular 'dma'
and 'dma-names' if it had
proper dmamux driver like lpc18xx-dmamux.c

>
> Drop.
>
>
> > +
> > +  "#sound-dai-cells":
> > +    const: 0
> > +

The "dai-common.yam" doesn't declare a default value for this so
isn't it required? It's declared in others yaml files like:
Documentation/devicetree/bindings/sound/qcom,q6apm.yaml

--
Piotr Wojtaszczyk
Timesys