linux-kernel - Re: [PATCH v2 3/4] ASoC: dt-bindings: fsl-sai: allow only one dma-names

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Message-ID: <20240229-rundown-isotope-954ba9ea4c57@spud>
Date: Thu, 29 Feb 2024 18:57:29 +0000
From: Conor Dooley <conor@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Shengjiu Wang <shengjiu.wang@....com>, linux-sound@...r.kernel.org,
	devicetree@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/4] ASoC: dt-bindings: fsl-sai: allow only one
 dma-names

On Thu, Feb 29, 2024 at 06:55:58PM +0000, Conor Dooley wrote:
> On Tue, Feb 27, 2024 at 03:54:11PM -0500, Frank Li wrote:
> > Some sai only connect one direction. So allow only "rx" or "tx" for
> > dma-names.
> 
> Which sai? Can you restrict this per compatible please, so that someone
> cannot add 2 dmas for ones where only the tx is supported.
> 
> |  dmas:
> |    minItems: 1
> |    items:
> |      - description: DMA controller phandle and request line for RX
> |      - description: DMA controller phandle and request line for TX
> 
> The binding already allows only one, but it documents that the first dma
> is always the RX dma, and that doesn't change with this patch..

I said "doesn't change" - but I don't think you can change this
trivially, as something could rely on the first dma being the rx one.
You'd have to check that there is nothing using these using indices
rather than names before making any changes here.

> 
> Cheers,
> Conor.
> 
> > 
> > Signed-off-by: Frank Li <Frank.Li@....com>
> > ---
> >  Documentation/devicetree/bindings/sound/fsl,sai.yaml | 12 ++++++++----
> >  1 file changed, 8 insertions(+), 4 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/sound/fsl,sai.yaml b/Documentation/devicetree/bindings/sound/fsl,sai.yaml
> > index 2456d958adeef..0302752d58a2b 100644
> > --- a/Documentation/devicetree/bindings/sound/fsl,sai.yaml
> > +++ b/Documentation/devicetree/bindings/sound/fsl,sai.yaml
> > @@ -86,10 +86,14 @@ properties:
> >        - description: DMA controller phandle and request line for TX
> >  
> >    dma-names:
> > -    minItems: 1
> > -    items:
> > -      - const: rx
> > -      - const: tx
> > +    oneOf:
> > +      - items:
> > +          - const: rx
> > +          - const: tx
> > +      - items:
> > +          - enum:
> > +              - rx
> > +              - tx
> >  
> >    interrupts:
> >      items:
> > 
> > -- 
> > 2.34.1
> > 



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