linux-kernel - Re: [PATCH v4 3/4] ASoC: dt-bindings: fsl-sai: allow only one dma-names

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Date: Thu, 7 Mar 2024 18:56:28 +0000
From: Conor Dooley <conor@...nel.org>
To: Frank Li <Frank.li@....com>
Cc: Rob Herring <robh@...nel.org>, Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...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 v4 3/4] ASoC: dt-bindings: fsl-sai: allow only one
 dma-names

On Wed, Mar 06, 2024 at 09:02:38PM -0500, Frank Li wrote:
> On Wed, Mar 06, 2024 at 04:58:22PM -0600, Rob Herring wrote:
> > On Wed, Mar 6, 2024 at 3:19 PM Frank Li <Frank.li@....com> wrote:
> > >
> > > On Wed, Mar 06, 2024 at 02:55:24PM -0600, Rob Herring wrote:
> > > > On Wed, Mar 06, 2024 at 02:25:53PM -0500, Frank Li wrote:
> > > > > On Wed, Mar 06, 2024 at 06:45:13PM +0000, Conor Dooley wrote:
> > > > > > On Tue, Mar 05, 2024 at 12:33:04PM -0500, Frank Li wrote:
> > > > > > > Some sai only connect one direction dma (rx/tx) in SOC. For example:
> > > > > > > imx8qxp sai5 only connect tx dma channel. So allow only one "rx" or "tx"
> > > > > > > for dma-names.
> > > > > > >
> > > > > > > Remove description under dmas because no user use index to get dma channel.
> > > > > > > All user use 'dma-names' to get correct dma channel. dma-names already in
> > > > > > > 'required' list.
> > > > > >
> > > > > > Acked-by: Conor Dooley <conor.dooley@...rochip.com>
> > > > > >
> > > > > > > Signed-off-by: Frank Li <Frank.Li@....com>
> > > > > > > ---
> > > > > > >  Documentation/devicetree/bindings/sound/fsl,sai.yaml | 13 ++++++-------
> > > > > > >  1 file changed, 6 insertions(+), 7 deletions(-)
> > > > > > >
> > > > > > > diff --git a/Documentation/devicetree/bindings/sound/fsl,sai.yaml b/Documentation/devicetree/bindings/sound/fsl,sai.yaml
> > > > > > > index 2456d958adeef..6f551c68d33db 100644
> > > > > > > --- a/Documentation/devicetree/bindings/sound/fsl,sai.yaml
> > > > > > > +++ b/Documentation/devicetree/bindings/sound/fsl,sai.yaml
> > > > > > > @@ -81,15 +81,14 @@ properties:
> > > > > > >
> > > > > > >    dmas:
> > > > > > >      minItems: 1
> > > > > > > -    items:
> > > > > > > -      - description: DMA controller phandle and request line for RX
> > > > > > > -      - description: DMA controller phandle and request line for TX
> > > > > > > +    maxItems: 2
> > > > > > >
> > > > > > >    dma-names:
> > > > > > > -    minItems: 1
> > > > > > > -    items:
> > > > > > > -      - const: rx
> > > > > > > -      - const: tx
> > > > > > > +    oneOf:
> > > > > > > +      - items:
> > > > > > > +          - const: rx
> > > > > > > +          - const: tx
> > > > > > > +      - enum: [ rx, tx ]
> > > > > >
> > > > > > I'm not entirely sure if this was Rob's suggestion, I got the impression
> > > > > > he was suggesting that in the two items case we'd not care about the
> > > > > > order. But while I think this is different to that suggestion it's also
> > > > > > not wrong.

> > > > > Rob's suggest was not work. dt-binding check complain too long
> > > > > if there are two dma-names = "rx", "tx".
> > > >
> > > > So I'm wrong or you didn't have it correct? No way to tell with your
> > > > explanation. Let me give you the exact schema:
> > > >
> > > > dma-names:
> > > >   minItems: 1
> > > >   items:
> > > >     - enum: [ rx, tx ]
> > > >     - const: tx
> > > >
> > > > This says we can have 1 or 2 entries. The first entry can be either rx
> > > > or tx. The 2nd entry must be tx. That's what you want. However, '"tx",
> > > > "tx"' is allowed with the above, but we enforce items to be unique
> > > > elsewhere. Or I thought we did, but we relaxed '.*-names$' at some
> > > > point. I'm going to fix that now.
> > >
> > > Conor find out my problem. The below code works. I missed maxItems.
> > >
> > >   dma-names:
> > >      minItems: 1
> > >      maxItems: 2
> > >      items
> > 
> > Missing ':'
> > 
> > >        enum: [ rx, tx ]
> > 
> > That is not my suggestion. This would be my 3rd choice after what I
> > proposed or what you had already. Please plug in exactly what I told
> > you and report back what doesn't work.
> 
> It also works. look likes conor's method is a little bit easy to be
> understood.

What I suggested is different, it is more permissive than what you have
or what Rob suggested. Your original one allows
"rx", "tx" OR "rx" OR "tx"
Rob's allows the same but with a nicer syntax. What that stm binding I
mentioned allows is
"rx", "tx" OR "tx", "rx" OR "rx" OR "tx"

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