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

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Date: Wed, 6 Mar 2024 21:02:38 -0500
From: Frank Li <Frank.li@....com>
To: Rob Herring <robh@...nel.org>
Cc: Conor Dooley <conor@...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 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.
> > > >
> > > > I log this at cover-letter. b4 can't support write change log at every
> > > > patch yet.
> > >
> > > It never will (probably). That's because it doesn't need to. You can
> > > just do it with git. When you edit the commit message, then after the
> > > tags, Add '---' and put whatever you want after. That works as long as
> > > the commit is applied from a patch as 'git am' will drop it.
> >
> > The key problem is that I don't want to lost notes when respin patches. It
> > is easy to make mistake when I copy old serise change logs.
> 
> You don't. It is all saved in the commit. When you rebase for the next
> version, you just add to the changes history.
> 
> > Previously I use git notes + git-rebase, it work fine. Notes can be kept
> > when I do rebase and git commit --amend. But one thing is not good.
> > git send-email --to-cmd=./script/get_maintainer.sh *.patch. It can't
> > combine all patches's maitainer to a list. It looks like difference patch
> > will be difference --to list.
> >
> > b4 can help some case. But can't keep git-notes information when rebase.
> > It should be git bugs or feature missed.
> 
> git-notes always seemed clunky and to be extra work to me. Just having
> the changelog in the commit msg is a lot easier.
> 
> > > > 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.

Frank
> 
> Rob