linux-kernel - Re: [PATCH 1/5] dt-bindings: mtd: gpmi-nand: Add 'fsl,imx8qxp-gpmi-nand' compatible string

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Date: Fri, 17 May 2024 21:50:55 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Frank Li <Frank.li@....com>
Cc: Richard Weinberger <richard@....at>, Vignesh Raghavendra
 <vigneshr@...com>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Han Xu
 <han.xu@....com>, Vinod Koul <vkoul@...nel.org>, Shawn Guo
 <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix
 Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>,
 Marek Vasut <marex@...x.de>, linux-mtd@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 dmaengine@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/5] dt-bindings: mtd: gpmi-nand: Add
 'fsl,imx8qxp-gpmi-nand' compatible string

Hi Frank,

Frank.li@....com wrote on Fri, 17 May 2024 15:15:42 -0400:

> On Fri, May 17, 2024 at 08:36:21PM +0200, Miquel Raynal wrote:
> > Hi Frank,
> > 
> > Frank.Li@....com wrote on Fri, 17 May 2024 14:09:48 -0400:
> >   
> > > Add 'fsl,imx8qxp-gpmi-nand' compatible string and clock-names restriction.
> > > 
> > > Signed-off-by: Frank Li <Frank.Li@....com>
> > > ---
> > >  .../devicetree/bindings/mtd/gpmi-nand.yaml         | 22 ++++++++++++++++++++++
> > >  1 file changed, 22 insertions(+)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/mtd/gpmi-nand.yaml b/Documentation/devicetree/bindings/mtd/gpmi-nand.yaml
> > > index 021c0da0b072f..f9eb1868ca1f4 100644
> > > --- a/Documentation/devicetree/bindings/mtd/gpmi-nand.yaml
> > > +++ b/Documentation/devicetree/bindings/mtd/gpmi-nand.yaml
> > > @@ -24,6 +24,7 @@ properties:
> > >            - fsl,imx6q-gpmi-nand
> > >            - fsl,imx6sx-gpmi-nand
> > >            - fsl,imx7d-gpmi-nand
> > > +          - fsl,imx8qxp-gpmi-nand
> > >        - items:
> > >            - enum:
> > >                - fsl,imx8mm-gpmi-nand
> > > @@ -151,6 +152,27 @@ allOf:
> > >              - const: gpmi_io
> > >              - const: gpmi_bch_apb
> > >  
> > > +  - if:
> > > +      properties:
> > > +        compatible:
> > > +          contains:
> > > +            enum:
> > > +              - fsl,imx8qxp-gpmi-nand
> > > +    then:
> > > +      properties:
> > > +        clocks:
> > > +          items:
> > > +            - description: SoC gpmi io clock
> > > +            - description: SoC gpmi apb clock  
> > 
> > I believe these two clocks are mandatory?  
> 
> minItems default is equal to items numbers, here is 4. So all 4 clock are
> mandatory.
> 
> Anything wrong here?

I'd say that the two "bch" clocks are only used if you decide to
configure the on-host hardware ECC engine and thus are not needed with
software corrections, but I'm fine keeping the fourth described in all
cases if that's simpler.

Also,here the diff just shows that "if we provide a clocks property
with this compatible, then we need to provide 4 members", I believe the
"required" property is already filled somewhere with the
clocks/clock-names properties?

Thanks,
Miquèl