linux-kernel - Re: [RFC PATCH 3/4] dt-bindings: mmc: renesas,sdhi: Document RZ/V2H(P) support

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Date: Thu, 13 Jun 2024 14:06:43 -0600
From: Rob Herring <robh@...nel.org>
To: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc: Geert Uytterhoeven <geert+renesas@...der.be>, Ulf Hansson <ulf.hansson@...aro.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Wolfram Sang <wsa+renesas@...g-engineering.com>, Liam Girdwood <lgirdwood@...il.com>, 
	Mark Brown <broonie@...nel.org>, Magnus Damm <magnus.damm@...il.com>, linux-mmc@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, Biju Das <biju.das.jz@...renesas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [RFC PATCH 3/4] dt-bindings: mmc: renesas,sdhi: Document
 RZ/V2H(P) support

On Thu, Jun 6, 2024 at 3:12 AM Lad, Prabhakar
<prabhakar.csengg@...il.com> wrote:
>
> Hi Rob,
>
> Thank you for the review.
>
> On Thu, Jun 6, 2024 at 1:26 AM Rob Herring <robh@...nel.org> wrote:
> >
> > On Wed, Jun 05, 2024 at 08:49:35AM +0100, Prabhakar wrote:
> > > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > >
> > > The SD/MMC block on the RZ/V2H(P) ("R9A09G057") SoC is similar to that
> > > of the R-Car Gen3, but it has some differences:
> > > - HS400 is not supported.
> > > - It supports the SD_IOVS bit to control the IO voltage level.
> > > - It supports fixed address mode.
> > >
> > > To accommodate these differences, a SoC-specific 'renesas,sdhi-r9a09g057'
> > > compatible string is added.
> > >
> > > A "vqmmc-r9a09g057-regulator" regulator object is added to handle the
> > > voltage level switch of the SD/MMC pins.
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > > ---
> > >  .../devicetree/bindings/mmc/renesas,sdhi.yaml | 20 ++++++++++++++++++-
> > >  1 file changed, 19 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > > index 3d0e61e59856..154f5767cf03 100644
> > > --- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > > +++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > > @@ -18,6 +18,7 @@ properties:
> > >            - renesas,sdhi-r7s9210 # SH-Mobile AG5
> > >            - renesas,sdhi-r8a73a4 # R-Mobile APE6
> > >            - renesas,sdhi-r8a7740 # R-Mobile A1
> > > +          - renesas,sdhi-r9a09g057 # RZ/V2H(P)
> > >            - renesas,sdhi-sh73a0  # R-Mobile APE6
> > >        - items:
> > >            - enum:
> > > @@ -118,7 +119,9 @@ allOf:
> > >        properties:
> > >          compatible:
> > >            contains:
> > > -            const: renesas,rzg2l-sdhi
> > > +            enum:
> > > +              - renesas,sdhi-r9a09g057
> > > +              - renesas,rzg2l-sdhi
> > >      then:
> > >        properties:
> > >          clocks:
> > > @@ -204,6 +207,21 @@ allOf:
> > >          sectioned off to be run by a separate second clock source to allow
> > >          the main core clock to be turned off to save power.
> > >
> > > +  - if:
> > > +      properties:
> > > +        compatible:
> > > +          contains:
> > > +            const: renesas,sdhi-r9a09g057
> > > +    then:
> > > +      properties:
> > > +        vqmmc-r9a09g057-regulator:
> >
> > The node is already conditional on the compatible, so why the chip name?
> > Then it doesn't work when the 2nd chip needs this.
> >
> Are you suggesting to use a generic name "vqmmc-regulator"?


Yes, but "regulator-vqmmc" or just "regulator".

>
> Currently depending on the compat value "vqmmc-r9a09g057-regulator" in
> the driver the corresponding OF data is populated. In future if a
> different chip needs a regulator which varies slightly to the
> r9a09g057 chip this will have to have a different OF data. Hence I
> added the chip name in the regulator.

Yes, compatible values distinguish different chips, not node names.

Rob