linux-kernel - Re: [PATCH v3 1/3] dt-bindings: mmc: renesas,sdhi: Document RZ/V2H(P) support

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Date: Tue, 25 Jun 2024 11:35:59 +0100
From: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To: Biju Das <biju.das.jz@...renesas.com>
Cc: Ulf Hansson <ulf.hansson@...aro.org>, Wolfram Sang <wsa+renesas@...g-engineering.com>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Magnus Damm <magnus.damm@...il.com>, 
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>, 
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v3 1/3] dt-bindings: mmc: renesas,sdhi: Document RZ/V2H(P) support

On Tue, Jun 25, 2024 at 10:47 AM Biju Das <biju.das.jz@...renesas.com> wrote:
>
<snip>
> > > > v1->v2
> > > > - Moved vqmmc object in the if block
> > > > - Updated commit message
> > > > ---
> > > >  .../devicetree/bindings/mmc/renesas,sdhi.yaml | 30
> > > > ++++++++++++++++++-
> > > >  1 file changed, 29 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > > > b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> > > > index 3d0e61e59856..20769434a422 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 +207,31 @@ 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:
> > > > +        renesas,sdhi-use-internal-regulator:
> > > > +          $ref: /schemas/types.yaml#/definitions/flag
> > > > +          description:
> > > > +            Flag to indicate internal regulator is being used instead of GPIO regulator.
> > > > +
> > > > +        vqmmc-regulator:
> > > > +          type: object
> > > > +          description: VQMMC SD regulator
> > > > +          $ref: /schemas/regulator/regulator.yaml#
> > > > +          unevaluatedProperties: false
> > > > +
> > > > +          properties:
> > > > +            regulator-compatible:
> > > > +              pattern: "^vqmmc-r9a09g057-regulator"
> > > > +
> > > > +      required:
> > > > +        - vqmmc-regulator
> > >
> > > Maybe we can drop required to make it optional, so that one has the
> > > option to select between { vqmmc-regulator, gpio regulator}??
> > >
> > I think making the regulator node optional isn't correct here as this internal regulator is always
> > present in the SoC and this has to be described in the DT no matter if it's being used or not.
>
> Agreed, but user can make it optional by setting pinmux as gpio and
> the internal regulator is valid only if we make it as a function.
>
> From, SoC point vqmmc-regulator is always available. So, it needs to be described
> as above. But required property and disabled in the node somewhat confusing??
>
'required' here is mainly to enforce validation for the checkers.
Maybe the DT maintainers can better explain here...

Cheers,
Prabhakar