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 08:57:24 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.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, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-renesas-soc@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH v3 1/3] dt-bindings: mmc: renesas,sdhi: Document RZ/V2H(P) support

Hi Prabhakar,

On Mon, Jun 24, 2024 at 5:33 PM Prabhakar <prabhakar.csengg@...il.com> 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-regulator' object is introduced to handle the power enable (PWEN)
> and voltage level switching for the SD/MMC.
>
> Additionally, the 'renesas,sdhi-use-internal-regulator' flag is introduced
> to indicate that an internal regulator is used instead of a
> GPIO-controlled regulator. This flag will help configure the internal
> regulator and avoid special handling when GPIO is used for voltage
> regulation instead of the SD_(IOVS/PWEN) pins.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> v2->v3
> - Renamed vqmmc-r9a09g057-regulator object to vqmmc-regulator
> - Added regulator-compatible property for vqmmc-regulator
> - Added 'renesas,sdhi-use-internal-regulator' property

Thanks for the update!

> --- a/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> +++ b/Documentation/devicetree/bindings/mmc/renesas,sdhi.yaml
> @@ -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.

Do you really need this?
The status of the regulator subnode already indicates this.

> +
> +        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

I'm not 100% sure this works correctly: does the checker complain if
a required subnode is disabled? Note that I haven't checked that.

> +
>  required:
>    - compatible
>    - reg

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds