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 09:12:38 +0000
From: Biju Das <biju.das.jz@...renesas.com>
To: Prabhakar <prabhakar.csengg@...il.com>, 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>
CC: "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

Hi Prabhakar,

> -----Original Message-----
> From: Prabhakar <prabhakar.csengg@...il.com>
> Sent: Monday, June 24, 2024 4:32 PM
> Subject: [PATCH v3 1/3] dt-bindings: mmc: renesas,sdhi: Document RZ/V2H(P) support
> 
> 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
> 
> 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}??

Cheers,
Biju