linux-kernel - Re: [PATCH v5 1/2] dt-bindings: mmc: sdhci-of-dwcmshc: Add Eswin EIC7700

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Message-ID: <CAPDyKFqGwTF2w2JfqOuxMt6m_YJOYhqoUaQXyZALRu94W3fGkQ@mail.gmail.com>
Date: Fri, 24 Oct 2025 15:57:33 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: hehuan1@...incomputing.com, robh@...nel.org, krzk+dt@...nel.org
Cc: conor+dt@...nel.org, jszhang@...nel.org, adrian.hunter@...el.com, 
	p.zabel@...gutronix.de, linux-mmc@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, ningyu@...incomputing.com, 
	linmin@...incomputing.com, pinkesh.vaghela@...fochips.com, 
	xuxiang@...incomputing.com, luyulin@...incomputing.com, 
	dongxuyang@...incomputing.com, zhangsenchuan@...incomputing.com, 
	weishangjuan@...incomputing.com, lizhi2@...incomputing.com, 
	caohang@...incomputing.com, Conor Dooley <conor.dooley@...rochip.com>
Subject: Re: [PATCH v5 1/2] dt-bindings: mmc: sdhci-of-dwcmshc: Add Eswin EIC7700

On Sun, 19 Oct 2025 at 13:52, <hehuan1@...incomputing.com> wrote:
>
> From: Huan He <hehuan1@...incomputing.com>
>
> EIC7700 use Synopsys dwcmshc IP for SD/eMMC controllers.
> Add Eswin EIC7700 support in sdhci-of-dwcmshc.yaml.
>
> Signed-off-by: Huan He <hehuan1@...incomputing.com>
> Reviewed-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  .../bindings/mmc/snps,dwcmshc-sdhci.yaml      | 57 +++++++++++++++++--
>  1 file changed, 51 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> index f882219a0a26..7e7c55dc2440 100644
> --- a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> +++ b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> @@ -30,6 +30,7 @@ properties:
>            - sophgo,sg2002-dwcmshc
>            - sophgo,sg2042-dwcmshc
>            - thead,th1520-dwcmshc
> +          - eswin,eic7700-dwcmshc
>
>    reg:
>      maxItems: 1
> @@ -52,17 +53,30 @@ properties:
>      maxItems: 5
>
>    reset-names:
> -    items:
> -      - const: core
> -      - const: bus
> -      - const: axi
> -      - const: block
> -      - const: timer
> +    maxItems: 5
>
>    rockchip,txclk-tapnum:
>      description: Specify the number of delay for tx sampling.
>      $ref: /schemas/types.yaml#/definitions/uint8
>
> +  eswin,hsp-sp-csr:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    items:
> +      - items:
> +          - description: Phandle to HSP(High-Speed Peripheral) device
> +          - description: Offset of the stability status register for internal
> +                         clock.
> +          - description: Offset of the stability register for host regulator
> +                         voltage.
> +    description:
> +      HSP CSR is to control and get status of different high-speed peripherals
> +      (such as Ethernet, USB, SATA, etc.) via register, which can tune
> +      board-level's parameters of PHY, etc.

I would like second confirmation from DT maintainers, to make sure
it's reasonable to model the HW like this.

In principle the phandle above gets translated into a regmap via a
call to syscon_node_to_regmap() in the driver, to allow some registers
to be written that are outside the controllers address space.

> +
> +  eswin,drive-impedance-ohms:
> +    description: Specifies the drive impedance in Ohm.
> +    enum: [33, 40, 50, 66, 100]
> +
>  required:
>    - compatible
>    - reg
> @@ -110,6 +124,37 @@ allOf:
>              - const: block
>              - const: timer
>
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: eswin,eic7700-dwcmshc
> +    then:
> +      properties:
> +        resets:
> +          minItems: 4
> +          maxItems: 4
> +        reset-names:
> +          items:
> +            - const: axi
> +            - const: phy
> +            - const: prstn
> +            - const: txrx
> +      required:
> +        - eswin,hsp-sp-csr
> +        - eswin,drive-impedance-ohms
> +    else:
> +      properties:
> +        resets:
> +          maxItems: 5
> +        reset-names:
> +          items:
> +            - const: core
> +            - const: bus
> +            - const: axi
> +            - const: block
> +            - const: timer
> +
>    - if:
>        properties:
>          compatible:
> --
> 2.25.1
>

Kind regards
Uffe