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

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Message-ID: <20251024-aghast-poster-82ee7aa7fdca@spud>
Date: Fri, 24 Oct 2025 17:37:59 +0100
From: Conor Dooley <conor@...nel.org>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: hehuan1@...incomputing.com, robh@...nel.org, krzk+dt@...nel.org,
	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 Fri, Oct 24, 2025 at 03:57:33PM +0200, Ulf Hansson wrote:
> 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.

If by second confirmation, you mean by someone other than me, obviously
ignore this, but I think this is "fine". It discussed on a previous
revision that all is being done with it is setting a handful bits that
signify that the peripheral has been configured correctly.

That said, I don't have a clue what's going on with the warning about
the dwmac device. That's definitely one for Rob.

> 
> 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

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