linux-kernel - Re: [PATCH RFC 1/2] dt-bindings: mmc: sdhci-pxa: add state

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Message-ID: <20250721143541.GA593898-robh@kernel.org>
Date: Mon, 21 Jul 2025 09:35:41 -0500
From: Rob Herring <robh@...nel.org>
To: Duje Mihanović <duje@...emihanovic.xyz>
Cc: Ulf Hansson <ulf.hansson@...aro.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Karel Balej <balejk@...fyz.cz>, David Wronek <david@...nlining.org>,
	linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, phone-devel@...r.kernel.org,
	~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH RFC 1/2] dt-bindings: mmc: sdhci-pxa: add state_uhs
 pinctrl

On Fri, Jul 18, 2025 at 11:12:38PM +0200, Duje Mihanović wrote:
> On the pxav3 controller, increasing the drive strength of the data pins
> might be required to maintain stability on fast bus clocks (above 100
> MHz). Add a state_uhs pinctrl to allow this.
> 
> The existing state_cmd_gpio pinctrl is changed to apply only on pxav1 as
> it's unneeded on the other controllers.
> 
> Signed-off-by: Duje Mihanović <duje@...emihanovic.xyz>
> ---
>  .../devicetree/bindings/mmc/sdhci-pxa.yaml         | 45 +++++++++++++++++-----
>  1 file changed, 35 insertions(+), 10 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-pxa.yaml b/Documentation/devicetree/bindings/mmc/sdhci-pxa.yaml
> index 4869ddef36fd89265a1bfe96bb9663b553ac5084..7a9e2a63ac4351aea10b2763ca250ce4889df1eb 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-pxa.yaml
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-pxa.yaml
> @@ -30,6 +30,39 @@ allOf:
>            maxItems: 1
>          reg-names:
>            maxItems: 1
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: mrvl,pxav1-mmc
> +    then:
> +      properties:
> +        pinctrl-names:
> +          description:
> +            Optional for supporting PXA168 SDIO IRQ errata to switch CMD pin between
> +            SDIO CMD and GPIO mode.
> +          items:
> +            - const: default
> +            - const: state_cmd_gpio

blank line

> +        pinctrl-1:
> +          description:
> +            Should switch CMD pin to GPIO mode as a high output.
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: mrvl,pxav3-mmc
> +    then:
> +      properties:
> +        pinctrl-names:
> +          description:
> +            Optional for increasing stability of the controller at fast bus clocks.
> +          items:
> +            - const: default
> +            - const: state_uhs

blank line

> +        pinctrl-1:
> +          description:
> +            Should switch the drive strength of the data pins to high.
>  
>  properties:
>    compatible:
> @@ -62,21 +95,13 @@ properties:
>        - const: io
>        - const: core
>  
> -  pinctrl-names:
> -    description:
> -      Optional for supporting PXA168 SDIO IRQ errata to switch CMD pin between
> -      SDIO CMD and GPIO mode.
> -    items:
> -      - const: default
> -      - const: state_cmd_gpio
> +  pinctrl-names: true
>  
>    pinctrl-0:
>      description:
>        Should contain default pinctrl.
>  
> -  pinctrl-1:
> -    description:
> -      Should switch CMD pin to GPIO mode as a high output.
> +  pinctrl-1: true
>  
>    mrvl,clk-delay-cycles:
>      description: Specify a number of cycles to delay for tuning.
> 
> -- 
> 2.50.1
>