linux-kernel - Re: [PATCH 1/3] dt-bindings: sdhci-of-at91: new compatible string and update properties

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Date:   Mon, 30 Sep 2019 09:56:13 -0500
From:   Rob Herring <robh@...nel.org>
To:     Ludovic Desroches <ludovic.desroches@...rochip.com>
Cc:     linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-mmc@...r.kernel.org, ulf.hansson@...aro.org,
        nicolas.ferre@...rochip.com, adrian.hunter@...el.com,
        linux-kernel@...r.kernel.org, mark.rutland@....com,
        claudiu.beznea@...rochip.com
Subject: Re: [PATCH 1/3] dt-bindings: sdhci-of-at91: new compatible string
 and update properties

On Thu, Sep 12, 2019 at 10:09:06PM +0200, Ludovic Desroches wrote:
> There is a new compatible string for the SAM9X60 sdhci device. It involves
> an update of the properties about the clocks stuff.
> 
> Signed-off-by: Ludovic Desroches <ludovic.desroches@...rochip.com>
> ---
>  .../devicetree/bindings/mmc/sdhci-atmel.txt   | 25 ++++++++++++++++---
>  1 file changed, 22 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt b/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt
> index 1b662d7171a0..364ceea330b6 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt
> @@ -5,12 +5,19 @@ Documentation/devicetree/bindings/mmc/mmc.txt and the properties used by the
>  sdhci-of-at91 driver.
>  
>  Required properties:
> -- compatible:		Must be "atmel,sama5d2-sdhci".
> +- compatible:		Must be "atmel,sama5d2-sdhci" or "microchip,sam9x60-sdhci".
>  - clocks:		Phandlers to the clocks.
> -- clock-names:		Must be "hclock", "multclk", "baseclk";
> +- clock-names:		Must be "hclock", "multclk", "baseclk" for
> +			"atmel,sama5d2-sdhci".
> +			Must be "hclock", "multclk" for "microchip,sam9x60-sdhci".
>  
> +Optional properties:
> +- assigned-clocks:	The same with "multclk".
> +- assigned-clock-rates	The rate of "multclk" in order to not rely on the
> +			gck configuration set by previous components.
>  
> -Example:
> +
> +Examples:
>  
>  sdmmc0: sdio-host@...00000 {
>  	compatible = "atmel,sama5d2-sdhci";
> @@ -18,4 +25,16 @@ sdmmc0: sdio-host@...00000 {
>  	interrupts = <31 IRQ_TYPE_LEVEL_HIGH 0>;
>  	clocks = <&sdmmc0_hclk>, <&sdmmc0_gclk>, <&main>;
>  	clock-names = "hclock", "multclk", "baseclk";
> +	assigned-clocks = <&sdmmc0_gclk>;
> +	assigned-clock-rates = <480000000>;
> +};
> +
> +sdmmc0: sdio-host@...00000 {

mmc@...

Though I don't see much value in a second example. Examples are not a 
complete enumeration of all possible dts entries.

> +	compatible = "microchip,sam9x60-sdhci";
> +	reg = <0x80000000 0x300>;
> +	interrupts = <12 IRQ_TYPE_LEVEL_HIGH 0>;
> +	clocks = <&pmc PMC_TYPE_PERIPHERAL 12>, <&pmc PMC_TYPE_GCK 12>;
> +	clock-names = "hclock", "multclk";
> +	assigned-clocks = <&pmc PMC_TYPE_GCK 12>;
> +	assigned-clock-rates = <100000000>;
>  };
> -- 
> 2.23.0
>