linux-kernel - Re: [PATCH 1/3] dt-bindings: mmc: sdhci-of-dwcmhsc: Add Sophgo SG2042 support

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Date: Tue, 16 Apr 2024 17:44:48 +0100
From: Conor Dooley <conor@...nel.org>
To: Chen Wang <unicornxw@...il.com>
Cc: adrian.hunter@...el.com, aou@...s.berkeley.edu, conor+dt@...nel.org,
	guoren@...nel.org, inochiama@...look.com, jszhang@...nel.org,
	krzysztof.kozlowski+dt@...aro.org, palmer@...belt.com,
	paul.walmsley@...ive.com, robh@...nel.org, ulf.hansson@...aro.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-riscv@...ts.infradead.org,
	chao.wei@...hgo.com, haijiao.liu@...hgo.com,
	xiaoguang.xing@...hgo.com, tingzhu.wang@...hgo.com,
	Chen Wang <unicorn_wang@...look.com>
Subject: Re: [PATCH 1/3] dt-bindings: mmc: sdhci-of-dwcmhsc: Add Sophgo
 SG2042 support

On Tue, Apr 16, 2024 at 05:50:37PM +0800, Chen Wang wrote:
> From: Chen Wang <unicorn_wang@...look.com>
> 
> SG2042 use Synopsys dwcnshc IP for SD/eMMC controllers.
> 
> SG2042 defines 3 clocks for SD/eMMC controllers.
> - AXI_EMMC/AXI_SD for aclk/hclk(Bus interface clocks in DWC_mshc)
>   and blck(Core Base Clock in DWC_mshc), these 3 clocks share one
>   source, so reuse existing "core".
> - 100K_EMMC/100K_SD for cqetmclk(Timer clocks in DWC_mshc), so reuse
>   existing "timer" which was added for rockchip specified.
> - EMMC_100M/SD_100M for cclk(Card clocks in DWC_mshc), add new "card".
> 
> Adding some examples.
> 
> Signed-off-by: Chen Wang <unicorn_wang@...look.com>
> ---
>  .../bindings/mmc/snps,dwcmshc-sdhci.yaml      | 67 ++++++++++++++-----
>  1 file changed, 51 insertions(+), 16 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> index 4d3031d9965f..a04ccae216cf 100644
> --- a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> +++ b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> @@ -21,6 +21,7 @@ properties:
>        - snps,dwcmshc-sdhci
>        - sophgo,cv1800b-dwcmshc
>        - sophgo,sg2002-dwcmshc
> +      - sophgo,sg2042-dwcmshc
>        - thead,th1520-dwcmshc
>  
>    reg:
> @@ -30,23 +31,36 @@ properties:
>      maxItems: 1
>  
>    clocks:
> -    minItems: 1
> -    items:
> -      - description: core clock
> -      - description: bus clock for optional
> -      - description: axi clock for rockchip specified
> -      - description: block clock for rockchip specified
> -      - description: timer clock for rockchip specified
> -
> +    anyOf:
> +      - minItems: 1
> +        items:
> +          - description: core clock
> +          - description: bus clock for optional
> +          - description: axi clock for rockchip specified
> +          - description: block clock for rockchip specified
> +          - description: timer clock for rockchip specified
> +
> +      - minItems: 1

I don't think this minItems is needed, this is for one device which has
all 3, no?

I also think this combination should only be permitted for the sg2042,
since it is not valid for the existing devices.

Cheers,
Conor.

> +        items:
> +          - description: core clock
> +          - description: timer clock
> +          - description: card clock
>  
>    clock-names:
> -    minItems: 1
> -    items:
> -      - const: core
> -      - const: bus
> -      - const: axi
> -      - const: block
> -      - const: timer
> +    anyOf:
> +      - minItems: 1
> +        items:
> +          - const: core
> +          - const: bus
> +          - const: axi
> +          - const: block
> +          - const: timer
> +
> +      - minItems: 1
> +        items:
> +          - const: core
> +          - const: timer
> +          - const: card
>  
>    resets:
>      maxItems: 5
> @@ -96,5 +110,26 @@ examples:
>        #address-cells = <1>;
>        #size-cells = <0>;
>      };
> -
> +  - |
> +    mmc@...000 {
> +      compatible = "snps,dwcmshc-sdhci";
> +      reg = <0xbb000 0x1000>;
> +      interrupts = <0 25 0x4>;
> +      clocks = <&cru 17>;
> +      clock-names = "core";
> +      bus-width = <8>;
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +    };
> +  - |
> +    mmc@...000 {
> +      compatible = "snps,dwcmshc-sdhci";
> +      reg = <0xcc000 0x1000>;
> +      interrupts = <0 25 0x4>;
> +      clocks = <&cru 17>, <&cru 18>, <&cru 19>;
> +      clock-names = "core", "timer", "card";
> +      bus-width = <8>;
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +    };
>  ...
> -- 
> 2.25.1
> 

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