linux-kernel - Re: [PATCH v4 2/4] dt-bindings: mmc: sdhci-of-dwcmhsc: Add Sophgo SG2042 support

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Date: Tue, 18 Jun 2024 11:39:45 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Chen Wang <unicornxw@...il.com>, 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
Cc: Chen Wang <unicorn_wang@...look.com>
Subject: Re: [PATCH v4 2/4] dt-bindings: mmc: sdhci-of-dwcmhsc: Add Sophgo
 SG2042 support

On 18/06/2024 10:38, 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 example for sg2042.
> 
> Signed-off-by: Chen Wang <unicorn_wang@...look.com>
> ---
>  .../bindings/mmc/snps,dwcmshc-sdhci.yaml      | 69 +++++++++++++------
>  1 file changed, 49 insertions(+), 20 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml b/Documentation/devicetree/bindings/mmc/snps,dwcmshc-sdhci.yaml
> index 4d3031d9965f..b53f20733f79 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:
> @@ -29,25 +30,6 @@ properties:
>    interrupts:
>      maxItems: 1
>  
> -  clocks:

Widest constraints stay here.

> -    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
> -
> -
> -  clock-names:
> -    minItems: 1

Widest constraints stay here.

> -    items:
> -      - const: core
> -      - const: bus
> -      - const: axi
> -      - const: block
> -      - const: timer
> -
>    resets:
>      maxItems: 5
>  
> @@ -63,6 +45,43 @@ properties:
>      description: Specify the number of delay for tx sampling.
>      $ref: /schemas/types.yaml#/definitions/uint8
>  
> +if:

This should be under allOf block and move the allOf to expected place
like in example schema. So after required: block.

> +  properties:
> +    compatible:
> +      contains:
> +        const: sophgo,sg2042-dwcmshc
> +then:
> +  properties:
> +    clocks:
> +      items:
> +        - description: core clock
> +        - description: timer clock
> +        - description: card clock

What is the card clock? It's suspicious to see new clock not matching
anything from previous ones.

> +
> +    clock-names:
> +      items:
> +        - const: core
> +        - const: timer
> +        - const: card
> +else:
> +  properties:
> +    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
> +
> +    clock-names:
> +      minItems: 1
> +      items:
> +        - const: core
> +        - const: bus
> +        - const: axi
> +        - const: block
> +        - const: timer
>  
>  required:
>    - compatible
> @@ -96,5 +115,15 @@ examples:
>        #address-cells = <1>;
>        #size-cells = <0>;
>      };
> -
> +  - |
> +    mmc@...000 {
> +      compatible = "sophgo,sg2042-dwcmshc";
> +      reg = <0xcc000 0x1000>;
> +      interrupts = <0 25 0x4>;

Use defines... or actually drop entire example, no point to keep growing
them.

> +      clocks = <&cru 17>, <&cru 18>, <&cru 19>;
> +      clock-names = "core", "timer", "card";
> +      bus-width = <8>;
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +    };
>  ...

Best regards,
Krzysztof