linux-kernel - Re: [PATCH 3/5] dt-bindings: mmc: sdhci-cadence: SD6 support

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Message-ID: <5fc29d3c-e3da-3dc4-bce5-2158b81daa43@linaro.org>
Date:   Mon, 19 Dec 2022 16:40:35 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Piyush Malgujar <pmalgujar@...vell.com>, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, adrian.hunter@...el.com,
        ulf.hansson@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, yamada.masahiro@...ionext.com,
        devicetree@...r.kernel.org
Cc:     jannadurai@...vell.com, cchavva@...vell.com
Subject: Re: [PATCH 3/5] dt-bindings: mmc: sdhci-cadence: SD6 support

On 19/12/2022 15:24, Piyush Malgujar wrote:
> From: Jayanthi Annadurai <jannadurai@...vell.com>
> 

Subject: use final prefix matching the file, so "cdns,sdhci:"

> Add support for SD6 controller support

Full stop.

> 
> Signed-off-by: Jayanthi Annadurai <jannadurai@...vell.com>
> Signed-off-by: Piyush Malgujar <pmalgujar@...vell.com>
> ---
>  .../devicetree/bindings/mmc/cdns,sdhci.yaml   | 33 +++++++++++++++++--
>  1 file changed, 31 insertions(+), 2 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml b/Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml
> index 8b1a0fdcb5e3e2e8b87d8d7678e37f3dad447fc1..2043e78ccd5f708a01e87fd96ec410418fcd539f 100644
> --- a/Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml
> +++ b/Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml
> @@ -4,7 +4,7 @@
>  $id: http://devicetree.org/schemas/mmc/cdns,sdhci.yaml#
>  $schema: http://devicetree.org/meta-schemas/core.yaml#
>  
> -title: Cadence SD/SDIO/eMMC Host Controller (SD4HC)
> +title: Cadence SD/SDIO/eMMC Host Controller (SD4HC, SD6HC)
>  
>  maintainers:
>    - Masahiro Yamada <yamada.masahiro@...ionext.com>
> @@ -19,6 +19,7 @@ properties:
>            - microchip,mpfs-sd4hc
>            - socionext,uniphier-sd4hc
>        - const: cdns,sd4hc
> +      - const: cdns,sd6hc

Does not look like you tested the DTS against bindings. Please run `make
dtbs_check` (see Documentation/devicetree/bindings/writing-schema.rst
for instructions).

... because it does not really make sense. Why do you require SD6HC as
fallback? I think you meant enum.

>  
>    reg:
>      maxItems: 1
> @@ -111,6 +112,34 @@ properties:
>      minimum: 0
>      maximum: 0x7f
>  
> +  cdns,iocell_input_delay:

No underscores. Use proper units in name suffix:
https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml


> +    description: Delay in ps across the input IO cells
> +    $ref: "/schemas/types.yaml#/definitions/uint32"

Ditto... and so on - all of the fields.

> +
> +  cdns,iocell_output_delay:
> +    description: Delay in ps across the output IO cells
> +    $ref: "/schemas/types.yaml#/definitions/uint32"
> +
> +  cdns,delay_element:
> +    description: Delay element in ps used for calculating phy timings
> +    $ref: "/schemas/types.yaml#/definitions/uint32"
> +
> +  cdns,read_dqs_cmd_delay:
> +    description: Command delay used in HS200 tuning
> +    $ref: "/schemas/types.yaml#/definitions/uint32"
> +
> +  cdns,tune_val_start:
> +    description: Staring value of data delay used in HS200 tuning
> +    $ref: "/schemas/types.yaml#/definitions/uint32"
> +
> +  cdns,tune_val_step:
> +    description: Incremental value of data delay used in HS200 tuning
> +    $ref: "/schemas/types.yaml#/definitions/uint32"
> +
> +  cdns,max_tune_iter:
> +    description: Maximum number of iterations to complete the HS200 tuning process
> +    $ref: "/schemas/types.yaml#/definitions/uint32"

Why these three are properties of DT?

> +
>  required:
>    - compatible
>    - reg
> @@ -122,7 +151,7 @@ unevaluatedProperties: false
>  examples:
>    - |
>      emmc: mmc@...00000 {
> -        compatible = "socionext,uniphier-sd4hc", "cdns,sd4hc";
> +        compatible = "socionext,uniphier-sd4hc", "cdns,sd4hc", "cdns,sd6hc";

This is confusing. I don't understand it. It requires much more
explanation in your commit msg.

>          reg = <0x5a000000 0x400>;
>          interrupts = <0 78 4>;
>          clocks = <&clk 4>;

Best regards,
Krzysztof