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

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Message-ID: <20230106164812.GA14720@Dell2s-9>
Date:   Fri, 6 Jan 2023 08:48:12 -0800
From:   Piyush Malgujar <pmalgujar@...vell.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     <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>,
        <jannadurai@...vell.com>, <cchavva@...vell.com>
Subject: Re: [PATCH 3/5] dt-bindings: mmc: sdhci-cadence: SD6 support

Hi Krzysztof,

Thank you the review comments.

On Mon, Dec 19, 2022 at 04:40:35PM +0100, Krzysztof Kozlowski wrote:
> 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.
> 

Yes, that's correct. I will change it to 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?
> 

These tuning parameters are added here so to make them custom configurable for different
boards.

> > +
> >  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
> 

Rest of the comments will be taken care in V2.

Thanks,
Piyush