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Date:   Fri, 24 Mar 2023 08:13:10 -0700
From:   Piyush Malgujar <pmalgujar@marvell.com>
To:     Rob Herring <robh@kernel.org>
CC:     <linux-mmc@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <adrian.hunter@intel.com>, <ulf.hansson@linaro.org>,
        <krzysztof.kozlowski+dt@linaro.org>,
        <yamada.masahiro@socionext.com>, <devicetree@vger.kernel.org>,
        <jannadurai@marvell.com>, <cchavva@marvell.com>
Subject: Re: [PATCH v3 5/6] dt-bindings: mmc: sdhci-cadence: SD6 support
Message-ID: <20230324151310.GB462@Dell2s-9>
References: <20230227183151.27912-1-pmalgujar@marvell.com>
 <20230227183151.27912-6-pmalgujar@marvell.com>
 <20230228154648.GA3298015-robh@kernel.org>
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In-Reply-To: <20230228154648.GA3298015-robh@kernel.org>
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Hi Rob,

Thanks for the review comments.

On Tue, Feb 28, 2023 at 09:46:48AM -0600, Rob Herring wrote:
> On Mon, Feb 27, 2023 at 10:31:50AM -0800, Piyush Malgujar wrote:
> > From: Jayanthi Annadurai <jannadurai@marvell.com>
> > 
> > Add support for SD6 controller support.
> 
> On what h/w?
> 

This has been used and tested on Marvell CN10K series SOCs.

> > 
> > Signed-off-by: Jayanthi Annadurai <jannadurai@marvell.com>
> > Signed-off-by: Piyush Malgujar <pmalgujar@marvell.com>
> > ---
> >  .../devicetree/bindings/mmc/cdns,sdhci.yaml   | 24 +++++++++++++++++--
> >  1 file changed, 22 insertions(+), 2 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml b/Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml
> > index 8b1a0fdcb5e3e2e8b87d8d7678e37f3dad447fc1..0dba17c4f17f82c8ae68e46225ed72418e8361ff 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@socionext.com>
> > @@ -18,7 +18,9 @@ properties:
> >        - enum:
> >            - microchip,mpfs-sd4hc
> >            - socionext,uniphier-sd4hc
> > -      - const: cdns,sd4hc
> > +      - enum:
> > +          - cdns,sd4hc
> > +          - cdns,sd6hc
> 
> Other than FPGA implementations IP vendor compatible strings are pretty 
> much useless. Define a compatible for your h/w.
> 

ok, will use Marvell specific string here. 

> >  
> >    reg:
> >      maxItems: 1
> > @@ -111,6 +113,24 @@ properties:
> >      minimum: 0
> >      maximum: 0x7f
> >  
> > +  cdns,iocell-input-delay-ps:
> > +    description: Delay in ps across the input IO cells
> > +
> > +  cdns,iocell-output-delay-ps:
> > +    description: Delay in ps across the output IO cells
> > +
> > +  cdns,delay-element-ps:
> > +    description: Delay element in ps used for calculating phy timings
> > +
> > +  cdns,read-dqs-cmd-delay-ps:
> > +    description: Command delay used in HS200 tuning
> > +
> > +  cdns,tune-val-start-ps:
> > +    description: Staring value of data delay used in HS200 tuning
> > +
> > +  cdns,tune-val-step-ps:
> > +    description: Incremental value of data delay used in HS200 tuning
> 
> Wouldn't any controller implementation need these possibly? IIRC, we 
> have some common properties for this. If not, survey what we do have and 
> come up with something common. Or you can imply all this from the h/w 
> specific compatible you are going to add.
> 

These parameters are for sd6 cadence controller, will add sd6 in the property
string so to imply it's specific to sd6hc.

> Rob

Thanks,
Piyush