linux-kernel - Re: [PATCH 1/3] dt: bindings: mmc: Add phase control properties for the Aspeed SDHCI

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Date:   Tue, 15 Sep 2020 10:13:58 +0930
From:   "Andrew Jeffery" <andrew@...id.au>
To:     "Ulf Hansson" <ulf.hansson@...aro.org>
Cc:     linux-mmc <linux-mmc@...r.kernel.org>,
        "Adrian Hunter" <adrian.hunter@...el.com>,
        "Joel Stanley" <joel@....id.au>,
        "Rob Herring" <robh+dt@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        "Linux ARM" <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        "Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt: bindings: mmc: Add phase control properties for the Aspeed SDHCI



On Mon, 14 Sep 2020, at 19:11, Ulf Hansson wrote:
> On Thu, 10 Sep 2020 at 12:54, Andrew Jeffery <andrew@...id.au> wrote:
> >
> > Add properties to control the phase delay for input and output data
> > sampling.
> >
> > Signed-off-by: Andrew Jeffery <andrew@...id.au>
> > ---
> >  Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > index 987b287f3bff..75effd411554 100644
> > --- a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > @@ -61,6 +61,14 @@ patternProperties:
> >        sdhci,auto-cmd12:
> >          type: boolean
> >          description: Specifies that controller should use auto CMD12
> > +      "aspeed,input-phase":
> > +        $ref: '/schemas/types.yaml#/definitions/uint32'
> > +        description:
> > +          The input clock phase delay value.
> > +      "aspeed,output-phase":
> > +        $ref: '/schemas/types.yaml#/definitions/uint32'
> > +        description:
> > +          The output clock phase delay value.
> 
> We already have a common mmc clk-phase* binding, see
> mmc-controller.yaml. As matter of fact, there is one binding per speed
> mode.
> 
> Could that work for this case as well?

Ah, great, I think so. Sorry for overlooking that. I just need to extract from 
Aspeed what units the damn register fields are using :/

Andrew