linux-kernel - Re: [PATCH v3 1/5] dt-bindings: mmc: sdhci-of-aspeed: Add an example for AST2600-A2 EVB

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Message-ID: <CAL_JsqLywL6J_uVVquhOMevb6Geed-A2o7fzHQPKvVQxe4gscA@mail.gmail.com>
Date:   Fri, 7 May 2021 12:21:45 -0500
From:   Rob Herring <robh@...nel.org>
To:     Steven Lee <steven_lee@...eedtech.com>
Cc:     Andrew Jeffery <andrew@...id.au>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Joel Stanley <joel@....id.au>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Ryan Chen <ryanchen.aspeed@...il.com>,
        "moderated list:ASPEED SD/MMC DRIVER" <linux-aspeed@...ts.ozlabs.org>,
        "moderated list:ASPEED SD/MMC DRIVER" <openbmc@...ts.ozlabs.org>,
        "open list:ASPEED SD/MMC DRIVER" <linux-mmc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "Hongweiz@....com" <Hongweiz@....com>,
        Ryan Chen <ryan_chen@...eedtech.com>,
        Chin-Ting Kuo <chin-ting_kuo@...eedtech.com>
Subject: Re: [PATCH v3 1/5] dt-bindings: mmc: sdhci-of-aspeed: Add an example
 for AST2600-A2 EVB

On Thu, May 6, 2021 at 10:14 PM Steven Lee <steven_lee@...eedtech.com> wrote:
>
> The 05/07/2021 09:13, Rob Herring wrote:
> > On Thu, May 06, 2021 at 06:03:08PM +0800, Steven Lee wrote:
> > > AST2600-A2 EVB has the reference design for enabling SD bus
> > > power and toggling SD bus signal voltage by GPIO pins.
> > >
> > > In the reference design, GPIOV0 of AST2600-A2 EVB is connected to
> > > power load switch that providing 3.3v to SD1 bus vdd. GPIOV1 is
> > > connected to a 1.8v and a 3.3v power load switch that providing
> > > signal voltage to
> > > SD1 bus.
> > >
> > > If GPIOV0 is active high, SD1 bus is enabled. Otherwise, SD1 bus is
> > > disabled.
> > > If GPIOV1 is active high, 3.3v power load switch is enabled, SD1
> > > signal voltage is 3.3v. Otherwise, 1.8v power load switch will be
> > > enabled, SD1 signal voltage becomes 1.8v.
> > >
> > > AST2600-A2 EVB also support toggling signal voltage for SD2 bus.
> > > The design is the same as SD1 bus. It uses GPIOV2 as power-gpio and
> > > GPIOV3 as power-switch-gpio.
> > >
> > > Signed-off-by: Steven Lee <steven_lee@...eedtech.com>
> > > ---
> > >  .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 101 +++++++++++++++++-
> > >  1 file changed, 97 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > index 987b287f3bff..de7e61b3d37a 100644
> > > --- a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > +++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
> > > @@ -45,10 +45,16 @@ patternProperties:
> > >
> > >      properties:
> > >        compatible:
> > > -        enum:
> > > -          - aspeed,ast2400-sdhci
> > > -          - aspeed,ast2500-sdhci
> > > -          - aspeed,ast2600-sdhci
> > > +        oneOf:
> > > +          - items:
> > > +              - enum:
> > > +                  - aspeed,ast2400-sdhci
> > > +                  - aspeed,ast2500-sdhci
> > > +                  - aspeed,ast2600-sdhci
> > > +          - items:
> > > +              - enum:
> > > +                  - aspeed,ast2600-sdhci
> > > +              - const: sdhci
> >
> > Why are you adding 'sdhci'. That's not useful as a compatible given how
> > many quirks different implementations have.
> >
> >
>
> It is for passing the dtbs_check of the second example.
> Without this definition, many device trees have the following
> error:
>
> ['aspeed,ast2600-sdhci', 'sdhci'] is too long
> Additional items are not allowed ('sdhci' was unexpected)

I would probably fix the dts files then. Does anything depend on 'sdhci'?

Rob