linux-kernel - Re: [PATCH 02/16] dt-bindings: mtd: gpmi-nand: Fix matching of clocks on different SoCs

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Message-ID: <20200825064908.GA3458@kozik-lap>
Date:   Tue, 25 Aug 2020 08:49:08 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Sascha Hauer <s.hauer@...gutronix.de>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Shawn Guo <shawnguo@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Adam Ford <aford173@...il.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Anson Huang <Anson.Huang@....com>,
        Robin Gong <yibin.gong@....com>, Li Jun <jun.li@....com>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Han Xu <han.xu@....com>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 02/16] dt-bindings: mtd: gpmi-nand: Fix matching of
 clocks on different SoCs

On Tue, Aug 25, 2020 at 08:40:20AM +0200, Sascha Hauer wrote:
> On Mon, Aug 24, 2020 at 09:06:47PM +0200, Krzysztof Kozlowski wrote:
> > Driver requires different amount of clocks for different SoCs.  Describe
> > these requirements properly to fix dtbs_check warnings like:
> > 
> >     arch/arm64/boot/dts/freescale/imx8mm-beacon-kit.dt.yaml: nand-controller@...02000: clock-names:1: 'gpmi_apb' was expected
> > 
> > Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> > ---
> >  .../devicetree/bindings/mtd/gpmi-nand.yaml    | 76 +++++++++++++++----
> >  1 file changed, 61 insertions(+), 15 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/mtd/gpmi-nand.yaml b/Documentation/devicetree/bindings/mtd/gpmi-nand.yaml
> > index 28ff8c581837..9d764e654e1d 100644
> > --- a/Documentation/devicetree/bindings/mtd/gpmi-nand.yaml
> > +++ b/Documentation/devicetree/bindings/mtd/gpmi-nand.yaml
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - fsl,imx6q-gpmi-nand
> > +              - fsl,imx6sx-gpmi-nand
> > +    then:
> > +      properties:
> > +        clocks:
> > +          items:
> > +            - description: SoC gpmi io clock
> > +            - description: SoC gpmi apb clock
> > +            - description: SoC gpmi bch clock
> > +            - description: SoC gpmi bch apb clock
> > +            - description: SoC per1 bch clock
> > +        clock-names:
> > +          items:
> > +            - const: gpmi_io
> > +            - const: gpmi_apb
> > +            - const: gpmi_bch
> > +            - const: gpmi_bch_apb
> > +            - const: per1_bch
> 
> This enforces this specific order of the clocks given in the dts. The
> clock binding itself doesn't require any specific order, that's what we
> have the names array for.
> 
> Is this really what we want?

Indeed but have in mind that the specific order was there already. This
patch does not address that part, only number of clocks.

Fixing this for any order could be done with patterns. I can work on
that.

Best regards,
Krzysztof