linux-kernel - Re: [PATCH v2] dt-bindings: display: renesas,du: Provide bindings for r8a779a0

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Date:   Tue, 7 Sep 2021 13:45:00 -0500
From:   Rob Herring <robh@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Kieran Bingham <kieran.bingham@...asonboard.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Kieran Bingham <kieran.bingham+renesas@...asonboard.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM DRIVERS FOR RENESAS" <dri-devel@...ts.freedesktop.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] dt-bindings: display: renesas,du: Provide bindings
 for r8a779a0

On Mon, Sep 06, 2021 at 10:13:07AM +0200, Geert Uytterhoeven wrote:
> Hi Kieran,
> 
> On Thu, Sep 2, 2021 at 1:39 AM Kieran Bingham
> <kieran.bingham@...asonboard.com> wrote:
> > From: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> >
> > Extend the Renesas DU display bindings to support the r8a779a0 V3U.
> >
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> > Signed-off-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> > ---
> > v2:
> >  - Collected Laurent's tag
> >  - Remove clock-names requirement
> >  - Specify only a single clock
> 
> Thanks for the update!
> 
> > --- a/Documentation/devicetree/bindings/display/renesas,du.yaml
> > +++ b/Documentation/devicetree/bindings/display/renesas,du.yaml
> > @@ -39,6 +39,7 @@ properties:
> >        - renesas,du-r8a77980 # for R-Car V3H compatible DU
> >        - renesas,du-r8a77990 # for R-Car E3 compatible DU
> >        - renesas,du-r8a77995 # for R-Car D3 compatible DU
> > +      - renesas,du-r8a779a0 # for R-Car V3U compatible DU
> >
> >    reg:
> >      maxItems: 1
> > @@ -773,6 +774,55 @@ allOf:
> >          - reset-names
> >          - renesas,vsps
> >
> > +  - if:
> > +      properties:
> > +        compatible:
> > +          contains:
> > +            enum:
> > +              - renesas,du-r8a779a0
> > +    then:
> > +      properties:
> > +        clocks:
> > +          items:
> > +            - description: Functional clock
> > +
> > +        clock-names:
> > +          maxItems: 1
> > +          items:
> > +            - const: du
> > +
> > +        interrupts:
> > +          maxItems: 2
> > +
> > +        resets:
> > +          maxItems: 1
> > +
> > +        reset-names:
> > +          items:
> > +            - const: du.0
> 
> This is now inconsistent with clock-names, which doesn't use a suffix.

But it is consistent with all the other cases of 'reset-names'. The 
problem is 'clock-names' is not consistent and should be 'du.0'.

Ideally, the if/them schemas should not be defining the names. That 
should be at the top level and the if/them schema just limits the number 
of entries. That's not always possible, but I think is for clocks and 
resets in this case.

> 
> > +
> > +        ports:
> > +          properties:
> > +            port@0:
> > +              description: DSI 0
> > +            port@1:
> > +              description: DSI 1
> > +            port@2: false
> > +            port@3: false
> > +
> > +          required:
> > +            - port@0
> > +            - port@1
> > +
> > +        renesas,vsps:
> > +          minItems: 2
> > +
> > +      required:
> > +        - interrupts
> > +        - resets
> > +        - reset-names
> 
> Same here, as clock-names is not required anymore.
> 
> > +        - renesas,vsps
> > +
> >  additionalProperties: false
> >
> >  examples:
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> -- 
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
>