linux-kernel - Re: [PATCH v2 2/5] dt-bindings: display: ssd1307fb: Extend schema for SPI controllers

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Message-ID: <YlXCGfA7DUbPPiXw@robh.at.kernel.org>
Date:   Tue, 12 Apr 2022 13:16:57 -0500
From:   Rob Herring <robh@...nel.org>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Chen-Yu Tsai <wens@...nel.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Maxime Ripard <mripard@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] dt-bindings: display: ssd1307fb: Extend schema
 for SPI controllers

On Tue, Apr 12, 2022 at 10:12:32AM +0200, Javier Martinez Canillas wrote:
> On 4/12/22 10:07, Geert Uytterhoeven wrote:
> > Hi Javier,
> 
> [snip]
> 
> >>
> >> Do you have any hints here on how I should enforce this in the schema ?
> >>
> >> Or if you think that a comment is enough, then I will add it in v3.
> > 
> > I don't know how to make it required for SPI, if possible at all.
> >
> 
> I see. Let's go with a comment then and we can later enforce it, if someone
> knows if is possible / how to do it.

It's not possible unless we annotate child nodes with something from the 
parent. '$nodename' is the one and only example of that. 

Really, this falls below the bar of what I'm concerned about checking. 
Ask me again when the conversions are all done (only ~2K to go :( ).

Rob