linux-kernel - Re: [PATCH 2/2] dt-bindings: gpu: add Allwinner H6 Mali Midgard binding

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Date:   Mon, 3 Dec 2018 13:42:07 +0100
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Heiko Stuebner <heiko@...ech.de>
Cc:     dri-devel@...ts.freedesktop.org, Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Chen-Yu Tsai <wens@...e.org>, David Airlie <airlied@...ux.ie>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-sunxi@...glegroups.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: gpu: add Allwinner H6 Mali Midgard
 binding

On Mon, Dec 03, 2018 at 01:25:21PM +0100, Heiko Stuebner wrote:
> >  - reg : Physical base address of the device and length of the register area.
> >  
> > @@ -44,6 +45,18 @@ Optional properties:
> >    for details.
> >  
> >  
> > +Vendor-specific bindings
> > +------------------------
> > +
> > +The Mali GPU is integrated very differently from one SoC to
> > +another. In order to accomodate those differences, you have the option
> > +to specify one more vendor-specific compatible, among:
> > +
> > +  - allwinner,sun50i-h6-mali
> > +    Required properties:
> > +      * resets: phandle to the reset line for the GPU
> 
> While this paragraph is similar to how it is done in Utgard, I'm
> wondering why we cannot just describe the "resets" as regular
> optional property above that.

Because it's not really optional, it's mandatory on some platforms
(like this one) and has no significance on others.

Maxime

-- 
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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