linux-kernel - Re: [PATCH 1/3] drm/vc4: Remove the need for the GPU-subsystem DT node.

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Message-ID: <87efjmq2ad.fsf@anholt.net>
Date:   Tue, 10 Apr 2018 12:39:22 -0700
From:   Eric Anholt <eric@...olt.net>
To:     Stefan Wahren <stefan.wahren@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        linux-rpi-kernel@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Jon Mason <jonmason@...adcom.com>,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] drm/vc4: Remove the need for the GPU-subsystem DT node.

Stefan Wahren <stefan.wahren@...e.com> writes:

> Hi Eric,
>
>> Eric Anholt <eric@...olt.net> hat am 10. April 2018 um 01:00 geschrieben:
>> 
>> 
>> The GPU subsystem node was a workaround to have a central device to
>> bind V3D and display to.  Following the lead of 246774d17fc0
>> ("drm/etnaviv: remove the need for a gpu-subsystem DT node"), remove
>> the subsystem node usage and just create a platform device for the DRM
>> device to attach to if any of the subsystem devices are present.
>
> i didn't test it. Does the code change keep the backward compatibility with older DT?

Yes.

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