linux-kernel - Re: [PATCH 0/8] ARM: sun8i: a33: Mali improvements

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Date:   Thu, 23 Feb 2017 16:19:21 -0800
From:   Maxime Ripard <maxime.ripard@...e-electrons.com>
To:     Emil Velikov <emil.l.velikov@...il.com>
Cc:     Tobias Jakobi <tjakobi@...h.uni-bielefeld.de>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        devicetree <devicetree@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
        LAKML <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 0/8] ARM: sun8i: a33: Mali improvements

Hi,

On Fri, Feb 17, 2017 at 08:39:33PM +0000, Emil Velikov wrote:
> As I feared things have taken a turn for the bitter end :-]
> 
> It seems that this is a heated topic, so I'l kindly ask that we try
> the following:
> 
>  - For people such as myself/Tobias/others who feel that driver and DT
> bindings should go hand in hand, prove them wrong.
> But please, do so by pointing to the documentation (conclusion of a
> previous discussion). This way you don't have to repeat yourself and
> get [too] annoyed over silly suggestions.

http://lxr.free-electrons.com/source/Documentation/devicetree/usage-model.txt#L13

"The "Open Firmware Device Tree", or simply Device Tree (DT), is a
data structure and language for describing hardware. More
specifically, it is a description of hardware that is readable by an
operating system so that the operating system doesn't need to hard
code details of the machine"

http://lxr.free-electrons.com/source/Documentation/devicetree/usage-model.txt#L79

"What it does do is provide a language for decoupling the hardware
configuration from the board and device driver support in the Linux
kernel (or any other operating system for that matter)."

And like I said, we already had bindings for out of tree bindings,
like this one:
https://patchwork.kernel.org/patch/9275707/

Which triggered no discussion at the time (but the technical one,
hence a v2, that should always be done).

> - The series has code changes which [seemingly] cater for out of tree
> module(s).

That patch was dropped, only DT changes remains now, and do not depend
of that missing patch anyway.

> Clearly state in the commit message who is the user, why it's save to
> do so and get an Ack from more prominent [DRM] developers.

DRM is really not important here. We could implement a driver using
i2c as far as the DT is concerned.

FreeBSD for example uses a different, !DRM framework to support our
display stack, and still uses the DT.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

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