linux-kernel - Re: [PATCH RFC 01/10] dt-bindings: gpu: Add PowerVR Series5 SGX GPUs

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Date: Mon, 18 Dec 2023 10:28:09 +0100
From: H. Nikolaus Schaller <hns@...delico.com>
To: Maxime Ripard <mripard@...nel.org>
Cc: Andrew Davis <afd@...com>,
 Frank Binns <frank.binns@...tec.com>,
 Donald Robson <donald.robson@...tec.com>,
 Matt Coster <matt.coster@...tec.com>,
 Adam Ford <aford173@...il.com>,
 Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Thomas Zimmermann <tzimmermann@...e.de>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Chen-Yu Tsai <wens@...e.org>,
 Jernej Skrabec <jernej.skrabec@...il.com>,
 Samuel Holland <samuel@...lland.org>,
 Benoît Cousson <bcousson@...libre.com>,
 Tony Lindgren <tony@...mide.com>,
 Nishanth Menon <nm@...com>,
 Vignesh Raghavendra <vigneshr@...com>,
 Tero Kristo <kristo@...nel.org>,
 Paul Cercueil <paul@...pouillou.net>,
 dri-devel@...ts.freedesktop.org,
 devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org,
 linux-sunxi@...ts.linux.dev,
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Subject: Re: [PATCH RFC 01/10] dt-bindings: gpu: Add PowerVR Series5 SGX GPUs

Hi Maxime,

> Am 15.12.2023 um 14:33 schrieb Maxime Ripard <mripard@...nel.org>:
> 
>>> 
>>> It's for a separate architecture, with a separate driver, maintained out
>>> of tree by a separate community, with a separate set of requirements as
>>> evidenced by the other thread. And that's all fine in itself, but
>>> there's very little reason to put these two bindings in the same file.
>>> 
>>> We could also turn this around, why is it important that it's in the
>>> same file?
>> 
>> Same vendor. And enough similarity in architectures, even a logical sequence
>> of development of versions (SGX = Version 5, Rogue = Version 6+) behind.
>> (SGX and Rogue seem to be just trade names for their architecture development).
> 
> Again, none of that matters for *where* the binding is stored.

So what then speaks against extending the existing bindings file as proposed
here?

> 
>> AFAIK bindings should describe hardware and not communities or drivers
>> or who is currently maintaining it. The latter can change, the first not.
> 
> Bindings are supposed to describe hardware indeed. Nothing was ever said
> about where those bindings are supposed to be located.
> 
> There's hundreds of other YAML bindings describing devices of the same
> vendors and different devices from the same generation.

Usually SoC seem to be split over multiple files by subsystem. Not by versions
or generations. If the subsystems are similar enough they share the same bindings
doc instead of having one for each generation duplicating a lot of code.

Here is a comparable example that combines multiple vendors and generations:

Documentation/devicetree/bindings/usb/generic-ehci.yaml

> If anything it'll make it easier for you. I'm really not sure why it is
> controversial and you're fighting this so hard.

Well, you made it controversial by proposing to split what IMHO belongs together.

I feel that the original patch is good enough for its purpose and follows
some design pattern that can be deduced from other binding docs.

BR,
Nikolaus