linux-kernel - Re: [PATCH v5 3/8] pmdomain: thead: Instantiate GPU power sequencer via auxiliary bus

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Message-ID: <CAMRc=Mf+o524rewPrtZGJhE11Gwp6v8A2V6zjGr3e1PmQq7aJw@mail.gmail.com>
Date: Thu, 19 Jun 2025 14:31:32 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Michal Wilczynski <m.wilczynski@...sung.com>, Drew Fustini <drew@...7.com>, Guo Ren <guoren@...nel.org>, 
	Fu Wei <wefu@...hat.com>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Frank Binns <frank.binns@...tec.com>, 
	Matt Coster <matt.coster@...tec.com>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, 
	Marek Szyprowski <m.szyprowski@...sung.com>, linux-riscv@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-pm@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v5 3/8] pmdomain: thead: Instantiate GPU power sequencer
 via auxiliary bus

On Thu, Jun 19, 2025 at 12:25 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Wed, 18 Jun 2025 at 12:22, Michal Wilczynski
> <m.wilczynski@...sung.com> wrote:
> >
> > In order to support the complex power sequencing required by the TH1520
> > GPU, the AON power domain driver must be responsible for initiating the
> > corresponding sequencer driver. This functionality is specific to
> > platforms where the GPU power sequencing hardware is controlled by the
> > AON block.
> >
> > Extend the AON power domain driver to check for the presence of the
> > "gpu-clkgen" reset in its own device tree node.
> >
> > If the property is found, create and register a new auxiliary device.
> > This device acts as a proxy that allows the dedicated `pwrseq-thead-gpu`
> > auxiliary driver to bind and take control of the sequencing logic.
> >
> > Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
>
> Reviewed-by: Ulf Hansson <ulf.hansson@...aro.org>
>
> It looks like there is another re-spin needed, but thinking of the
> merge-strategy I could potentially take patch1->patch3 via my pmdomain
> tree, as it seems reasonable to keep those changes together. Unless
> Bartosz sees any problem with that, of course.
>

I have another change planned for the pwrseq API for this cycle.
Nothing major but it still will require patch 1/8 to be in my tree so
if you don't mind, I'll take it hrough the pwrseq tree and provide you
an immutable tag to pull before you apply the rest?

Bart