linux-kernel - Re: [PATCH v3 1/8] dt-bindings: power: Add T-HEAD TH1520 GPU power sequencer

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Message-ID: <CAMRc=Me9cWfe2mL=Q6JQbAFjpd55MOBZuAWC793Us0criiQr4Q@mail.gmail.com>
Date: Mon, 2 Jun 2025 16:46:29 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Michal Wilczynski <m.wilczynski@...sung.com>
Cc: 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>, 
	Ulf Hansson <ulf.hansson@...aro.org>, 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 v3 1/8] dt-bindings: power: Add T-HEAD TH1520 GPU power sequencer

On Fri, May 30, 2025 at 12:24 AM Michal Wilczynski
<m.wilczynski@...sung.com> wrote:
>
> Introduce device tree bindings for a new power sequencer provider
> dedicated to the T-HEAD TH1520 SoC's GPU.
>
> The thead,th1520-gpu-pwrseq compatible designates a node that will
> manage the complex power-up and power-down sequence for the GPU. This
> sequencer requires a handle to the GPU's clock generator reset line
> (gpu-clkgen), which is specified in its device tree node.
>
> This binding will be used by a new pwrseq driver to abstract the
> SoC specific power management details from the generic GPU driver.
>
> Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
> ---
>  .../bindings/power/thead,th1520-pwrseq.yaml        | 42 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 43 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/power/thead,th1520-pwrseq.yaml b/Documentation/devicetree/bindings/power/thead,th1520-pwrseq.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..4c302abfb76fb9e243946f4eefa333c6b02e59d3
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/power/thead,th1520-pwrseq.yaml
> @@ -0,0 +1,42 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/power/thead,th1520-pwrseq.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: T-HEAD TH1520 GPU Power Sequencer
> +
> +maintainers:
> +  - Michal Wilczynski <m.wilczynski@...sung.com>
> +
> +description: |
> +  This binding describes the power sequencer for the T-HEAD TH1520 GPU.
> +  This sequencer handles the specific power-up and power-down sequences
> +  required by the GPU, including managing clocks and resets from both the
> +  sequencer and the GPU device itself.
> +
> +properties:
> +  compatible:
> +    const: thead,th1520-gpu-pwrseq
> +

Before I review the rest: is this actually a physical device that
takes care of the power sequencing? Some kind of a power management
unit for the GPU? If so, I bet it's not called "power sequencer" so
let's use its actual name as per the datasheet?

Bart