linux-kernel - Re: [PATCH v9 3/5] dt-bindings: gpu: img,powervr-rogue: Add TH1520 GPU compatible

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Message-ID: <90baea21-6e0a-4274-bda0-43ccad796f2a@kernel.org>
Date: Thu, 31 Jul 2025 17:28:18 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Michal Wilczynski <m.wilczynski@...sung.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>, Bartosz Golaszewski <brgl@...ev.pl>,
 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>,
 Drew Fustini <fustini@...nel.org>
Cc: 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 v9 3/5] dt-bindings: gpu: img,powervr-rogue: Add TH1520
 GPU compatible

On 31/07/2025 15:50, Michal Wilczynski wrote:
> Update the img,powervr-rogue.yaml to include the T-HEAD TH1520 SoC's
> specific GPU compatible string.
> 
> The thead,th1520-gpu compatible, along with its full chain
> img,img-bxm-4-64, and img,img-rogue, is added to the
> list of recognized GPU types.
> 
> While the BXM-4-64 GPU IP is designed with two distinct power domains,
> the TH1520 SoC integrates it with only a single, unified power gate that
> is controllable by the kernel.
> 
> The binding enforces this with a specific if block for the
> thead,th1520-gpu compatible that requires a single power-domains entry
> and disallows power-domain-names.
> 
> The B-series GPU rule is also updated to include img,img-bxm-4-64
> and to explicitly exclude the TH1520.
> 
> Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
> ---
>  .../devicetree/bindings/gpu/img,powervr-rogue.yaml | 29 +++++++++++++++++++++-
>  1 file changed, 28 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
> index 24ce46ba0b7015fca799f045ee2ccdd258088068..e47e0f3d1b5078b3050e26f6c1ac175edec528ec 100644
> --- a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
> +++ b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
> @@ -21,6 +21,11 @@ properties:
>            # work with newer dts.
>            - const: img,img-axe
>            - const: img,img-rogue
> +      - items:
> +          - enum:
> +              - thead,th1520-gpu
> +          - const: img,img-bxm-4-64
> +          - const: img,img-rogue
>        - items:
>            - enum:
>                - ti,j721s2-gpu
> @@ -96,7 +101,29 @@ allOf:
>        properties:
>          compatible:
>            contains:
> -            const: img,img-bxs-4-64
> +            const: thead,th1520-gpu
> +    then:
> +      properties:
> +        power-domains:
> +          items:
> +            - description: The single, unified power domain for the GPU on the
> +                TH1520 SoC, integrating all internal IP power domains.
> +        power-domain-names: false
> +      required:
> +        - power-domains
> +
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - img,img-bxm-4-64


I don't understand this. There is no such variant like not thead and
img,img-bxm-4-64.

So same comment as last time: this is overcomplicated. Use simple
clauses covering all possible variants. Do not add clauses for
impossible combinations.

Best regards,
Krzysztof