[PATCH v5 2/8] dt-bindings: firmware: thead,th1520: Add resets for GPU clkgen

[Bartosz Golaszewski]

On Wed, Jun 18, 2025 at 12:22 PM Michal Wilczynski
<m.wilczynski at samsung.com> wrote:
>
> Extend the TH1520 AON to describe the GPU clkgen reset line, required
> for proper GPU clock and reset sequencing.
>
> The T-HEAD TH1520 GPU requires coordinated management of two clocks
> (core and sys) and two resets (GPU core reset and GPU clkgen reset).
> Only the clkgen reset is exposed at the AON level, to support SoC
> specific initialization handled through a dedicated auxiliary power
> sequencing driver. The GPU core reset remains described in the GPU
> device node, as from the GPU driver's perspective, there is only a
> single reset line [1].
>
> This follows upstream maintainers' recommendations [2] to abstract SoC
> specific details into the PM domain layer rather than exposing them to
> drivers directly.
>
> Link: https://lore.kernel.org/all/816db99d-7088-4c1a-af03-b9a825ac09dc@imgtec.com/ - [1]
> Link: https://lore.kernel.org/all/38d9650fc11a674c8b689d6bab937acf@kernel.org/ - [2]
>
> Reviewed-by: Ulf Hansson <ulf.hansson at linaro.org>
> Signed-off-by: Michal Wilczynski <m.wilczynski at samsung.com>
> ---
>  Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml b/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml
> index bbc183200400de7aadbb21fea21911f6f4227b09..3365124c7fd4736922717bd31caa13272f4a4ea6 100644
> --- a/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml
> +++ b/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml
> @@ -32,6 +32,13 @@ properties:
>      items:
>        - const: aon
>
> +  resets:
> +    maxItems: 1
> +
> +  reset-names:
> +    items:
> +      - const: gpu-clkgen
> +
>    "#power-domain-cells":
>      const: 1
>
>
> --
> 2.34.1
>

Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski at linaro.org>