From: Michal Wilczynski Date: Mon, 23 Jun 2025 11:42:40 +0000 (+0200) Subject: dt-bindings: firmware: thead,th1520: Add resets for GPU clkgen X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7226b28ac776909fe744e078624b00fbe830bfd5;p=thirdparty%2Flinux.git dt-bindings: firmware: thead,th1520: Add resets for GPU clkgen 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 Reviewed-by: Drew Fustini Reviewed-by: Bartosz Golaszewski Reviewed-by: Krzysztof Kozlowski Signed-off-by: Michal Wilczynski Link: https://lore.kernel.org/r/20250623-apr_14_for_sending-v6-2-6583ce0f6c25@samsung.com Signed-off-by: Ulf Hansson --- diff --git a/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml b/Documentation/devicetree/bindings/firmware/thead,th1520-aon.yaml index bbc183200400d..3365124c7fd47 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