linux-kernel - [PATCH v6 1/2] dt-bindings: gpu: Add 'resets' property for GPU initialization

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Message-Id: <20250418-apr_18_reset_img-v6-1-85a06757b698@samsung.com>
Date: Fri, 18 Apr 2025 13:22:48 +0200
From: Michal Wilczynski <m.wilczynski@...sung.com>
To: Frank Binns <frank.binns@...tec.com>,  Matt Coster
	<matt.coster@...tec.com>, David Airlie <airlied@...il.com>,  Simona Vetter
	<simona@...ll.ch>,  Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Marek Szyprowski <m.szyprowski@...sung.com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,  Krzysztof Kozlowski
	<krzysztof.kozlowski@...aro.org>,  Michal Wilczynski
	<m.wilczynski@...sung.com>
Subject: [PATCH v6 1/2] dt-bindings: gpu: Add 'resets' property for GPU
 initialization

All IMG Rogue GPUs include a reset line that participates in the
power-up sequence. On some SoCs (e.g., T-Head TH1520 and Banana Pi
BPI-F3), this reset line is exposed and must be driven explicitly to
ensure proper initialization.

To support this, add a 'resets' property to the GPU device tree
bindings.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Signed-off-by: Michal Wilczynski <m.wilczynski@...sung.com>
---
 Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
index 256e252f8087fa0d6081f771a01601d34b66fe19..bb607d4b1e072dacd184bf2782cacddf550580e4 100644
--- a/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
+++ b/Documentation/devicetree/bindings/gpu/img,powervr-rogue.yaml
@@ -37,6 +37,9 @@ properties:
   power-domains:
     maxItems: 1
 
+  resets:
+    maxItems: 1
+
 required:
   - compatible
   - reg

-- 
2.34.1