linux-kernel - [PATCH v2 02/15] dt-bindings: display: sprd: add memory-region property

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Message-Id: <20250722-ums9230-drm-v2-2-054276ec213d@abscue.de>
Date: Tue, 22 Jul 2025 16:41:04 +0200
From: Otto Pflüger <otto.pflueger@...cue.de>
To: 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>, Orson Zhai <orsonzhai@...il.com>, 
 Baolin Wang <baolin.wang@...ux.alibaba.com>, 
 Chunyan Zhang <zhang.lyra@...il.com>, Kevin Tang <kevin.tang@...soc.com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, 
 Otto Pflüger <otto.pflueger@...cue.de>
Subject: [PATCH v2 02/15] dt-bindings: display: sprd: add memory-region
 property

Explain that the DPU node supports a memory-region property that can be
used to describe an initial framebuffer set up by the bootloader,
usually in order to create a passthrough mapping for this framebuffer
when the IOMMU is used.

Signed-off-by: Otto Pflüger <otto.pflueger@...cue.de>
---
 .../devicetree/bindings/display/sprd/sprd,sharkl3-dpu.yaml        | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/sprd/sprd,sharkl3-dpu.yaml b/Documentation/devicetree/bindings/display/sprd/sprd,sharkl3-dpu.yaml
index 7f34652080b22e7b7072a709fd390a72375110ef..fa9ad2600f150e1023606898322a1a7b4675bab3 100644
--- a/Documentation/devicetree/bindings/display/sprd/sprd,sharkl3-dpu.yaml
+++ b/Documentation/devicetree/bindings/display/sprd/sprd,sharkl3-dpu.yaml
@@ -48,6 +48,14 @@ properties:
   iommus:
     maxItems: 1
 
+  memory-region:
+    maxItems: 1
+    description:
+      A phandle to the framebuffer region configured by the bootloader. This
+      can be used together with an iommu-addresses property on the reserved
+      memory region to create an initial passthrough mapping for the boot
+      splash framebuffer.
+
   port:
     type: object
     description:

-- 
2.50.0