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@abscue.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

On Tue, Jul 22, 2025 at 04:41:04PM +0200, Otto Pflüger wrote:
> 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@abscue.de>
> ---
>  .../devicetree/bindings/display/sprd/sprd,sharkl3-dpu.yaml        | 8 ++++++++
>  1 file changed, 8 insertions(+)

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

Best regards,
Krzysztof