Re: [PATCH v2 1/7] dt-bindings: display: simple-framebuffer: Support system memory framebuffers

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Hi

Am 07.10.22 um 14:49 schrieb Thierry Reding:
From: Thierry Reding <treding@xxxxxxxxxx>

In order to support framebuffers residing in system memory, allow the
memory-region property to override the framebuffer memory specification
in the "reg" property.

What happens if both properties are present and they disagree with each other?

I understand that the framebuffer is behind 'memory-region', but does 'reg' still contain device memory? Do we need to acquire ownership from within the driver?

Best regards
Thomas


Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
  .../devicetree/bindings/display/simple-framebuffer.yaml      | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/simple-framebuffer.yaml b/Documentation/devicetree/bindings/display/simple-framebuffer.yaml
index dd64f70b5014..3e9857eb002e 100644
--- a/Documentation/devicetree/bindings/display/simple-framebuffer.yaml
+++ b/Documentation/devicetree/bindings/display/simple-framebuffer.yaml
@@ -63,6 +63,11 @@ properties:
    reg:
      description: Location and size of the framebuffer memory
+ memory-region:
+    maxItems: 1
+    description: Phandle to a node describing the memory to be used for the
+      framebuffer. If present, overrides the "reg" property (if one exists).
+
    clocks:
      description: List of clocks used by the framebuffer.

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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