[PATCH v2 1/7] dt-bindings: display: simple-framebuffer: Support system memory framebuffers
Thomas Zimmermann
tzimmermann at suse.de
Mon Oct 10 09:37:37 UTC 2022
Hi
Am 07.10.22 um 14:49 schrieb Thierry Reding:
> From: Thierry Reding <treding at nvidia.com>
>
> 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 at nvidia.com>
> ---
> .../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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