Depending on which display that is connected to the controller, an "1"
means either a black or a white pixel.

The supported formats (R1/R2/XRGB8888) expects the pixels
to map against (4bit):
00 => Black
01 => Dark Gray
10 => Light Gray
11 => White

If this is not what the display map against, the controller has support
to invert these values.

Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
---
 Documentation/devicetree/bindings/display/sitronix,st7571.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/sitronix,st7571.yaml b/Documentation/devicetree/bindings/display/sitronix,st7571.yaml
index 4fea782fccd701f5095a08290c13722a12a58b52..b83721eb4b7f8d258b4e845f107b056696b8d4a8 100644
--- a/Documentation/devicetree/bindings/display/sitronix,st7571.yaml
+++ b/Documentation/devicetree/bindings/display/sitronix,st7571.yaml
@@ -28,6 +28,11 @@ properties:
     description:
       Display supports 4-level grayscale.
 
+  sitronix,inverted:
+    type: boolean
+    description:
+      Display pixels are inverted, i.e. 0 is white and 1 is black.
+
   reset-gpios: true
   width-mm: true
   height-mm: true

-- 
2.49.0

On Mon, 21 Jul 2025 12:43:32 +0200, Marcus Folkesson wrote:
> Depending on which display that is connected to the controller, an "1"
> means either a black or a white pixel.
> 
> The supported formats (R1/R2/XRGB8888) expects the pixels
> to map against (4bit):
> 00 => Black
> 01 => Dark Gray
> 10 => Light Gray
> 11 => White
> 
> If this is not what the display map against, the controller has support
> to invert these values.
> 
> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
> Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
> ---
>  Documentation/devicetree/bindings/display/sitronix,st7571.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
> 

Reviewed-by: Rob Herring (Arm) <robh@kernel.org>