[PATCH 1/5] dt-bindings: display: panel-dpi: Add bits-per-color property

[Chen-Yu Tsai]

From: Chen-Yu Tsai <wens at csie.org>

Some LCD panels do not support 24-bit true color, or 8bits per channel
RGB. Many low end ones only support up to 6 bits per channel natively.

Add a device tree property to describe the native bit depth of the
panel. This is separate from the bus width or format of the connection
to the display output.

Signed-off-by: Chen-Yu Tsai <wens at csie.org>
---
 .../devicetree/bindings/display/panel/panel-dpi.yaml          | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/panel-dpi.yaml b/Documentation/devicetree/bindings/display/panel/panel-dpi.yaml
index 0cd74c8dab42..8eb013fb1969 100644
--- a/Documentation/devicetree/bindings/display/panel/panel-dpi.yaml
+++ b/Documentation/devicetree/bindings/display/panel/panel-dpi.yaml
@@ -26,6 +26,9 @@ properties:
   height-mm: true
   label: true
   panel-timing: true
+  bits-per-color:
+    description:
+      Shall contain an integer describing the number of bits per color.
   port: true
   power-supply: true
   reset-gpios: true
@@ -42,6 +45,7 @@ examples:
     panel {
         compatible = "osddisplays,osd057T0559-34ts", "panel-dpi";
         label = "osddisplay";
+        bits-per-color = <8>;
         power-supply = <&vcc_supply>;
         backlight = <&backlight>;
 
-- 
2.27.0