[PATCH v1 1/4] dt-bindings: lcdif: Add interface pixel format

[Francesco Dolcini <francesco@dolcini.it>]

From: Francesco Dolcini <francesco.dolcini@toradex.com>

LCDIF has a hardware-configurable LCD_DATABUS_WIDTH field which selects
the parallel data bus transfer width. The selected mode changes how color
component bits are assigned to the LCD_DATA pins.

This must match the board wiring. On Colibri iMX6ULL, for example, only
18 LCD data lines are routed. A 24-bit panel can still be connected by
wiring the available LCD_DATA signals to the appropriate panel inputs.
Without describing the resulting interface format, LCDIF may assign the
color components to different data lines, causing shifted colors.

Add interface-pix-fmt so the binding can describe the configured LCDIF
bus format. The same property is already used by
display/imx/fsl,imx-parallel-display.yaml.

Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
---
 Documentation/devicetree/bindings/display/fsl,lcdif.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
index 2dd0411ec651..209ee5a96e39 100644
--- a/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
+++ b/Documentation/devicetree/bindings/display/fsl,lcdif.yaml
@@ -58,6 +58,13 @@ properties:
     items:
       - const: rx
 
+  interface-pix-fmt:
+    $ref: /schemas/types.yaml#/definitions/string
+    enum:
+      - rgb24
+      - rgb565
+      - rgb666
+
   interrupts:
     items:
       - description: LCDIF DMA interrupt
-- 
2.47.3