[PATCH v3 15/19] dt-bindings: display: st7789v: bound the number of Rx data lines

[Sebastian Reichel <sre@kernel.org>]

From: Miquel Raynal <miquel.raynal@bootlin.com>

The ST7789V LCD controller supports regular SPI wiring, as well as no Rx
data line at all. The operating system needs to know whether it can read
registers from the device or not. Let's detail this specific design
possibility by bounding the spi-rx-bus-width property.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Sebastian Reichel <sre@kernel.org>
Tested-by: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Sebastian Reichel <sre@kernel.org>
---
 .../devicetree/bindings/display/panel/sitronix,st7789v.yaml   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml b/Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml
index 9f4157b02b84..905c064cd106 100644
--- a/Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml
+++ b/Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml
@@ -29,6 +29,10 @@ properties:
   spi-cpha: true
   spi-cpol: true
 
+  spi-rx-bus-width:
+    minimum: 0
+    maximum: 1
+
   dc-gpios:
     maxItems: 1
     description: DCX pin, Display data/command selection pin in parallel interface
-- 
2.40.1