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dt-bindings: display: st7789v: bound the number of Rx data lines

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>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230714013756.1546769-16-sre@kernel.org

authored by

Miquel Raynal and committed by
Neil Armstrong 9943981a 893cfba7

+4
+4
Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml
··· 29 29 spi-cpha: true 30 30 spi-cpol: true 31 31 32 + spi-rx-bus-width: 33 + minimum: 0 34 + maximum: 1 35 + 32 36 dc-gpios: 33 37 maxItems: 1 34 38 description: DCX pin, Display data/command selection pin in parallel interface