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

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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
This commit is contained in:
Miquel Raynal 2023-07-14 03:37:52 +02:00 committed by Neil Armstrong
parent 893cfba7c5
commit 9943981aa3
1 changed files with 4 additions and 0 deletions
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4
Documentation/devicetree/bindings/display/panel/sitronix,st7789v.yaml
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@ -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