dt-bindings: ads7846: Add hsync-gpios

The TI ADS7846 emits a horizontal sync signal that is usually
connected to a GPIO for polling. Add a binding for this.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240430-gpio-leds-miscarm-v1-2-9c94d7711f6c@linaro.org
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/devicetree/bindings/input/touchscreen/ads7846.txt b/Documentation/devicetree/bindings/input/touchscreen/ads7846.txt
index 81f6bda..399c877 100644 (file)
--- a/Documentation/devicetree/bindings/input/touchscreen/ads7846.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/ads7846.txt
@@ -57,6 +57,7 @@ Optional properties:
                                        pendown-gpio (u32).
        pendown-gpio                    GPIO handle describing the pin the !PENIRQ
                                        line is connected to.
+       ti,hsync-gpios                  GPIO line to poll for hsync
        wakeup-source                   use any event on touchscreen as wakeup event.
                                        (Legacy property support: "linux,wakeup")
        touchscreen-size-x              General touchscreen binding, see [1].