dt-bindings: input: colibri-vf50-ts: Improve documentation

Clarify properties definition, drop unused pinctrl-2 state 'gpio'.

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220712101619.326120-3-francesco.dolcini@toradex.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

diff --git a/Documentation/devicetree/bindings/input/touchscreen/colibri-vf50-ts.txt b/Documentation/devicetree/bindings/input/touchscreen/colibri-vf50-ts.txt
index 2e1490a8fe74ed8ca36f3b655d62f4e4ca3458d6..ca304357c374adbbe7079ddd6693d2416291f8a3 100644 (file)
--- a/Documentation/devicetree/bindings/input/touchscreen/colibri-vf50-ts.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/colibri-vf50-ts.txt
@@ -3,15 +3,16 @@
 Required Properties:
 - compatible must be toradex,vf50-touchscreen
 - io-channels: adc channels being used by the Colibri VF50 module
+    IIO ADC for Y-, X-, Y+, X+ connections
 - xp-gpios: FET gate driver for input of X+
 - xm-gpios: FET gate driver for input of X-
 - yp-gpios: FET gate driver for input of Y+
 - ym-gpios: FET gate driver for input of Y-
-- interrupts: pen irq interrupt for touch detection
-- pinctrl-names: "idle", "default", "gpios"
-- pinctrl-0: pinctrl node for pen/touch detection state pinmux
+- interrupts: pen irq interrupt for touch detection, signal from X plate
+- pinctrl-names: "idle", "default"
+- pinctrl-0: pinctrl node for pen/touch detection, pinctrl must provide
+    pull-up resistor on X+, X-.
 - pinctrl-1: pinctrl node for X/Y and pressure measurement (ADC) state pinmux
-- pinctrl-2: pinctrl node for gpios functioning as FET gate drivers
 - vf50-ts-min-pressure: pressure level at which to stop measuring X/Y values
 
 Example:
@@ -26,9 +27,8 @@ Example:
                ym-gpios = <&gpio0 4 GPIO_ACTIVE_HIGH>;
                interrupt-parent = <&gpio0>;
                interrupts = <8 IRQ_TYPE_LEVEL_LOW>;
-               pinctrl-names = "idle","default","gpios";
-               pinctrl-0 = <&pinctrl_touchctrl_idle>;
-               pinctrl-1 = <&pinctrl_touchctrl_default>;
-               pinctrl-2 = <&pinctrl_touchctrl_gpios>;
+               pinctrl-names = "idle","default";
+               pinctrl-0 = <&pinctrl_touchctrl_idle>, <&pinctrl_touchctrl_gpios>;
+               pinctrl-1 = <&pinctrl_touchctrl_default>, <&pinctrl_touchctrl_gpios>;
                vf50-ts-min-pressure = <200>;
        };