summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/input/gpio-decoder.txt
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--Documentation/devicetree/bindings/input/gpio-decoder.txt23
1 files changed, 23 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/gpio-decoder.txt b/Documentation/devicetree/bindings/input/gpio-decoder.txt
new file mode 100644
index 000000000..14a77fb96
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/gpio-decoder.txt
@@ -0,0 +1,23 @@
+* GPIO Decoder DT bindings
+
+Required Properties:
+- compatible: should be "gpio-decoder"
+- gpios: a spec of gpios (at least two) to be decoded to a number with
+ first entry representing the MSB.
+
+Optional Properties:
+- decoder-max-value: Maximum possible value that can be reported by
+ the gpios.
+- linux,axis: the input subsystem axis to map to (ABS_X/ABS_Y).
+ Defaults to 0 (ABS_X).
+
+Example:
+ gpio-decoder0 {
+ compatible = "gpio-decoder";
+ gpios = <&pca9536 3 GPIO_ACTIVE_HIGH>,
+ <&pca9536 2 GPIO_ACTIVE_HIGH>,
+ <&pca9536 1 GPIO_ACTIVE_HIGH>,
+ <&pca9536 0 GPIO_ACTIVE_HIGH>;
+ linux,axis = <0>; /* ABS_X */
+ decoder-max-value = <9>;
+ };