arm64: dts: ti: k3-am654-idk: Add GPIO decoder node

Add DT nodes to enable rotary switch on AM654 IDK add-on card connected
to gpios of PCA9536 I2C IO expander.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm64/boot/dts/ti/k3-am654-idk.dtso b/arch/arm64/boot/dts/ti/k3-am654-idk.dtso
index a395da5..35c1f24 100644
--- a/arch/arm64/boot/dts/ti/k3-am654-idk.dtso
+++ b/arch/arm64/boot/dts/ti/k3-am654-idk.dtso
@@ -8,6 +8,26 @@
 /dts-v1/;
 /plugin/;
 
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+   fragment@101 {
+        target-path = "/";
+
+        __overlay__ {
+                gpio-decoder {
+                        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>;
+                };
+        };
+   };
+};
+
 &main_i2c0 {
         status = "okay";
         clock-frequency = <400000>;