feat(boards): add encoder support to planck

app/boards/arm/planck/planck_rev6.dts

@@ -44,6 +44,20 @@
             ;
     };
 
+    encoder: encoder {
+        compatible = "alps,ec11";
+        a-gpios = <&gpiob 12 GPIO_PULL_UP>;
+        b-gpios = <&gpiob 13 GPIO_PULL_UP>;
+        steps = <80>;
+        status = "disabled";
+    };
+
+    sensors: sensors {
+        compatible = "zmk,keymap-sensors";
+        sensors = <&encoder>;
+        triggers-per-rotation = <20>;
+    };
+
 layout_grid_transform:
     keymap_transform_0 {
         compatible = "zmk,matrix-transform";

app/boards/arm/planck/planck_rev6.keymap

@@ -7,6 +7,11 @@
 #include <behaviors.dtsi>
 #include <dt-bindings/zmk/keys.h>
 
+/* Uncomment this block if using an encoder */
+//&encoder {
+//    status = "okay";
+//};
+
 / {
     keymap {
         compatible = "zmk,keymap";
@@ -23,6 +28,7 @@
                 &kp LSHFT &kp Z    &kp X &kp C &kp V &kp B  &kp N   &kp M  &kp COMMA &kp DOT &kp SLASH &kp RET
                 &trans   &kp LCTL &kp LALT &kp LGUI &mo 1 &trans &kp SPACE &mo 2 &kp LEFT &kp DOWN &kp UP &kp RIGHT
             >;
+            sensor-bindings = <&inc_dec_kp C_VOL_UP C_VOL_DN>;
         };
 
         lower {

app/boards/arm/planck/planck_rev6.zmk.yml

@@ -5,6 +5,7 @@ type: board
 arch: arm
 features:
   - keys
+  - encoder
 outputs:
   - usb
 url: https://olkb.com/collections/planck

app/boards/arm/planck/planck_rev6_defconfig

@@ -14,3 +14,7 @@ CONFIG_GPIO=y
 CONFIG_CLOCK_CONTROL=y
 
 CONFIG_ZMK_USB=y
+
+# Uncomment these two lines to add support for encoder to your firmware
+#CONFIG_EC11=y
+#CONFIG_EC11_TRIGGER_OWN_THREAD=y