Add animation devicetree bindings

app/dts/bindings/zmk,animation-pixel.yaml

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+# Copyright (c) 2020, The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+description: Pixel configuration
+
+compatible: "zmk,animation-pixel"
+
+pixel-cells:
+  - animation
+  - position_x
+  - position_y

app/dts/bindings/zmk,animation.yaml

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+# Copyright (c) 2020, The ZMK Contributors
+# SPDX-License-Identifier: MIT
+
+description: Global animation configuration
+
+compatible: "zmk,animation"
+
+properties:
+  drivers:
+    type: phandles
+    required: true
+    description: |
+      This array should contain all driver devices responsible for illuminating animated LEDs.
+      The devices must implement Zephyr's LED Strip Interface and expose a chain-lenght devicetree property.
+
+  animations:
+    type: phandles
+    required: true
+    description: |
+      Handles to all active animations.
+
+  pixels:
+    type: phandle-array
+    required: true
+    description: |
+      This field contains the pixel configuration for the entire board.
+      The order of this array determines in what order pixels are sent to the driver device API.
+      If multiple driving devices are used, their chain-length property determines the size of the buffer for each device.

app/include/dt-bindings/zmk/animation.h

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+/*
+ * Copyright (c) 2020 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+/**
+ * Maps HSL color settings into a single uint32_t value
+ * that can be cast to zmk_color_hsl.
+ */
+#ifdef CONFIG_BIG_ENDIAN
+#define HSL(h, s, l) ((h << 16) + (s << 8) + l)
+#else
+#define HSL(h, s, l) (h + (s << 16) + (l << 24))
+#endif