Updated paw to include RGB support.

app/boards/arm/paw/Kconfig.defconfig

@@ -25,4 +25,10 @@ config ZMK_BLE
 config ZMK_USB
 	default y
 
+config ZMK_RGB_UNDERGLOW
+  default y
+
+config WS2812_STRIP
+  default y
+
 endif # BOARD_PAW

app/boards/arm/paw/paw.dts

@@ -19,6 +19,7 @@
 		zephyr,sram = &sram0;
 		zephyr,flash = &flash0;
 		zmk,kscan = &kscan0;
+		zmk,underglow = &led_strip;
 	};
 
 	kscan0: kscan {
@@ -43,6 +44,29 @@
 	*/
 };
 
+&spi1 {
+  compatible = "nordic,nrf-spim";
+  status = "okay";
+  mosi-pin = <22>;
+  // Unused pins, needed for SPI definition, but not used by the ws2812 driver itself.
+  sck-pin = <6>;
+  miso-pin = <7>;
+
+  led_strip: ws2812@0 {
+    compatible = "worldsemi,ws2812-spi";
+    label = "WS2812";
+
+    /* SPI */
+    reg = <0>; /* ignored, but necessary for SPI bindings */
+    spi-max-frequency = <4000000>;
+
+    /* WS2812 */
+    chain-length = <4>; /* number of LEDs */
+    spi-one-frame = <0x70>;
+    spi-zero-frame = <0x40>;
+  };
+};
+
 &gpio0 {
 	status = "okay";
 };

app/boards/arm/paw/paw_defconfig

@@ -20,3 +20,4 @@ CONFIG_FLASH_PAGE_LAYOUT=y
 CONFIG_FLASH_MAP=y
 CONFIG_CLOCK_CONTROL_NRF=y
 CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
+