diff --git a/keyboards/preonic/rev3/chconf.h b/keyboards/preonic/rev3/chconf.h
new file mode 100644
index 0000000000..47dd995f81
--- /dev/null
+++ b/keyboards/preonic/rev3/chconf.h
@@ -0,0 +1,29 @@
+/* Copyright 2021 QMK Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * This file was auto-generated by:
+ *    `qmk chibios-confmigrate -i keyboards/preonic/rev3/chconf.h -r platforms/chibios/QMK_PROTON_C/configs/chconf.h`
+ */
+
+#pragma once
+
+#define CH_CFG_ST_RESOLUTION 16
+
+#define CH_CFG_ST_FREQUENCY 10000
+
+#include_next <chconf.h>
+
diff --git a/keyboards/preonic/rev3/config.h b/keyboards/preonic/rev3/config.h
index d37f300b07..0e83124456 100644
--- a/keyboards/preonic/rev3/config.h
+++ b/keyboards/preonic/rev3/config.h
@@ -113,19 +113,19 @@
 /* override number of MIDI tone keycodes (each octave adds 12 keycodes and allocates 12 bytes) */
 //#define MIDI_TONE_KEYCODE_OCTAVES 1
 
-// #define WS2812_LED_N 2
-// #define RGBLED_NUM WS2812_LED_N
-// #define WS2812_TIM_N 2
-// #define WS2812_TIM_CH 2
-// #define PORT_WS2812     GPIOA
-// #define PIN_WS2812      1
-// #define WS2812_DMA_STREAM STM32_DMA1_STREAM2  // DMA stream for TIMx_UP (look up in reference manual under DMA Channel selection)
-//#define WS2812_DMA_CHANNEL 7                  // DMA channel for TIMx_UP
-//#define WS2812_EXTERNAL_PULLUP
+/*
+ * WS2812 Underglow Matrix options
+ */
 #define RGB_DI_PIN A1
 #define RGBLED_NUM 9
 #define RGBLIGHT_ANIMATIONS
 // RGB Matrix support
 #define DRIVER_LED_TOTAL RGBLED_NUM
 
+#define WS2812_PWM_DRIVER PWMD2
+#define WS2812_PWM_CHANNEL 2
+#define WS2812_PWM_PAL_MODE 1
+#define WS2812_DMA_STREAM STM32_DMA1_STREAM2
+#define WS2812_DMA_CHANNEL 2
+
 #endif
diff --git a/keyboards/preonic/rev3/mcuconf.h b/keyboards/preonic/rev3/mcuconf.h
new file mode 100644
index 0000000000..fbc4e7ca62
--- /dev/null
+++ b/keyboards/preonic/rev3/mcuconf.h
@@ -0,0 +1,30 @@
+/* Copyright 2021 QMK Contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include_next "mcuconf.h"
+
+// The SysTick timer from the normal quantum/stm32 uses TIM2 -- the WS2812 pin used
+// on the Planck requires the use of TIM2 to run PWM -- rework which timers are
+// allocated for PWM usage.
+#undef STM32_PWM_USE_TIM2
+#undef STM32_PWM_USE_TIM3
+#define STM32_PWM_USE_TIM2 TRUE
+#define STM32_PWM_USE_TIM3 FALSE
+
+// As mentioned above, we need to reallocate the SysTick timer used from
+// TIM2 to TIM3.
+#undef STM32_ST_USE_TIMER
+#define STM32_ST_USE_TIMER 3
diff --git a/keyboards/preonic/rev3/rules.mk b/keyboards/preonic/rev3/rules.mk
index ae7ff2a5ab..034ace02ad 100644
--- a/keyboards/preonic/rev3/rules.mk
+++ b/keyboards/preonic/rev3/rules.mk
@@ -21,7 +21,7 @@ AUDIO_ENABLE = yes           # Audio output
 UNICODE_ENABLE = no         # Unicode
 BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
 RGBLIGHT_ENABLE = yes        # Enable WS2812 RGB underlight.
-WS2812_DRIVER = bitbang
+WS2812_DRIVER = pwm
 API_SYSEX_ENABLE = no
 
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE