[Keyboard] Add Serenity PCB (#18705)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/cannonkeys/serenity/config.h

@@ -0,0 +1,27 @@
+/*
+Copyright 2015 Jun Wako <wakojun@gmail.com>
+
+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/>.
+*/
+
+#pragma once
+
+#define BACKLIGHT_PWM_DRIVER    PWMD3
+#define BACKLIGHT_PWM_CHANNEL   1
+#define BACKLIGHT_PAL_MODE      1
+
+#define WS2812_SPI SPID2
+#define WS2812_SPI_MOSI_PAL_MODE 0
+#define WS2812_SPI_SCK_PAL_MODE 0
+#define WS2812_SPI_SCK_PIN B13