Re-structure splinky support to handle versioning in the same fashion as for the teensy (#19123)

keyboards/bastardkb/charybdis/4x6/v2/splinky_3/config.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2022 Charly Delay <charly@codesink.dev> (@0xcharly)
+ *
+ * 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
+
+/* Key matrix configuration. */
+#define MATRIX_ROW_PINS \
+    { GP29, GP26, GP5, GP4, GP9 }
+#define MATRIX_COL_PINS \
+    { GP27, GP28, GP21, GP6, GP7, GP8 }
+
+/* Handedness. */
+#define MASTER_RIGHT
+
+// To use the handedness pin, resistors need to be installed on the adapter PCB.
+// If so, uncomment the following code, and undefine MASTER_RIGHT above.
+// #define SPLIT_HAND_PIN GP15
+// #define SPLIT_HAND_PIN_LOW_IS_LEFT  // High -> right, Low -> left.
+
+/* serial.c configuration (for split keyboard). */
+#define SOFT_SERIAL_PIN GP1
+
+/* RGB settings. */
+#define RGB_DI_PIN GP0
+
+/* SPI & PMW3360 settings. */
+#define SPI_DRIVER SPID0
+#define SPI_SCK_PIN GP22
+#define SPI_MISO_PIN GP20
+#define SPI_MOSI_PIN GP23
+#define POINTING_DEVICE_CS_PIN GP16
+
+/* Reset. */
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_LED GP17
+#define RP2040_BOOTLOADER_DOUBLE_TAP_RESET_TIMEOUT 1000U