Add Radxa Rock 3B board

src/adafruit_blinka/board/radxa/rock3b.py

@@ -0,0 +1,53 @@
+# SPDX-FileCopyrightText: 2025 fb0u
+#
+# SPDX-License-Identifier: MIT
+"""Pin definitions for the Radxa Rock 3B."""
+
+from adafruit_blinka.microcontroller.rockchip.rk3568 import pin
+
+# 3B IO pins
+
+D1_A0 = pin.GPIO1_A0
+D1_A1 = pin.GPIO1_A1
+D0_B5 = pin.GPIO0_B5
+D0_D1 = pin.GPIO0_D1
+D0_D0 = pin.GPIO0_D0
+D3_C4 = pin.GPIO3_C4
+D3_A3 = pin.GPIO3_A3
+D3_C5 = pin.GPIO3_C5
+D0_C0 = pin.GPIO0_C0
+D0_B6 = pin.GPIO0_B6
+D3_B2 = pin.GPIO3_B2
+D4_C3 = pin.GPIO4_C3
+D4_C5 = pin.GPIO4_C5
+D0_C1 = pin.GPIO0_C1
+D4_C2 = pin.GPIO4_C2
+D4_C6 = pin.GPIO4_C6
+D4_D1 = pin.GPIO4_D1
+D2_D7 = pin.GPIO2_D7
+D3_A0 = pin.GPIO3_A0
+D3_C2 = pin.GPIO3_C2
+D3_C3 = pin.GPIO3_C3
+D3_A4 = pin.GPIO3_A4
+D3_A2 = pin.GPIO3_A2
+D3_A6 = pin.GPIO3_A6
+D3_A5 = pin.GPIO3_A5
+
+# I2C (use I2C3)
+SDA = D1_A0
+SCL = D1_A1
+
+# SPI (use SPI3)
+CE0 = D4_C6
+SCLK = D4_C2
+SCK = D4_C2
+MOSI = D4_C3
+MISO = D4_C5
+
+# UART aliases (use UART2)
+UART_TX = D0_D1
+UART_RX = D0_D0
+TXD = D0_D1
+RXD = D0_D0
+TX = D0_D1
+RX = D0_D0

src/board.py

@@ -281,6 +281,9 @@
 elif board_id == ap_board.ROCK_PI_3A:
     from adafruit_blinka.board.radxa.rockpi3a import *
 
+elif board_id == ap_board.ROCK_3B:
+    from adafruit_blinka.board.radxa.rock3b import *
+
 elif board_id == ap_board.ROCK_PI_3C:
     from adafruit_blinka.board.radxa.rockpi3c import *