rockchip: add support for Graperain G3568 v2

The Graperain G3568 v2 is an RK3568-based development board, just like the RK3568-EVB.
It always uses soldered connections between the GR3568CV2 core board and the
 RK3568BV2/GR3568BV2 I/O board.

The G3568 board has multiple hardware revisions, and we currently support v2 (I/O board).

Specification:
- SoC: RockChip RK3568 ARM64 (4 cores)
- eMMC: 16-128 GB
- RAM: 2-16 GB
- Power: DC 12V 2A
- Ethernet: 2x RTL8211F RGMII (10/100/1000 Mbps)
- Wireless radio: 802.11b/g/n/ac dual-band
- LED:
  Power: AlwaysOn
  User: GPIO
- Button:
  ESC: SARADC/0 <1100k µV>
  MENU: SARADC/0 <1400k µV>
  VOL-: SARADC/0 <430k µV>
  VOL+: SARADC/0 <50k µV>
  Power/Reset: PMIC RK809
- CAN
  CAN/1: 4-pin (PH 2.0)
- PWM
  PWM/4: Backlight
  PWM/5: Backlight
  PWM/7: IR Receiver
- UART:
  UART/2: Debug TTL - 1500000 8N1 (1.25mm)
  UART/3: TTL (PH 2.0)
  UART/4: TTL (PH 2.0)
  UART/8: AP6356S Bluetooth
  UART/9: TTL (PH 2.0)
- I2C:
  I2C/0: PMIC RK809
  I2C/1: Touchscreen
  I2C/4: Camera
  I2C/5: RTC@51 PCF8563
- I2S:
  I2S/0: HDMI Sound
  I2S/1: RK809 Audio Codec
  I2S/3: AP6356S Bluetooth Sound
- SDMMC:
  SDMMC/0: microSD (TF) slot
  SDMMC/2: AP6356S SDIO WiFi card
- Camera: 1x CSI
- Video: HDMI / DSI0 (MIPI/LVDS) / DSI1 (MIPI/EDP)
- Audio: HDMI / MIC / Speaker / SPDIF / 3.5mm Headphones / AP6356S Bluetooth
- USB:
  USB 2.0 HOST x2
  USB 2.0 OTG x1 (shared with USB 3.0 OTG/HOST)
  USB 3.0 HOST x1
  USB 3.0 OTG/HOST x1
- SATA: 1x SATA 3.0 with Power/4-pin
- PCIe: 1x PCIe 3.0 x2 (x4 connecter)

Link:
- https://image.chukouplus.com/upload/C_153/product_file/20211022/6daddec9e400458816dd4c57ba807fc3.pdf
- https://blog.gov.cooking/archives/research-graperain-g3568-v2-and-flash.html

Signed-off-by: Coia Prant <coiaprant@gmail.com>

Author: rbqvq

config/boards/graperain-g3568-v2.csc

@@ -0,0 +1,87 @@
+# Rockchip RK3568 quad core 2GB-16GB RAM SoC 2 x GBE eMMC USB3 WiFi/BT PCIe SATA NVMe
+BOARD_NAME="G3568 v2"
+BOARD_VENDOR="graperain"
+BOARDFAMILY="rockchip64"
+BOARD_MAINTAINER="rbqvq"
+INTRODUCED="2024"
+KERNEL_TARGET="current,edge"
+KERNEL_TEST_TARGET="current"
+FULL_DESKTOP="yes"
+BOOT_SOC="rk3568"
+BOOT_LOGO="desktop"
+BOOT_FDT_FILE="rockchip/rk3568-graperain-g3568-v2.dtb"
+IMAGE_PARTITION_TABLE="gpt"
+MODULES="ledtrig_netdev"
+
+# Mainline U-Boot
+function post_family_config__graperain_g3568_v2_use_mainline_uboot() {
+	display_alert "$BOARD" "Using mainline U-Boot for $BOARD / $BRANCH" "info"
+
+	declare -g BOOTCONFIG="graperain-g3568-v2-rk3568_defconfig"
+	declare -g BOOTSOURCE="https://github.com/u-boot/u-boot.git"
+	declare -g BOOTBRANCH="tag:v2026.04"
+	declare -g BOOTPATCHDIR="v2026.04/board_${BOARD}"
+
+	declare -g UBOOT_TARGET_MAP="BL31=${RKBIN_DIR}/${BL31_BLOB} ROCKCHIP_TPL=${RKBIN_DIR}/${DDR_BLOB};;u-boot-rockchip.bin"
+
+	unset uboot_custom_postprocess write_uboot_platform write_uboot_platform_mtd
+
+	function write_uboot_platform() {
+		dd if=$1/u-boot-rockchip.bin of=$2 seek=64 conv=notrunc status=none
+	}
+}
+
+function post_family_tweaks__graperain_g3568_v2_udev_network_interfaces() {
+	display_alert "$BOARD" "Renaming interfaces" "info"
+
+	mkdir -p $SDCARD/etc/udev/rules.d/
+	cat <<- EOF > "${SDCARD}/etc/udev/rules.d/70-persistent-net.rules"
+		SUBSYSTEM=="net", ACTION=="add", KERNELS=="fe010000.ethernet", NAME:="eth0"
+		SUBSYSTEM=="net", ACTION=="add", KERNELS=="fe2a0000.ethernet", NAME:="eth1"
+	EOF
+}
+
+function post_family_tweaks_bsp__graperain_g3568_v2_enable_leds() {
+	display_alert "$BOARD" "Creating Board Support LED Config" "info"
+	cat <<- EOF > "$destination"/etc/armbian-leds.conf
+		[/sys/class/leds/stmmac-0:01:amber:lan]
+		trigger=netdev
+		interval=52
+		link_10=0
+		link_100=0
+		link_1000=0
+		tx=1
+		rx=1
+		device_name=eth1
+
+		[/sys/class/leds/stmmac-0:01:green:lan]
+		trigger=netdev
+		interval=52
+		link_10=1
+		link_100=1
+		link_1000=1
+		tx=0
+		rx=0
+		device_name=eth1
+
+		[/sys/class/leds/stmmac-1:01:amber:lan]
+		trigger=netdev
+		interval=52
+		link_10=0
+		link_100=0
+		link_1000=0
+		tx=1
+		rx=1
+		device_name=eth0
+
+		[/sys/class/leds/stmmac-1:01:green:lan]
+		trigger=netdev
+		interval=52
+		link_10=1
+		link_100=1
+		link_1000=1
+		tx=0
+		rx=0
+		device_name=eth0
+	EOF
+}