sunxi: add support for NetCube Systems Kumquat

NetCube Systems Kumquat is a board based on the Allwinner V3s SoC,
including:

- 64MB DDR2 included in SoC
- 10/100 Mbps Ethernet
- USB-C DRD
- Audio Codec
- Isolated CAN-FD
- ESP32 over SDIO
- 8MB SPI-NOR Flash for bootloader
- I2C EEPROM for MAC addresses
- SDIO Connector for eMMC or SD-Card
- 8x 12/24V IOs, 4x normally open relays
- DS3232 RTC with Battery Backup
- QWIIC connectors for external I2C devices

Signed-off-by: Lukas Schmid <lukas.schmid@netcube.li>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>

board/sunxi/MAINTAINERS

@@ -408,6 +408,11 @@ M:	Jagan Teki <jagan@amarulasolutions.com>
 S:	Maintained
 F:	configs/nanopi_a64_defconfig
 
+NETCUBE KUMQUAT BOARD
+M:	Lukas Schmid <lukas.schmid@netcube.li>
+S:	Maintained
+F:	configs/netcube_kumquat_defconfig
+
 NINTENDO NES CLASSIC EDITION BOARD
 M:	FUKAUMI Naoki <naobsd@gmail.com>
 S:	Maintained

configs/netcube_kumquat_defconfig

@@ -0,0 +1,43 @@
+CONFIG_ARM=y
+CONFIG_ARCH_SUNXI=y
+CONFIG_SF_DEFAULT_SPEED=40000000
+CONFIG_DEFAULT_DEVICE_TREE="allwinner/sun8i-v3s-netcube-kumquat"
+CONFIG_SPL=y
+CONFIG_MACH_SUN8I_V3S=y
+CONFIG_SPL_SPI_SUNXI=y
+# CONFIG_HAS_ARMV7_SECURE_BASE is not set
+# CONFIG_TIMESTAMP is not set
+CONFIG_BOOTDELAY=1
+CONFIG_PREBOOT=""
+# CONFIG_SYS_DEVICE_NULLDEV is not set
+CONFIG_SPL_MTD=y
+CONFIG_SYS_PROMPT="Kumquat> "
+CONFIG_CMD_EEPROM=y
+CONFIG_CMD_I2C=y
+CONFIG_CMD_MTD=y
+CONFIG_MTDIDS_DEFAULT="nor0=firmware"
+CONFIG_MTDPARTS_DEFAULT="mtdparts=firmware:960k(u-boot)ro,64k(u-boot-env),-(user)"
+CONFIG_CMD_DIAG=y
+# CONFIG_ENV_IS_IN_FAT is not set
+CONFIG_ENV_SPI_MAX_HZ=1000000
+CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG=y
+CONFIG_USE_HOSTNAME=y
+CONFIG_HOSTNAME="kumquat"
+CONFIG_VERSION_VARIABLE=y
+# CONFIG_USB_FUNCTION_FASTBOOT is not set
+CONFIG_SYS_I2C_MVTWSI=y
+CONFIG_MISC=y
+CONFIG_NVMEM=y
+CONFIG_I2C_EEPROM=y
+CONFIG_SYS_I2C_EEPROM_ADDR=0x50
+CONFIG_MTD=y
+CONFIG_SPI_FLASH_WINBOND=y
+CONFIG_SPI_FLASH_MTD=y
+CONFIG_SUN8I_EMAC=y
+CONFIG_PHY_SUN4I_USB=y
+CONFIG_DM_RTC=y
+CONFIG_RTC_DS3232=y
+CONFIG_SPI=y
+CONFIG_USB_MUSB_HOST=y
+CONFIG_USB_MUSB_GADGET=y
+# CONFIG_USB_ETHER is not set