sunxi: Add support for Cubieboard4

The Cubieboard4 is an A80 SoC based development board from Cubietech.

This board has a UART port, 4 USB host ports, a USB 3.0 OTG connector,
HDMI and VGA outputs, a micro SD slot, 8G eMMC flash, 2G DRAM, a WiFi/BT
combo chip, headphone and microphone jacks, IR receiver, and GPIO headers.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

board/sunxi/MAINTAINERS

@@ -122,6 +122,11 @@ F:	include/configs/sun7i.h
 F:	configs/Cubieboard2_defconfig
 F:	configs/Cubietruck_defconfig
 
+CUBIEBOARD4 BOARD
+M:	Chen-Yu Tsai <wens@csie.org>
+S:	Maintained
+F:	configs/Cubieboard4_defconfig
+
 CUBIETRUCK-PLUS BOARD
 M:	Chen-Yu Tsai <wens@csie.org>
 S:	Maintained

configs/Cubieboard4_defconfig

+CONFIG_ARM=y
+CONFIG_ARCH_SUNXI=y
+CONFIG_MACH_SUN9I=y
+CONFIG_DRAM_CLK=672
+CONFIG_MMC0_CD_PIN="PH18"
+CONFIG_MMC_SUNXI_SLOT_EXTRA=2
+CONFIG_USB0_VBUS_PIN="AXP0-VBUS-ENABLE"
+CONFIG_USB0_VBUS_DET="AXP0-VBUS-DETECT"
+CONFIG_USB0_ID_DET="PH16"
+CONFIG_USB1_VBUS_PIN="PH14"
+CONFIG_USB3_VBUS_PIN="PH15"
+CONFIG_AXP_GPIO=y
+CONFIG_DEFAULT_DEVICE_TREE="sun9i-a80-cubieboard4"
+CONFIG_SPL=y
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_FLASH is not set
+# CONFIG_CMD_FPGA is not set
+CONFIG_AXP809_POWER=y