sunxi: Add Linksprite_pcDuino3_Nano board / defconfig

This is a low-cost Allwinner A20 board with Arduino-style GPIO headers;
it features 1G RAM, 4G NAND flash, 1 micro-SD, 2 USB sockets, 1 micro
USB socket for OTG and another for power in, HDMI, SATA, 5V power for
SATA devices, gigabit Ethernet, an IR receiver, 3.5mm audio out and a
MIPI camera connector.

Like the BananaPi, this board needs GMAC_TX_DELAY set to 3 in order for
GMAC to work reliably at gigabit speeds.

For more details, see: http://linux-sunxi.org/LinkSprite_pcDuino3_Nano

Signed-off-by: Adam Sampson <ats@offog.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

board/sunxi/MAINTAINERS

@@ -81,6 +81,11 @@ M:	Zoltan Herpai <wigyori@uid0.hu>
 S:	Maintained
 F:	configs/Linksprite_pcDuino_defconfig
 
+LINKSPRITE-PCDUINO3-NANO BOARD
+M:	Adam Sampson <ats@offog.org>
+S:	Maintained
+F:	configs/Linksprite_pcDuino3_Nano_defconfig
+
 MARSBOARD-A10 BOARD
 M:	Aleksei Mamlin <mamlinav@gmail.com>
 S:	Maintained

configs/Linksprite_pcDuino3_Nano_defconfig

@@ -0,0 +1,11 @@
+CONFIG_SPL=y
+CONFIG_SYS_EXTRA_OPTIONS="AXP209_POWER,SUNXI_GMAC,RGMII,AHCI,SATAPWR=SUNXI_GPH(2),USB_EHCI"
+CONFIG_FDTFILE="sun7i-a20-pcduino3-nano.dtb"
+CONFIG_GMAC_TX_DELAY=3
+CONFIG_USB1_VBUS_PIN="PH11"
++S:CONFIG_ARM=y
++S:CONFIG_ARCH_SUNXI=y
++S:CONFIG_MACH_SUN7I=y
++S:CONFIG_DRAM_CLK=408
++S:CONFIG_DRAM_ZQ=122
++S:CONFIG_DRAM_EMR1=4