board: add Orangepi Zero3 support

Add initial support for Orangepi Zero3 board:
- U-Boot 2021.07 fork by Orangepi
- Linux 6.1.31 fork by Orangepi
- Default packages from buildroot

Enable CONFIG_MFD_AC200 as it is used directly by other module,
resulting in build failure when disabled.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Tested-by: Sergey Kuzminov <kuzminov.sergey81@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

DEVELOPERS

@@ -1963,8 +1963,10 @@ F:	package/ecryptfs-utils/
 N:	Marcin Niestroj <m.niestroj@grinn-global.com>
 F:	board/grinn/
 F:	board/orangepi/orangepi-zero-plus/
+F:	board/orangepi/orangepi-zero3/
 F:	configs/grinn_*
 F:	configs/orangepi_zero_plus_defconfig
+F:	configs/orangepi_zero3_defconfig
 F:	package/argparse/
 F:	package/dt-utils/
 F:	package/easydbus/

board/orangepi/orangepi-zero3/linux.config

@@ -0,0 +1 @@
+CONFIG_MFD_AC200=y

board/orangepi/orangepi-zero3/readme.txt

@@ -0,0 +1,34 @@
+Intro
+=====
+
+This default configuration will allow you to start experimenting with the
+buildroot environment for the Orangepi Zero3. With the current configuration
+it will bring-up the board, and allow access through the serial console.
+
+Orangepi Zero3 link:
+http://www.orangepi.org/html/hardWare/computerAndMicrocontrollers/details/Orange-Pi-Zero-3.html
+
+This configuration uses Orangepi's fork of U-Boot and Linux kernel.
+
+How to build
+============
+
+    $ make orangepi_zero3_defconfig
+    $ make
+
+Note: you will need access to the internet to download the required
+sources.
+
+How to write the SD card
+========================
+
+Once the build process is finished you will have an image called "sdcard.img"
+in the output/images/ directory.
+
+Copy the bootable "sdcard.img" onto an SD card with "dd":
+
+  $ sudo dd if=output/images/sdcard.img of=/dev/sdX
+  $ sudo sync
+
+Insert the micro SDcard in your Orangepi Zero3 and power it up. The console
+is on the serial line, 115200 8N1.

configs/orangepi_zero3_defconfig

@@ -0,0 +1,57 @@
+BR2_aarch64=y
+BR2_cortex_a53=y
+BR2_ARM_FPU_VFPV4=y
+
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_1=y
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV=y
+BR2_SYSTEM_DHCP="eth0"
+
+# Firmware
+BR2_TARGET_ARM_TRUSTED_FIRMWARE=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION_VALUE="v2.9"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM="sun50i_h616"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_BL31=y
+
+# Bootloader
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_TARBALL=y
+BR2_TARGET_UBOOT_CUSTOM_TARBALL_LOCATION="$(call github,orangepi-xunlong,u-boot-orangepi,6fe17fac388aad17490cf386578b7532975e567f)/u-boot-orangepi-6fe17fac388aad17490cf386578b7532975e567f.tar.gz"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="orangepi_zero3"
+BR2_TARGET_UBOOT_NEEDS_DTC=y
+BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
+BR2_TARGET_UBOOT_NEEDS_PYTHON3=y
+BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
+BR2_TARGET_UBOOT_NEEDS_ATF_BL31=y
+BR2_TARGET_UBOOT_SPL=y
+BR2_TARGET_UBOOT_SPL_NAME="u-boot-sunxi-with-spl.bin"
+BR2_TARGET_UBOOT_CUSTOM_MAKEOPTS="SCP=/dev/null"
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
+BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,orangepi-xunlong,linux-orangepi,3495b5ee0594566c9fed930b96b1cae90600412e)/linux-orangepi-3495b5ee0594566c9fed930b96b1cae90600412e.tar.gz"
+BR2_LINUX_KERNEL_DEFCONFIG="linux_sunxi64"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="allwinner/sun50i-h616-orangepi-zero3"
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
+BR2_LINUX_KERNEL_DTB_KEEP_DIRNAME=y
+BR2_LINUX_KERNEL_CONFIG_FRAGMENT_FILES="board/orangepi/orangepi-zero3/linux.config"
+
+# Filesystem
+BR2_TARGET_GENERIC_ISSUE="Welcome to Orangepi Zero3"
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="180M"
+# BR2_TARGET_ROOTFS_TAR is not set
+
+# host tools
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS=y
+
+# image scripts
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/orangepi/common/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c $(BINARIES_DIR)/genimage.cfg"