imx: add Gateworks Venice support

Add support for Gateworks Venice imx8m family of boards:
 - required kernel modules for on-board devices
 - image generation
 - initial network config
 - sysupgrade support

The resulting compressed disk image
(bin/targets/imx/cortexa53/openwrt-imx-cortexa53-gateworks_venice-squashfs-img.gz)
can be installed on a Gateworks venice board via U-Boot:

u-boot=> tftpboot $loadaddr openwrt-imx-cortexa53-gateworks_venice-squashfs-img.gz && \
         gzwrite mmc $dev $loadaddr $filesize

WARNING: this will overwrite any boot firmware on the eMMC user hardware
partition which if being used will brick your board requiring JTAG to
re-program boot firmware and recover

The compressed disk image contains the partition table and filesystems only
and that it is expected that boot firmware is installed properly on the
eMMC boot0 hardware partition. The easiest way to ensure this is to
use the Gateworks JTAG adapter/process to install the latest boot firmware
as follows from a Linux host:
  wget http://dev.gateworks.com/jtag/jtag_usbv4
  chmod +x jtag_usbv4
  wget http://dev.gateworks.com/venice/images/firmware-venice-imx8mm.bin
  sudo ./jtag_usbv4 -p firmware-venice-imx8mm.bin

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

target/linux/imx/cortexa53/base-files/etc/board.d/02_network

@@ -0,0 +1,27 @@
+. /lib/functions/uci-defaults.sh
+
+board=$(board_name)
+
+board_config_update
+
+case "$board" in
+gw,imx8mm-gw72xx-0x|\
+gw,imx8mp-gw72xx-2x|\
+gw,imx8mm-gw73xx-0x|\
+gw,imx8mp-gw73xx-2x|\
+gw,imx8mm-gw7902-0x)
+	ucidef_set_interfaces_lan_wan 'eth1' 'eth0'
+	;;
+gw,imx8mm-gw7901)
+	ucidef_set_interfaces_lan_wan 'lan2 lan3 lan4' 'lan1'
+	;;
+gateworks,imx8mp-gw74xx)
+	ucidef_set_network_device_path "eth0" "platform/soc@0/30800000.bus/30bf0000.ethernet"
+	ucidef_set_network_device_path "eth1" "platform/soc@0/30800000.bus/30be0000.ethernet"
+	ucidef_set_interfaces_lan_wan 'lan1 lan2 lan3 lan4' 'eth1'
+	;;
+esac
+
+board_config_flush
+
+exit 0

target/linux/imx/cortexa53/base-files/lib/preinit/79_move_config

@@ -0,0 +1,17 @@
+. /lib/functions.sh
+. /lib/upgrade/common.sh
+
+move_config() {
+	local board=$(board_name)
+	local partdev
+
+	export_bootdevice && export_partdevice partdev 1 && {
+		mount -o rw,noatime "/dev/$partdev" /mnt
+		[ -f "/mnt/$BACKUP_FILE" ] && {
+			mv -f "/mnt/$BACKUP_FILE" /
+		}
+		umount /mnt
+	}
+}
+
+boot_hook_add preinit_mount_root move_config

target/linux/imx/cortexa53/base-files/lib/upgrade/platform.sh

@@ -0,0 +1,53 @@
+
+enable_image_metadata_check() {
+	case "$(board_name)" in
+	gw,imx8m*)
+		REQUIRE_IMAGE_METADATA=1
+		;;
+	esac
+}
+enable_image_metadata_check
+
+platform_check_image() {
+	local board=$(board_name)
+
+	case "$board" in
+	gw,imx8m*)
+		return 0
+		;;
+	esac
+
+	echo "Sysupgrade is not yet supported on $board."
+	return 1
+}
+
+platform_do_upgrade() {
+	local board=$(board_name)
+
+	case "$board" in
+	gw,imx8m*)
+		export_bootdevice && export_partdevice diskdev 0 || {
+			echo "Unable to find root device."
+			return 1
+		}
+		v "Updating /dev/$diskdev..."
+		get_image "$@" | dd of="/dev/$diskdev" bs=4096 conv=fsync
+		;;
+	esac
+}
+
+platform_copy_config() {
+	local board=$(board_name)
+	local partdev
+
+	case "$board" in
+	gw,imx8m*)
+		export_partdevice partdev 1 && {
+			v "Storing $UPGRADE_BACKUP on /dev/$partdev..."
+			mount -o rw,noatime "/dev/$partdev" /mnt
+			cp -af "$UPGRADE_BACKUP" "/mnt/$BACKUP_FILE"
+			umount /mnt
+		}
+		;;
+	esac
+}

target/linux/imx/cortexa53/config-default

@@ -45,6 +45,7 @@ CONFIG_CMA_AREAS=7
 # CONFIG_CMA_DEBUG is not set
 # CONFIG_CMA_DEBUGFS is not set
 # CONFIG_CMA_SYSFS is not set
+# CONFIG_COMMON_CLK_BD718XX is not set
 CONFIG_CONSOLE_TRANSLATIONS=y
 CONFIG_CONTIG_ALLOC=y
 CONFIG_CRYPTO_AES_ARM64=y
@@ -96,9 +97,16 @@ CONFIG_INTERCONNECT_IMX8MN=y
 CONFIG_INTERCONNECT_IMX8MP=y
 CONFIG_INTERCONNECT_IMX8MQ=y
 CONFIG_MEMORY_ISOLATION=y
+CONFIG_MFD_CORE=y
+CONFIG_MFD_ROHM_BD718XX=y
 # CONFIG_MMC_SDHCI_PCI is not set
 CONFIG_MODULES_USE_ELF_RELA=y
 CONFIG_NEED_SG_DMA_LENGTH=y
+# CONFIG_NET_DSA_MICROCHIP_KSZ8863_SMI is not set
+CONFIG_NET_DSA_MICROCHIP_KSZ9477_I2C=y
+CONFIG_NET_DSA_MICROCHIP_KSZ_COMMON=y
+# CONFIG_NET_DSA_MICROCHIP_KSZ_SPI is not set
+CONFIG_NET_DSA_TAG_KSZ=y
 CONFIG_NOP_USB_XCEIV=y
 CONFIG_PARTITION_PERCPU=y
 CONFIG_PCI=y
@@ -133,8 +141,11 @@ CONFIG_POWER_RESET=y
 CONFIG_POWER_SUPPLY=y
 CONFIG_QUEUED_RWLOCKS=y
 CONFIG_QUEUED_SPINLOCKS=y
+CONFIG_REGMAP_IRQ=y
+CONFIG_REGULATOR_BD718XX=y
 CONFIG_REGULATOR_MP5416=y
 CONFIG_REGULATOR_PCA9450=y
+CONFIG_REGULATOR_ROHM=y
 CONFIG_RESET_IMX7=y
 CONFIG_RODATA_FULL_DEFAULT_ENABLED=y
 CONFIG_SOC_IMX8M=y