ARM: at91: add basic support for new SoC family lan966

This patch introduces Microchip LAN966 ARMv7 based SoC family
of multiport gigabit AVB/TSN-capable ethernet switches.
It supports two SKUs: 4-port LAN9662 with multiprotocol
processing support and 8-port LAN9668 switch.

LAN966 family includes copper and serial ethernet interfaces,
peripheral interfaces such as PCIe, USB, TWI, SPI, UART, QSPI,
SD/eMMC, Parallel Interface (PI) as well as synchronization
and trigger inputs/outputs.
Signed-off-by: Kavyasree Kotagiri <kavyasree.kotagiri@microchip.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
[nicolas.ferre@microchip.com: merged patches for this SoC introduction]
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20210831102138.2476-1-kavyasree.kotagiri@microchip.com
Link: https://lore.kernel.org/r/20211004105926.5696-5-kavyasree.kotagiri@microchip.com

arch/arm/mach-at91/Kconfig

@@ -67,6 +67,15 @@ config SOC_SAMA7G5
 	help
 	  Select this if you are using one of Microchip's SAMA7G5 family SoC.
 
+config SOC_LAN966
+	bool "ARMv7 based Microchip LAN966 SoC family"
+	depends on ARCH_MULTI_V7
+	select DW_APB_TIMER_OF
+	select ARM_GIC
+	select MEMORY
+	help
+	  This enables support for ARMv7 based Microchip LAN966 SoC family.
+
 config SOC_AT91RM9200
 	bool "AT91RM9200"
 	depends on ARCH_MULTI_V4T