arm64: sparx5: Add support for Microchip 2xA53 SoC

This adds support for the Microchip Sparx5 ARMv8-based SoC family of
TSN-capable gigabit switches.

Link: https://lore.kernel.org/r/20200615133242.24911-3-lars.povlsen@microchip.com
Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

MAINTAINERS

@@ -2119,6 +2119,14 @@ X:	drivers/net/wireless/atmel/
 N:	at91
 N:	atmel
 
+ARM/Microchip Sparx5 SoC support
+M:	Lars Povlsen <lars.povlsen@microchip.com>
+M:	Steen Hegelund <Steen.Hegelund@microchip.com>
+M:	Microchip Linux Driver Support <UNGLinuxDriver@microchip.com>
+L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
+S:	Supported
+N:	sparx5
+
 ARM/MIOA701 MACHINE SUPPORT
 M:	Robert Jarzmik <robert.jarzmik@free.fr>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)

arch/arm64/Kconfig.platforms

@@ -89,6 +89,20 @@ config ARCH_EXYNOS
 	help
 	  This enables support for ARMv8 based Samsung Exynos SoC family.
 
+config ARCH_SPARX5
+	bool "ARMv8 based Microchip Sparx5 SoC family"
+	select PINCTRL
+	select DW_APB_TIMER_OF
+	help
+	  This enables support for the Microchip Sparx5 ARMv8-based
+	  SoC family of TSN-capable gigabit switches.
+
+	  The SparX-5 Ethernet switch family provides a rich set of
+	  switching features such as advanced TCAM-based VLAN and QoS
+	  processing enabling delivery of differentiated services, and
+	  security through TCAM-based frame processing using versatile
+	  content aware processor (VCAP).
+
 config ARCH_K3
 	bool "Texas Instruments Inc. K3 multicore SoC architecture"
 	select PM_GENERIC_DOMAINS if PM