net: sparx5: add the basic sparx5 driver

This adds the Sparx5 basic SwitchDev driver framework with IO range
mapping, switch device detection and core clock configuration.

Support for ports, phylink, netdev, mactable etc. are in the following
patches.

Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Signed-off-by: Bjarni Jonasson <bjarni.jonasson@microchip.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/microchip/Kconfig

@@ -54,4 +54,6 @@ config LAN743X
 	  To compile this driver as a module, choose M here. The module will be
 	  called lan743x.
 
+source "drivers/net/ethernet/microchip/sparx5/Kconfig"
+
 endif # NET_VENDOR_MICROCHIP

drivers/net/ethernet/microchip/Makefile

@@ -8,3 +8,5 @@ obj-$(CONFIG_ENCX24J600) += encx24j600.o encx24j600-regmap.o
 obj-$(CONFIG_LAN743X) += lan743x.o
 
 lan743x-objs := lan743x_main.o lan743x_ethtool.o lan743x_ptp.o
+
+obj-$(CONFIG_SPARX5_SWITCH) += sparx5/

drivers/net/ethernet/microchip/sparx5/Kconfig

@@ -0,0 +1,9 @@
+config SPARX5_SWITCH
+	tristate "Sparx5 switch driver"
+	depends on NET_SWITCHDEV
+	depends on HAS_IOMEM
+	select PHYLINK
+	select PHY_SPARX5_SERDES
+	select RESET_CONTROLLER
+	help
+	  This driver supports the Sparx5 network switch device.

drivers/net/ethernet/microchip/sparx5/Makefile

@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Makefile for the Microchip Sparx5 network device drivers.
+#
+
+obj-$(CONFIG_SPARX5_SWITCH) += sparx5-switch.o
+
+sparx5-switch-objs  := sparx5_main.o