net: Microchip encx24j600 driver

This ethernet driver supports the Micorchip enc424j600/626j600 Ethernet
controller over a SPI bus interface. This driver makes use of the regmap API to
optimize access to registers by caching registers where possible.

Datasheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/39935b.pdf

Signed-off-by: Jon Ringle <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

Author: ringlej

drivers/net/ethernet/microchip/Kconfig

@@ -33,4 +33,13 @@ config ENC28J60_WRITEVERIFY
 	  Enable the verify after the buffer write useful for debugging purpose.
 	  If unsure, say N.
 
+config ENCX24J600
+    tristate "ENCX24J600 support"
+    depends on SPI
+    ---help---
+      Support for the Microchip ENC424J600 ethernet chip.
+
+      To compile this driver as a module, choose M here. The module will be
+      called enc424j600.
+
 endif # NET_VENDOR_MICROCHIP

drivers/net/ethernet/microchip/Makefile

@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_ENC28J60) += enc28j60.o
+obj-$(CONFIG_ENCX24J600) += encx24j600.o encx24j600-regmap.o