net: davinci_mdio: reuse for keystone2 arch

The similar MDIO HW blocks is used by keystone 2 SoCs as
in Davinci SoCs:
- one in Gigabit Ethernet (GbE) Switch Subsystem
  See http://www.ti.com/lit/ug/sprugv9d/sprugv9d.pdf
- one in 10 Gigabit Ethernet Subsystem
  See http://www.ti.com/lit/ug/spruhj5/spruhj5.pdf

Hence, reuse Davinci MDIO driver for Keystone 2 and
enable TI networking for Keystone 2 devices
Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Reviewed-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/davinci-mdio.txt

-TI SoC Davinci MDIO Controller Device Tree Bindings
+TI SoC Davinci/Keystone2 MDIO Controller Device Tree Bindings
 ---------------------------------------------------
 
 Required properties:
-- compatible		: Should be "ti,davinci_mdio"
+- compatible		: Should be "ti,davinci_mdio" or "ti,keystone_mdio"
 - reg			: physical base address and size of the davinci mdio
 			  registers map
 - bus_freq		: Mdio Bus frequency
@@ -19,7 +19,7 @@ file.
 Examples:
 
 	mdio: davinci_mdio@4A101000 {
-		compatible = "ti,cpsw";
+		compatible = "ti,davinci_mdio";
 		reg = <0x4A101000 0x1000>;
 		bus_freq = <1000000>;
 	};
@@ -27,7 +27,7 @@ Examples:
 (or)
 
 	mdio: davinci_mdio@4A101000 {
-		compatible = "ti,cpsw";
+		compatible = "ti,davinci_mdio";
 		ti,hwmods = "davinci_mdio";
 		bus_freq = <1000000>;
 	};

drivers/net/ethernet/ti/Kconfig

@@ -5,7 +5,7 @@
 config NET_VENDOR_TI
 	bool "Texas Instruments (TI) devices"
 	default y
-	depends on PCI || EISA || AR7 || (ARM && (ARCH_DAVINCI || ARCH_OMAP3 || SOC_AM33XX))
+	depends on PCI || EISA || AR7 || (ARM && (ARCH_DAVINCI || ARCH_OMAP3 || SOC_AM33XX || ARCH_KEYSTONE))
 	---help---
 	  If you have a network (Ethernet) card belonging to this class, say Y
 	  and read the Ethernet-HOWTO, available from
@@ -32,7 +32,7 @@ config TI_DAVINCI_EMAC
 
 config TI_DAVINCI_MDIO
 	tristate "TI DaVinci MDIO Support"
-	depends on ARM && ( ARCH_DAVINCI || ARCH_OMAP3 || SOC_AM33XX )
+	depends on ARM && ( ARCH_DAVINCI || ARCH_OMAP3 || SOC_AM33XX || ARCH_KEYSTONE )
 	select PHYLIB
 	---help---
 	  This driver supports TI's DaVinci MDIO module.