net: hisilicon: Add Fast Ethernet MAC driver

This patch adds the Hisilicon Fast Ethernet MAC(FEMAC) driver.
The FEMAC supports max speed 100Mbps and has been used in many
Hisilicon SoC.
Signed-off-by: Dongpo Li <lidongpo@hisilicon.com>
Reviewed-by: Jiancheng Xue <xuejiancheng@hisilicon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/devicetree/bindings/net/hisilicon-femac.txt

+Hisilicon Fast Ethernet MAC controller
+
+Required properties:
+- compatible: should contain one of the following version strings:
+	* "hisilicon,hisi-femac-v1"
+	* "hisilicon,hisi-femac-v2"
+	and the soc string "hisilicon,hi3516cv300-femac".
+- reg: specifies base physical address(s) and size of the device registers.
+  The first region is the MAC core register base and size.
+  The second region is the global MAC control register.
+- interrupts: should contain the MAC interrupt.
+- clocks: A phandle to the MAC main clock.
+- resets: should contain the phandle to the MAC reset signal(required) and
+	the PHY reset signal(optional).
+- reset-names: should contain the reset signal name "mac"(required)
+	and "phy"(optional).
+- mac-address: see ethernet.txt [1].
+- phy-mode: see ethernet.txt [1].
+- phy-handle: see ethernet.txt [1].
+- hisilicon,phy-reset-delays-us: triplet of delays if PHY reset signal given.
+	The 1st cell is reset pre-delay in micro seconds.
+	The 2nd cell is reset pulse in micro seconds.
+	The 3rd cell is reset post-delay in micro seconds.
+
+[1] Documentation/devicetree/bindings/net/ethernet.txt
+
+Example:
+	hisi_femac: ethernet@10090000 {
+		compatible = "hisilicon,hi3516cv300-femac","hisilicon,hisi-femac-v2";
+		reg = <0x10090000 0x1000>,<0x10091300 0x200>;
+		interrupts = <12>;
+		clocks = <&crg HI3518EV200_ETH_CLK>;
+		resets = <&crg 0xec 0>,<&crg 0xec 3>;
+		reset-names = "mac","phy";
+		mac-address = [00 00 00 00 00 00];
+		phy-mode = "mii";
+		phy-handle = <&phy0>;
+		hisilicon,phy-reset-delays-us = <10000 20000 20000>;
+	};

drivers/net/ethernet/hisilicon/Kconfig

@@ -23,6 +23,18 @@ config HIX5HD2_GMAC
 	help
 	  This selects the hix5hd2 mac family network device.
 
+config HISI_FEMAC
+	tristate "Hisilicon Fast Ethernet MAC device support"
+	depends on HAS_IOMEM
+	select PHYLIB
+	select RESET_CONTROLLER
+	help
+	  This selects the Hisilicon Fast Ethernet MAC device(FEMAC).
+	  The FEMAC receives and transmits data over Ethernet
+	  ports at 10/100 Mbps in full-duplex or half-duplex mode.
+	  The FEMAC exchanges data with the CPU, and supports
+	  the energy efficient Ethernet (EEE).
+
 config HIP04_ETH
 	tristate "HISILICON P04 Ethernet support"
 	depends on HAS_IOMEM	# For MFD_SYSCON

drivers/net/ethernet/hisilicon/Makefile

@@ -6,3 +6,4 @@ obj-$(CONFIG_HIX5HD2_GMAC) += hix5hd2_gmac.o
 obj-$(CONFIG_HIP04_ETH) += hip04_eth.o
 obj-$(CONFIG_HNS_MDIO) += hns_mdio.o
 obj-$(CONFIG_HNS) += hns/
+obj-$(CONFIG_HISI_FEMAC) += hisi_femac.o