From: Srinivas Kandagatla <redacted>

STi series SOCs have a glue layer on top of the synopsis gmac IP, this
glue layer needs to be configured before the gmac driver starts using
the IP.

This patch adds a platform driver for the glue layer which configures
the IP before stmmac driver takes over.

Signed-off-by: Srinivas Kandagatla <redacted>
---
 .../devicetree/bindings/net/sti-dwmac.txt          |   45 +++
 drivers/net/ethernet/stmicro/stmmac/Makefile       |    1 +
 drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c    |  294 ++++++++++++++++++++
 3 files changed, 340 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/net/sti-dwmac.txt
 create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-sti.c

diff --git a/Documentation/devicetree/bindings/net/sti-dwmac.txt b/Documentation/devicetree/bindings/net/sti-dwmac.txt
new file mode 100644
index 0000000..5431d9d
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/sti-dwmac.txt

@@ -0,0 +1,45 @@
+STMicroelectronics SoC DWMAC controller
+
+The device node has following properties.
+
+Required properties:
+ - compatible	: Can be "st,stih415-dwmac", "st,stih416-dwmac" or
+   "st,stid127-dwmac".
+ - reg		: Offset of the glue configuration register map in system
+   configuration regmap pointed by st,syscon property and size.
+ - st,syscon	: Should be phandle to system configuration node which
+   encompases this glue registers.
+ - st,tx-retime-src: This specifies which clk is wired up to the mac for
+   retimeing tx lines. This is totally board dependent and can take one of the
+   posssible values from "txclk", "clk_125", "phyclk" or "clkgen".
+
+Optional properties:
+ - resets	: phandle pointing to the system reset controller with correct
+   reset line index for ethernet reset.
+
+Sub-nodes:
+The dwmac core should be added as subnode to STMicroelectronics dwmac glue.
+- dwmac :	The binding details of dwmac can be found in
+  Documentation/devicetree/bindings/net/stmmac.txt
+
+Example:
+
+ethernet0: ethernet0{
+	#address-cells = <1>;
+	#size-cells = <1>;
+	compatible		= "st,stih415-dwmac";
+	reg			= <0x148 0x4>;
+	resets			= <&softreset STIH415_ETH0_SOFTRESET>;
+	st,syscon		= <&syscfg_rear>;
+	st,tx-retime-src	= "clk_125";
+	ranges;
+
+	dwmac0:dwmac@fe810000 {
+		device_type 	= "network";
+		compatible	= "snps,dwmac", "snps,dwmac-3.610";
+		reg 		= <0xfe810000 0x8000>;
+		interrupts 	= <0 147 0>;
+		interrupt-names = "macirq";
+		...
+	};
+};