Adds the documentation for XGMAC2 DT bindings.

Signed-off-by: Jose Abreu <joab...@synopsys.com>
Cc: David S. Miller <da...@davemloft.net>
Cc: Joao Pinto <jpi...@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavall...@st.com>
Cc: Alexandre Torgue <alexandre.tor...@st.com>
Cc: Sergei Shtylyov <sergei.shtyl...@cogentembedded.com>
Cc: devicet...@vger.kernel.org
Cc: Rob Herring <robh...@kernel.org>
---
Changes from v3:
        - Remove driver mention (Rob)
Changes from v1:
        - Correct header, now we also support 2.5/10G.
        - Add missing '>' (Sergei)
---
 Documentation/devicetree/bindings/net/stmmac.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/stmmac.txt 
b/Documentation/devicetree/bindings/net/stmmac.txt
index 3a28a5d8857d..7f1385c4643d 100644
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -1,7 +1,8 @@
-* STMicroelectronics 10/100/1000 Ethernet driver (GMAC)
+* STMicroelectronics 10/100/1000/2500/10000 Ethernet (GMAC/XGMAC)
 
 Required properties:
-- compatible: Should be "snps,dwmac-<ip_version>", "snps,dwmac"
+- compatible: Should be "snps,dwmac-<ip_version>", "snps,dwmac" or
+       "snps,dwxgmac-<ip_version>", "snps,dwxgmac".
        For backwards compatibility: "st,spear600-gmac" is also supported.
 - reg: Address and length of the register set for the device
 - interrupt-parent: Should be the phandle for the interrupt controller
-- 
2.7.4


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