net: stmmac: add fix_mac_speed support for socfpga

This patch adds fix_mac_speed() support for
Altera socfpga Ethernet controller. Emac splitter is a
soft IP core in FPGA system that converts GMII interface from
Synopsys mac to RGMII/SGMII interface. This splitter core is
an optional IP if user would like to use RGMII/SGMII
interface in their system. Software needs to update a register
in splitter core when there is speed change.

Signed-off-by: Ley Foon Tan <lftan@altera.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/net/socfpga-dwmac.txt b/Documentation/devicetree/bindings/net/socfpga-dwmac.txt
index 2a60cd3e8d5d..3a9d67951606 100644
--- a/Documentation/devicetree/bindings/net/socfpga-dwmac.txt
+++ b/Documentation/devicetree/bindings/net/socfpga-dwmac.txt
@@ -12,6 +12,10 @@ Required properties:
  - altr,sysmgr-syscon : Should be the phandle to the system manager node that
    encompasses the glue register, the register offset, and the register shift.
 
+Optional properties:
+altr,emac-splitter: Should be the phandle to the emac splitter soft IP node if
+                DWMAC controller is connected emac splitter.
+
 Example:
 
 gmac0: ethernet@ff700000 {