[PATCH net-next v5 1/2] dts: Add a binding for Synopsys emac max-frame-size

[Vince Bridgers <vbridgers2013@gmail.com>]

This change adds a parameter for the Synopsys 10/100/1000
stmmac Ethernet driver to configure the maximum frame
size supported by the EMAC driver. Synopsys allows the FIFO
sizes to be configured when the cores are built for a particular
device, but do not provide a way for the driver to read
information from the device about the maximum MTU size
supported as limited by the device's FIFO size.

Signed-off-by: Vince Bridgers <vbridgers2013@gmail.com>
---
V5: simplify comment on use of max-frame-size
V4: add comments to explain use of max-frame-size with respect
    to inconsistent definition and use in the ePAPR v1.1 spec
V3: change snps,max-frame-size to max-frame-size
V2: change snps,max-mtu to snps,max-frame-size
---
 Documentation/devicetree/bindings/net/stmmac.txt |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
index eba0e5e..95ddb16 100644
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt
@@ -29,7 +29,9 @@ Required properties:
 				ignored if force_thresh_dma_mode is set.
 
 Optional properties:
-- mac-address: 6 bytes, mac address
+- mac-address:		6 bytes, mac address
+- max-frame-size:	Maximum Transfer Unit (IEEE defined MTU), rather
+			than the maximum frame size.
 
 Examples:
 
@@ -40,5 +42,6 @@ Examples:
 		interrupts = <24 23>;
 		interrupt-names = "macirq", "eth_wake_irq";
 		mac-address = [000000000000]; /* Filled in by U-Boot */
+		max-frame-size = <3800>;
 		phy-mode = "gmii";
 	};
-- 
1.7.9.5