[PATCH net-next v4 1/2] dts: Add a binding for Synopsys emac max-frame-size
From: Vince Bridgers <hidden>
Date: 2014-01-16 14:05:54
Also in:
linux-devicetree
Subsystem:
networking drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
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 <redacted>
---
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 | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
index eba0e5e..d553be2 100644
--- a/Documentation/devicetree/bindings/net/stmmac.txt
+++ b/Documentation/devicetree/bindings/net/stmmac.txt@@ -29,7 +29,17 @@ 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 frame size permitted. This parameter is useful + since different implementations of the Synopsys MAC may + have different FIFO sizes depending on the selections + made in Synopsys Core Consultant. Note that the usage + is inconsistent with the definition in the ePAPR v1.1 + specification, as it defines max-frame-size inclusive + of the MAC DA, SA, Ethertype and CRC while usage is + consistent with the IEEE definition of MAC Client + Data, which is sans the MAC DA, SA, Ethertype and + CRC. Examples:
@@ -40,5 +50,6 @@ 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