From mboxrd@z Thu Jan 1 00:00:00 1970 From: Vince Bridgers Subject: [PATCH net-next v4 1/2] dts: Add a binding for Synopsys emac max-frame-size Date: Thu, 16 Jan 2014 08:05:54 -0600 Message-ID: <1389881155-9758-2-git-send-email-vbridgers2013@gmail.com> References: <1389881155-9758-1-git-send-email-vbridgers2013@gmail.com> Cc: peppe.cavallaro@st.com, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, dinguyen@altera.com, rayagond@vayavyalabs.com, vbridgers2013@gmail.com To: devicetree@vger.kernel.org, netdev@vger.kernel.org Return-path: Received: from mail-pd0-f181.google.com ([209.85.192.181]:44303 "EHLO mail-pd0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752725AbaAPOLB (ORCPT ); Thu, 16 Jan 2014 09:11:01 -0500 In-Reply-To: <1389881155-9758-1-git-send-email-vbridgers2013@gmail.com> Sender: netdev-owner@vger.kernel.org List-ID: 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 --- 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