netdev - Re: [PATCH net-next v2 1/2] dts: Add a binding for Synopsys emac max-frame-size

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Date:	Tue, 14 Jan 2014 09:57:36 -0600
From:	Dinh Nguyen <dinguyen@...era.com>
To:	Vince Bridgers <vbridgers2013@...il.com>
CC:	<devicetree@...r.kernel.org>, <netdev@...r.kernel.org>,
	<peppe.cavallaro@...com>, <robh+dt@...nel.org>,
	<pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<rayagond@...avyalabs.com>
Subject: Re: [PATCH net-next v2 1/2] dts: Add a binding for Synopsys emac
 max-frame-size

On Tue, 2014-01-14 at 08:40 -0600, Vince Bridgers wrote:
> 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@...il.com>
> ---
>  Documentation/devicetree/bindings/net/stmmac.txt |    5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/stmmac.txt b/Documentation/devicetree/bindings/net/stmmac.txt
> index eba0e5e..26a0ba9 100644
> --- a/Documentation/devicetree/bindings/net/stmmac.txt
> +++ b/Documentation/devicetree/bindings/net/stmmac.txt
> @@ -30,6 +30,10 @@ Required properties:
>  
>  Optional properties:
>  - mac-address: 6 bytes, mac address
> +- snps,max-frame-size:	Maximum frame size permitted. This parameter is useful 

I don't think max-frame-size should be a snps-only binding.

Dinh
> +			since different implementations of the Synopsys MAC may 
> +			have different FIFO sizes depending on the selections
> +			made in Synopsys Core Consultant.


>  
>  Examples:
>  
> @@ -40,5 +44,6 @@ Examples:
>  		interrupts = <24 23>;
>  		interrupt-names = "macirq", "eth_wake_irq";
>  		mac-address = [000000000000]; /* Filled in by U-Boot */
> +		snps,max-frame-size = <3800>;
>  		phy-mode = "gmii";
>  	};



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