linux-kernel - Re: [PATCH 2/3] net/fec: add device tree support

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Message-Id: <201106182027.22974.arnd@arndb.de>
Date:	Sat, 18 Jun 2011 20:27:22 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Shawn Guo <shawn.guo@...aro.org>, patches@...aro.org,
	netdev@...r.kernel.org, devicetree-discuss@...ts.ozlabs.org,
	Jason Liu <jason.hui@...aro.org>, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>
Subject: Re: [PATCH 2/3] net/fec: add device tree support

On Saturday 18 June 2011 17:19:13 Shawn Guo wrote:
> diff --git a/Documentation/devicetree/bindings/net/fsl-fec.txt b/Documentation/devicetree/bindings/net/fsl-fec.txt
> new file mode 100644
> index 0000000..705111d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/fsl-fec.txt
> @@ -0,0 +1,14 @@
> +* Freescale Fast Ethernet Controller (FEC)
> +
> +Required properties:
> +- compatible : should be "fsl,<soc>-fec", "fsl,fec"
> +- reg : address and length of the register set for the device
> +- interrupts : should contain fec interrupt
> +
> +Example:
> +
> +fec@...ec000 {
> +	compatible = "fsl,imx51-fec", "fsl,fec";
> +	reg = <0x83fec000 0x4000>;
> +	interrupts = <87>;
> +};

How about also adding device_type="network" as required here, so you
inherit the attributes like "local-mac-address".

I would also suggest adding a call to of_get_mac_address() so you
can read the address out of the device tree when it is not configured
in hardware. Today, the driver relies on a module parameter or
platform_data on hardware with a mac address set.

The other information that is currently encoded in platform_data
is the phy mode. How about adding a property that enables RMII mode
when present?

	Arnd
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