netdev - Re: [PATCH v4 3/9] Documentation: bindings: net: add the Marvell PXA168 Ethernet controller

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Date:	Tue, 23 Sep 2014 18:29:48 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	thomas.petazzoni@...e-electrons.com, zmxu@...vell.com,
	devicetree@...r.kernel.org, netdev@...r.kernel.org,
	Antoine Tenart <antoine.tenart@...e-electrons.com>,
	linux-kernel@...r.kernel.org, alexandre.belloni@...e-electrons.com,
	jszhang@...vell.com
Subject: Re: [PATCH v4 3/9] Documentation: bindings: net: add the Marvell PXA168 Ethernet controller

On Tuesday 23 September 2014 17:45:52 Sebastian Hesselbarth wrote:
> For reference, this is what we have for MVEBU SoCs with multiple ports
> per controller:
> 
> eth: ethernet-ctrl@...00 {
>         compatible = "marvell,orion-eth";
>         #address-cells = <1>;
>         #size-cells = <0>;
>         reg = <0x72000 0x4000>;
>         clocks = <&gate_clk 2>;
>         marvell,tx-checksum-limit = <1600>;
>         status = "disabled";
> 
>         ethernet-port@0 {
>                 compatible = "marvell,orion-eth-port";
>                 reg = <0>;
>                 interrupts = <29>;
>                 /* overwrite MAC address in bootloader */
>                 local-mac-address = [00 00 00 00 00 00];
>                 phy-handle = <&ethphy>;
>         };
> };
> 
> mdio: mdio-bus@...04 {
>         compatible = "marvell,orion-mdio";
>         #address-cells = <1>;
>         #size-cells = <0>;
>         reg = <0x72004 0x84>;
>         interrupts = <30>;
>         clocks = <&gate_clk 2>;
>         status = "disabled";
>         ethphy: ethernet-phy {
>                 /* set phy address in board file */
>         };
> };
> 

But in this example, you have the same registers and the same
clocks in two nodes, which are even used by the same device driver
at the moment. It's not a big issue, but my feeling is that Antoine's
approach was actually better because it more closely reflects
the way that the hardware is built.

	Arnd
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