linux-kernel - Re: [PATCH] ARM: mvebu: add Device Tree for the Armada 385 RD board

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Message-ID: <20140306144600.GM4780@lunn.ch>
Date:	Thu, 6 Mar 2014 15:46:00 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	Andrew Lunn <andrew@...n.ch>, Jason Cooper <jason@...edaemon.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	linux-arm-kernel@...ts.infradead.org,
	Lior Amsalem <alior@...vell.com>,
	Tawfik Bayouk <tawfik@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: mvebu: add Device Tree for the Armada 385 RD board

> >>> I think you can use aliases to get the order correct, independent of
> >>> how you list them in DT. That should be a lot safer than assuming
> >>> things are instantiated from top to bottom.
> >>
> >> It sounds interesting, how would you do this?
> > 
> > As there already is in armada-370-xp.dtsi
> > 
> >         aliases {
> >                 eth0 = &eth0;
> >                 eth1 = &eth1;
> >         };
> > 
> > 
> > 	eth0: ethernet@...00 {
> > 	}
> >         eth1: ethernet@...00 {
> > 	}
> > 
> > This at least works for i2c devices. The pdev->id is set using the
> > alias number.
> 
> Well I think it doesn't work with ethernet devices because we already do
> this in aramda-38x.dtsi:
> 
> 	aliases {
> 		gpio0 = &gpio0;
> 		gpio1 = &gpio1;
> 		eth0 = &eth0;
> 		eth1 = &eth1;
> 		eth2 = &eth2;
> 	};
> 
> 	eth1: ethernet@...00 {
> 	}
> 	eth2: ethernet@...00 {
> 	}
> 	eth0: ethernet@...00 {
> 	}

Ah, Erm, O.K. 

It seems to be an i2c thing. Take a look at i2c_add_adapter().

        if (dev->of_node) {
                id = of_alias_get_id(dev->of_node, "i2c");
 
You could put something similar into the ethernet driver.

    Andrew
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