linux-kernel - Re: [PATCH v4 0/8] Device Tree support for the at91sam9261ek

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Date:	Wed, 12 Feb 2014 13:44:28 +0100
From:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
To:	Jean-Jacques Hiblot <jjhiblot@...phandler.com>
Cc:	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	boris brezillon <b.brezillon@...rkiz.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 0/8] Device Tree support for the at91sam9261ek

Dear Jean-Jacques Hiblot,

On Wed, 12 Feb 2014 13:36:08 +0100, Jean-Jacques Hiblot wrote:

> >> For dm9000 the issue is (again) related to an ordering problem:
> >> the Ethernet need an interrupt provided by the gpio driver. Unfortunately,
> >> the gpio driver initialization is called after the dm900 driver
> >> initialization.
> >
> > And -EPROBE_DEFER doesn't solve this problem?
> not really the problem happens before the driver is actually probed
> when the ressource for the platform driver are filled

Sorry, I don't have all the context. If I understand correctly what you
mean, the GPIO driver is probed through the DT, but the DM9000 driver
is probed in a legacy way from the board file, and you have the case
where the DM9000 platform_device gets registered before the GPIOs are
actually available? In this case, what about having the
of_platform_populate() call *before* the platform_device_register() for
your DM9000 ? Again, I don't have all the context, so I might very well
be getting the situation incorrectly.

Of course, ideally, the DM9000 driver should be probed using the DT,
but I guess this needs the SMC DT binding that is still being
discussed, if I followed correctly.

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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