linux-kernel - Re: [PATCH 0/9] of/irq: Defer interrupt reference resolution

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Message-ID: <20130917124300.GB6757@ulmo>
Date:	Tue, 17 Sep 2013 14:43:01 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-i2c@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 0/9] of/irq: Defer interrupt reference resolution

On Tue, Sep 17, 2013 at 01:20:39PM +0200, Alexandre Belloni wrote:
> Hi Thierry,
> 
> On 16/09/2013 10:31, Thierry Reding wrote:
> > Hi,
> >
> > This small series allows interrupt references from the device tree to be
> > resolved at driver probe time, rather than at device creation time. The
> > current implementation resolves such references while devices are added
> > during the call to of_platform_populate(), which happens very early in
> > the boot process. This causes probe ordering issues, because all devices
> > that are an interrupt parent for other devices need to have been probed
> > by that time. This is worked around for primary interrupt controllers by
> > initializing them using a device tree specific way (of_irq_init()), but
> > it doesn't work for something like a GPIO controller that is itself a
> > platform device and an interrupt parent for other devices at the same
> > time.
[...]
> I believe this will solve the issue I was hitting back in June where
> of_i2c_register_devices() failed to get the IRQ while doing it at probe
> time was working fine:
> 
> http://www.spinics.net/lists/linux-i2c/msg12523.html
> 
> I couldn't test your patches yet though. I'll try to test as soon as I
> get some free time.

Yes, this series precisely aims at fixing situations as those. It'd be
great if you could give the series a spin to verify that it really works
for your case.

Thierry

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