linux-kernel - Re: virtual irq isssue

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Date:	Thu, 7 Mar 2013 17:22:35 +0530
From:	Ashish Jangam <ashish.jangam@...tcummins.com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	<linux-kernel@...r.kernel.org>,
	David Dajun Chen <dchen@...semi.com>
Subject: Re: virtual irq isssue - regmap_irq

On Thu, 2013-03-07 at 15:13 +0800, Mark Brown wrote:
> On Thu, Mar 07, 2013 at 12:27:52PM +0530, Ashish Jangam wrote:
> 
> > In regmap_irq if irq_base is unknown then regmap creates virq starting from 0
> > and it seems that in kernel 3.8 virq 0 usage is not permitted, since during irq
> > registration kernel throws a message "error: irq_desc already associated".
> 
> > I'm not sure if this requires fix in regmap_irq or kernel, can you please
> > comment on this?
> 
> This is a bug in your platform which will affect anything using a linear
> domain.  The platform isn't setting up its interrupts correctly so that
> the core knows that those interrupts are reserved, ideally the platform
> would just use domains for everything but at least irq_alloc_decs()
> needs to know what is going on.
Thanks I got this, however in this case should regmap handle such
condition where domain is unknown?
By the way, I was testing on smdkv6410 where Dialog device is not a
component of the board.


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