linux-kernel - Re: [PATCH] regmap-irq: allow auto-allocated IRQs to be mapped

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Date:	Sat, 4 Aug 2012 11:54:24 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Anthony Olech <anthony.olech.opensource@...semi.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Anthony Olech <anthony.olech@...semi.com>,
	Dajun Chen <david.chen@...semi.com>
Subject: Re: [PATCH] regmap-irq: allow auto-allocated IRQs to be mapped

On Wed, Aug 01, 2012 at 07:05:15PM +0100, Anthony Olech wrote:

> if the irq_base is set to -1 when calling regmap_add_irq_chip()
> then allow the IRQ to be mapped even if the allocated irq_base
> is actually zero.

> This restores the behaviour seen in v3.4, and I assume that the
> tidy-ups just made in v3.5 INADVERTENTLY introduce this change
> in behaviour.

Please pay MORE attention to the changelog - obviously there's no
problem mapping automatically allocated IRQs, there's only any effect if
they happen to GET allocated at zero.

The only real issue I see with the current code is that if the user
explicitly wants to statically allocate an IRQ range at zero they can't.
The current intended behaviour is that we use a linear domain unless a
positive IRQ base is specified, though we're not quite doing that right
now as a transitional measure until drivers are updated.

The current da9052 driver usage seems to have quite a few problems, I do
recall having to fix some problems that make me doubt if it ever worked
well.  Looking at the code now I see it's using hard coded references to
absolute IRQ numbers which is an issue...  It should be being converted
to use regmap_irq_get_virq().
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