linux-kernel - Re: [PATCH 2/3] MFD: twl6040: Allocate IRQ numbers dynamically

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Message-ID: <20120504090856.GA14230@opensource.wolfsonmicro.com>
Date:	Fri, 4 May 2012 10:08:56 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>, linux-kernel@...r.kernel.org,
	Misael Lopez Cruz <misael.lopez@...com>,
	Benoit Cousson <b-cousson@...com>,
	devicetree-discuss@...ts.ozlabs.org, Liam Girdwood <lrg@...com>
Subject: Re: [PATCH 2/3] MFD: twl6040: Allocate IRQ numbers dynamically

On Fri, May 04, 2012 at 11:38:34AM +0300, Peter Ujfalusi wrote:

> The irq_base was used to map the nested interrupt numbers somewhere high
> enough. twl6040 has one irq line towards the CPU (comes via
> i2c_client->irq).
> With this change we just change the mapping of the nested interrupt
> range provided by twl6040 (instead of hardwired number we ask for
> suitable range).

You're not understanding the issue at all - the issue is that if
some driver outside the twl6040 driver is using an interrupt in that
range based off the irq_base that they supplied then you'll break them.
The most common case here is using GPIOs on the device as interrupts.

If this is safe you should at least be making it clear why...

> We have sdp4430 and PandaBoard with twl6040. They are fine. The other
> non upstream boards should be fine as well with this change.

...ideally in a more concrete way than just saying it works on your
reference boards.

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