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

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Date:	Thu, 03 May 2012 16:28:59 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.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 05/03/2012 04:20 PM, Mark Brown wrote:
> On Thu, May 03, 2012 at 03:54:24PM +0300, Peter Ujfalusi wrote:
> 
>>  	/* In order to operate correctly we need valid interrupt config */
>> -	if (!client->irq || !pdata->irq_base) {
>> +	if (!client->irq) {
> 
> It looks like you're totally removing the use of irq_base which will
> break any boards that didn't convert to DT.  The usual idiom is to use
> irq_base as the base for the range of requested IRQs if it's supplied,
> otherwise set it to -1 to allow dynamic allocation.  This should keep
> existing users working without disruption.

In the current board files the pdata->irq_base set to some #defined
value (which is a comfortably big number).
With irq_alloc_descs(-1, 0, nr_irqs, 0); the range which can accommodate
the number of IRQs twl6040 will be provided so there is no need to me to
use the board specified irq_base.
The irq_base will be removed from the pdata structure, but that change
will go via linux-omap to avoid compile breakage.
This part is in preparation for DT, yes, but it is working without DT.
The twl6040 irq range is mapped to different numbers, that's all.

-- 
Péter
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