linux-kernel - Re: Question: GPIO driver how to get irq

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Message-ID: <4DAFE62A.105@metafoo.de>
Date:	Thu, 21 Apr 2011 10:09:14 +0200
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Tomoya MORINAGA <tomoya-linux@....okisemi.com>
CC:	linux-kernel@...r.kernel.org,
	'Grant Likely' <grant.likely@...retlab.ca>,
	toshiharu-linux@....okisemi.com
Subject: Re: Question: GPIO driver how to get irq_base

On 04/21/2011 09:32 AM, Tomoya MORINAGA wrote:
> Hi GPIO maintainer,
> 
> Need your help.
> I want to add interrupt function to gpio/pch_gpio.c
> 
> According to other upstreamed GPIO driver, (e.g. pl061, langwell, etc...)
> 2 IRQs(irq, irq_base) are used.
> 
> I can get "irq" from (struct pci_dev *)pdev->irq.
> However I can't understand where can I get the "irq_base".
> Let me know how to get.
> 
> Thanks,
> -----------------------------------------
> Tomoya MORINAGA
> OKI SEMICONDUCTOR CO., LTD.

In my opinion the best option for expander chips is to allocate a new irq_desc
range by calling irq_alloc_descs. It will return the first irq number in the
newly allocated range, which will be your irq_base.
But be aware that this will require SPARSE_IRQ to work.

- Lars
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