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From: Lars-Peter Clausen <lars@metafoo.de>
To: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Cc: linux-kernel@vger.kernel.org,
	"'Grant Likely'" <grant.likely@secretlab.ca>,
	toshiharu-linux@dsn.okisemi.com
Subject: Re: Question: GPIO driver how to get irq_base
Date: Thu, 21 Apr 2011 10:09:14 +0200	[thread overview]
Message-ID: <4DAFE62A.105@metafoo.de> (raw)
In-Reply-To: <F9B588C24C5F470494D57D4EFFB14C6B@hacdom.okisemi.com>

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

  reply	other threads:[~2011-04-21  8:08 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-21  7:32 Question: GPIO driver how to get irq_base Tomoya MORINAGA
2011-04-21  8:09 ` Lars-Peter Clausen [this message]
2011-04-21 13:45   ` Grant Likely
2011-04-21 14:08     ` Lars-Peter Clausen
2011-04-21 14:24       ` Grant Likely
2011-04-22  0:33         ` Tomoya MORINAGA
2011-04-22  1:12         ` Tomoya MORINAGA
2011-04-23 10:14           ` Lars-Peter Clausen
2011-04-25  4:04             ` Tomoya MORINAGA
2011-05-10  5:54               ` Tomoya MORINAGA
2011-05-11 19:20                 ` Lars-Peter Clausen
2011-05-12 12:01                   ` Tomoya MORINAGA
2011-05-12 19:43                     ` Lars-Peter Clausen
2011-05-13  2:40                       ` Tomoya MORINAGA
2011-05-13  3:18                         ` Lars-Peter Clausen
2011-05-13  5:42                           ` Tomoya MORINAGA
2011-05-16 10:38                           ` Tomoya MORINAGA
2011-05-17  2:06                             ` Tomoya MORINAGA

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