linux-kernel - Re: [PATCH] RFC: interrupt consistency check for OF GPIO IRQs

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Message-ID: <52301C13.2030103@ahsoftware.de>
Date:	Wed, 11 Sep 2013 09:30:27 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	joelf@...com
CC:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux-OMAP <linux-omap@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Enric Balletbo i Serra <eballetbo@...il.com>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Kevin Hilman <khilman@...aro.org>,
	Balaji T K <balajitk@...com>,
	Tony Lindgren <tony@...mide.com>,
	Jon Hunter <jgchunter@...il.com>
Subject: Re: [PATCH] RFC: interrupt consistency check for OF GPIO IRQs

And another small update. ;)

Am 11.09.2013 09:16, schrieb Alexander Holler:

>> To summarize what happens if a driver uses a gpio as irq:
>>
>> gpio_request() // This works only if the gpio was not requested before
>> gpio_direction_input()
>> gpio_to_irq() // This needs an irq-mapping
>> request_threaded_irq()
>>
>> So I would suggest multiple steps to change that:
>>
>> 1. Create a mapping for every gpio found in DT (or all gpios if no DT is
>> used). I think that is what Linus patch does (sorry, I haven't really
>> followed this thread and didn't look in deep at the patch).
>>
>> 2. Implement gpio_request_for_irq()
>> This would just be a small macro for gpio_request();
>> gpio_direction_input()
>>

I would add gpio_to_irq() to that macro, so that it returns the irq 
number or zero if something failed.

Regards,

Alexander Holler

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