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

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Message-ID: <51FBD1CA.1000202@ahsoftware.de>
Date:	Fri, 02 Aug 2013 17:35:38 +0200
From:	Alexander Holler <holler@...oftware.de>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
CC:	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

Am 02.08.2013 11:57, schrieb Alexander Holler:

> There must have been a bug in the patch too. I've also added that
> iinterrupt-parent stuff (with the same flags as used by the driver) and
> just have let the driver call
> 
> request_threaded_irq(gpio_to_irq(gpio), flags);
> 
> without the gpio_request()/input() before. And request_threaded_irq()

Not to forget that it would/will be a big problem, if you will forbid
drivers to use gpio_request() when they use the gpio as irq (as it
was/is necessary now).

With my kernel 3.10.4 with some patches on top, I see
# git grep gpio_to_irq | wc -l
678

So there are a lot of places where

gpio_request();
gpio_direction_input()
request_irq();

would have been changed to

#ifdef CONFIG_OF_GPIO
gpio_request();
gpio_direction_input()
#endif
request_irq();

to not fail during runtime (hopefully with some descriptive error
message if it fails).

Regards,

Alexander Holler

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