linux-kernel - RE: GPIO support for HTC Dream

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Date:	Fri, 11 Dec 2009 18:50:25 -0500
From:	"H Hartley Sweeten" <hartleys@...ionengravers.com>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>,
	"Pavel Machek" <pavel@....cz>
Cc:	"Daniel Walker" <dwalker@...eaurora.org>,
	"Iliyan Malchev" <malchev@...gle.com>,
	"Brian Swetland" <swetland@...gle.com>,
	"kernel list" <linux-kernel@...r.kernel.org>,
	"Ryan Mallon" <ryan@...ewatersys.com>,
	"Arve Hj?nnev?g" <arve@...roid.com>,
	"linux-arm-kernel" <linux-arm-kernel@...ts.infradead.org>
Subject: RE: GPIO support for HTC Dream

On Friday, December 11, 2009 4:29 PM, Russell King wrote:
> On Fri, Dec 11, 2009 at 11:10:15PM +0100, Pavel Machek wrote:
>> +#include <linux/gpio.h>
> ...
>> +#include <mach/gpio.h>
> ...
>> +#include <asm/gpio.h>
>
> Emm, this is getting really silly.
> 
> include/linux/gpio.h:
>   
>   #ifdef CONFIG_GENERIC_GPIO
>   #include <asm/gpio.h>
>   #else
>   ...
>   #endif
> 
> arch/arm/include/asm/gpio.h:
> 
>   #include <mach/gpio.h>
> 
> There really is no point in including mach/gpio.h nor asm/gpio.h when
> linux/gpio.h will do.  I'm retiscent to add #warnings or #errors into
> these files, but it seems that this is such a common thing that it may
> be beneficial to do so.

Hi Russell,

I think you mentioned last year around this time, when the big header
move occurred, that you were going to add a guideline for mach/*.h
headers to Documentation/arm.  Maybe it's time to add that patch and
just note that the <linux/*.h> version of the common headers should
be used and that the <asm/*.h> and <mach/*.h> header gets pulled in
automatically.

I think the two big ones that everyone screws up are, <linux/gpio.h>
and <linux/io.h>.

Regards,
Hartley
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