linux-kernel - Re: [PATCH 3/3 v2] at91/atmel-mci: inclusion of sd/mmc driver in at91sam9g45 chip and board

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Message-Id: <1257200097.4358.54.camel@ben-desktop>
Date:	Tue, 03 Nov 2009 09:14:57 +1100
From:	Ben Nizette <bn@...sdigital.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>
Cc:	Andrew Victor <avictor.za@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	"\"\\\"Thiago A.\\\"" Corrêa" 
	<thiago.correa@...il.com>, kernel@...32linux.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 3/3 v2] at91/atmel-mci: inclusion of sd/mmc driver in
 at91sam9g45 chip and board


[apologies for the MTA fart causing that weird, rouge blank email :-) ]

On Mon, 2009-11-02 at 18:11 +0100, Nicolas Ferre wrote:
> Ben Nizette :
> > 
> > static inline int gpio_is_valid(int number)
> > {
> > 	/* only some non-negative numbers are valid */
> > 	return ((unsigned)number) < ARCH_NR_GPIOS;
> > }
> 
> I understand that the better way to solve this issue is to:
> - keep the AT91 way of specifying not connected pins (= 0)
> - code the gpio_is_valid() function for at91 that tests this way of
> handling not connected gpio
> 

I'm not sure I'd break cross-arch compat here, but whatever.  I guess it
depends how deeply the =0 stuff is ingrained in the at91 codebase

> I see that in arch/arm/mach-at91/include/mach/gpio.h
> we include the asm-generic/gpio.h file... must I implement the full set
> of gpiolib ?

I'd suggest creating an ARCH_HAVE_GPIO_VALID (darn, long name) or
something; define it before #include <asm-generic/gpio.h> and #ifdef
protect the offending declaration in that header.

	--Ben.

> 
> Best regards,

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