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

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Date:	Wed, 28 Oct 2009 08:35:48 +0800
From:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
To:	Andrew Victor <avictor.za@...il.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>, kernel@...32linux.org,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/3 v2] at91/atmel-mci: inclusion of sd/mmc driver in 
 at91sam9g45 chip and board

Andrew Victor <avictor.za@...il.com> wrote:
> > +static struct mci_platform_data __initdata mci0_data = {
> > +       .slot[0] = {
> > +               .bus_width      = 4,
> > +               .detect_pin     = AT91_PIN_PD10,
> > +               .wp_pin         = -1,
> > +       },  
> 
> Causes at91_set_gpio_input() to be called for pin -1.  Which shouldn't be valid.
> AT91 platforms use 0 to indicate an un-connected GPIO pin, so the
> assignment of "wp_pin" should probably just be removed.

The mci driver expects non-existent pins to have a negative value, as
do all other drivers which use gpio_is_valid().

Haavard
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