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:	Tue, 27 Oct 2009 22:53:26 -0200
From:	Thiago A. Corrêa <thiago.correa@...il.com>
To:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Cc:	Andrew Victor <avictor.za@...il.com>, linux-mmc@...r.kernel.org,
	kernel@...32linux.org, linux-kernel@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	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

On Tue, Oct 27, 2009 at 10:35 PM, Haavard Skinnemoen
<haavard.skinnemoen@...el.com> wrote:
> 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().
>

Then I think it would be best to use GPIO_PIN_NONE. Makes it clear
what is expected and avoids confusion on what should be the proper
value.
I hope I'm not saying non-sense, but even if I am, I guess you can see
that I'm advocating against the magic numbers :)


Kind Regards,
   Thiago A. Correa
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