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 21:53:03 +0200
From:	Andrew Victor <avictor.za@...il.com>
To:	Thiago A. Corrêa <thiago.correa@...il.com>
Cc:	Haavard Skinnemoen <haavard.skinnemoen@...el.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

hi,

> 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 :)

What magic numbers ?

If you have a "wp_pin" on the board, you declare the struct as:
    static struct mci_platform_data __initdata mci0_data = {
          .slot[0] = {
                 .bus_width      = 4,
                 .detect_pin     = AT91_PIN_PD10,
        }
    }

and if you do have a "wp_pin" on your board, you declare the struct as:
    static struct mci_platform_data __initdata mci0_data = {
          .slot[0] = {
                 .bus_width      = 4,
                 .detect_pin     = AT91_PIN_PD10,
                 .wp_pin          = AT91_PIN_PD11,
        }
    }

And it's more future-proof.  If the next version of the
driver/peripheral has a "toggle_pin" GPIO option, you don't need to go
update all board files with a ".toggle_pin  = GPIO_PIN_NONE"   or
".toggle_pin = -ENODEV".


Regards,
  Andrew Victor
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