Re: [PATCH] ARM: mach-shmobile: mackerel: Add mmcif support

[Paul Mundt <lethal@linux-sh.org>]

On Wed, Dec 15, 2010 at 01:08:05PM +0900, Yusuke Goda wrote:
> @@ -723,6 +770,7 @@ static void __init mackerel_init(void)
>  	gpio_request(GPIO_FN_SDHID0_1, NULL);
>  	gpio_request(GPIO_FN_SDHID0_0, NULL);
> 
> +#if !defined(CONFIG_MMC_SH_MMCIF)
>  	/* enable SDHI1 */
>  	gpio_request(GPIO_FN_SDHICMD1, NULL);
>  	gpio_request(GPIO_FN_SDHICLK1, NULL);
> @@ -730,6 +778,7 @@ static void __init mackerel_init(void)
>  	gpio_request(GPIO_FN_SDHID1_2, NULL);
>  	gpio_request(GPIO_FN_SDHID1_1, NULL);
>  	gpio_request(GPIO_FN_SDHID1_0, NULL);
> +#endif
>  	/* card detect pin for MMC slot (CN7) */
>  	gpio_request(GPIO_PORT41, NULL);
>  	gpio_direction_input(GPIO_PORT41);
> @@ -742,6 +791,18 @@ static void __init mackerel_init(void)
>  	gpio_request(GPIO_FN_SDHID2_1, NULL);
>  	gpio_request(GPIO_FN_SDHID2_0, NULL);
> 
> +	/* MMCIF */
> +	gpio_request(GPIO_FN_MMCD0_0, NULL);
> +	gpio_request(GPIO_FN_MMCD0_1, NULL);
> +	gpio_request(GPIO_FN_MMCD0_2, NULL);
> +	gpio_request(GPIO_FN_MMCD0_3, NULL);
> +	gpio_request(GPIO_FN_MMCD0_4, NULL);
> +	gpio_request(GPIO_FN_MMCD0_5, NULL);
> +	gpio_request(GPIO_FN_MMCD0_6, NULL);
> +	gpio_request(GPIO_FN_MMCD0_7, NULL);
> +	gpio_request(GPIO_FN_MMCCMD0, NULL);
> +	gpio_request(GPIO_FN_MMCCLK0, NULL);
> +

So we can infer that MMCIF and SDHI1 are muxed on the same pins and we
need to select one or the other based on the configuration. Is there a
way to figure out which mode we are in based off of the card detect pin?
It would be nice to detect this at runtime instead of having to hardcode
the configuration.