Re: [PATCH] ARM: OMAP: hsmmc: add max_freq field

[Tony Lindgren <tony@atomide.com>]

* Daniel Mack <zonque@gmail.com> [111214 04:51]:
> External circuitry like level shifters may limit the maximum operation
> speed of the hsmmc controller. Add a field to struct omap2_hsmmc_info
> so boards can adjust the setting on demand.
> 
> Signed-off-by: Daniel Mack <zonque@gmail.com>
> Cc: Tony Lindgren <tony@atomide.com>

Acked-by: Tony Lindgren <tony@atomide.com>

> ---
>  arch/arm/mach-omap2/hsmmc.c   |    1 +
>  arch/arm/mach-omap2/hsmmc.h   |    2 ++
>  drivers/mmc/host/omap_hsmmc.c |    8 ++++++--
>  3 files changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/hsmmc.c b/arch/arm/mach-omap2/hsmmc.c
> index f4a1020..4c7bc36 100644
> --- a/arch/arm/mach-omap2/hsmmc.c
> +++ b/arch/arm/mach-omap2/hsmmc.c
> @@ -298,6 +298,7 @@ static int __init omap_hsmmc_pdata_init(struct omap2_hsmmc_info *c,
>  	mmc->slots[0].caps = c->caps;
>  	mmc->slots[0].internal_clock = !c->ext_clock;
>  	mmc->dma_mask = 0xffffffff;
> +	mmc->max_freq = c->max_freq;
>  	if (cpu_is_omap44xx())
>  		mmc->reg_offset = OMAP4_MMC_REG_OFFSET;
>  	else
> diff --git a/arch/arm/mach-omap2/hsmmc.h b/arch/arm/mach-omap2/hsmmc.h
> index f757e78..65a8c12 100644
> --- a/arch/arm/mach-omap2/hsmmc.h
> +++ b/arch/arm/mach-omap2/hsmmc.h
> @@ -25,6 +25,8 @@ struct omap2_hsmmc_info {
>  	char	*name;		/* or NULL for default */
>  	struct device *dev;	/* returned: pointer to mmc adapter */
>  	int	ocr_mask;	/* temporary HACK */
> +	int	max_freq;	/* maximum clock, if constrained by external
> +				 * circuitry, or 0 for default */
>  	/* Remux (pad configuration) when powering on/off */
>  	void (*remux)(struct device *dev, int slot, int power_on);
>  	/* init some special card */
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 101cd31..8215ef9 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -1927,8 +1927,12 @@ static int __init omap_hsmmc_probe(struct platform_device *pdev)
>  	if (mmc_slot(host).vcc_aux_disable_is_sleep)
>  		mmc_slot(host).no_off = 1;
>  
> -	mmc->f_min	= OMAP_MMC_MIN_CLOCK;
> -	mmc->f_max	= OMAP_MMC_MAX_CLOCK;
> +	mmc->f_min = OMAP_MMC_MIN_CLOCK;
> +
> +	if (pdata->max_freq > 0)
> +		mmc->f_max = pdata->max_freq;
> +	else
> +		mmc->f_max = OMAP_MMC_MAX_CLOCK;
>  
>  	spin_lock_init(&host->irq_lock);
>  
> -- 
> 1.7.7.4
>