[U-Boot] [PATCH 2/4] MMC: EXYNOS: Added call back function for clock get

[Jaehoon Chung <jh80.chung@samsung.com>]

On 12/05/2012 10:31 PM, Amar wrote:
> This patch defines the call back required by dw mmc driver to get the
> clock value. It also adds function to set the dw mmc clock divider ratio.
> 
> Signed-off-by: Amarendra Reddy <amarendra.xt@samsung.com>
> ---
>  drivers/mmc/exynos_dw_mmc.c |   14 +++++++++++++-
>  1 files changed, 13 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/mmc/exynos_dw_mmc.c b/drivers/mmc/exynos_dw_mmc.c
> index 72a31b7..7cc8aba 100644
> --- a/drivers/mmc/exynos_dw_mmc.c
> +++ b/drivers/mmc/exynos_dw_mmc.c
> @@ -30,25 +30,37 @@ static void exynos_dwmci_clksel(struct dwmci_host *host)
>  {
>  	u32 val;
>  	val = DWMCI_SET_SAMPLE_CLK(DWMCI_SHIFT_0) |
> -		DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) | DWMCI_SET_DIV_RATIO(0);
> +		DWMCI_SET_DRV_CLK(DWMCI_SHIFT_0) |
> +		DWMCI_SET_DIV_RATIO(DWMCI_SHIFT_0);
>  
>  	dwmci_writel(host, DWMCI_CLKSEL, val);
>  }
>  
> +unsigned int exynos_dwmci_get_clk(int dev_index)
> +{
> +	return get_mmc_clk(dev_index);
> +}
> +
>  int exynos_dwmci_init(u32 regbase, int bus_width, int index)
>  {
>  	struct dwmci_host *host = NULL;
> +	int div = 0;
Why didn't initialize to 1? div is assigned to 1 at the below.
>  	host = malloc(sizeof(struct dwmci_host));
>  	if (!host) {
>  		printf("dwmci_host malloc fail!\n");
>  		return 1;
>  	}
>  
> +	div = 1;
> +	/* Set the mmc clock divider ratio & pre-ratio */
> +	set_mmc_clk(index, div);
Then if div set to 1, what value is set?
Can this code adjust to every board?
> +
>  	host->name = EXYNOS_NAME;
>  	host->ioaddr = (void *)regbase;
>  	host->buswidth = bus_width;
>  	host->clksel = exynos_dwmci_clksel;
>  	host->dev_index = index;
> +	host->mmc_clk = exynos_dwmci_get_clk;
>  
>  	add_dwmci(host, 52000000, 400000);
>  
>