[U-Boot] [RESEND PATCH v3 1/2] mmc: rockchip_sdhci: add clock init for mmc

[Jaehoon Chung]

On 12/28/2016 12:32 PM, Kever Yang wrote:
> Init the clock rate to max-frequency from dts with clock driver api.
> 
> Signed-off-by: Kever Yang <kever.yang at rock-chips.com>

Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>

Best Regards,
Jaehoon Chung

> ---
> 
> Changes in v3:
> - using dt for max-frequency
> Series-changes: 2
> - using the return value
> 
>  drivers/mmc/rockchip_sdhci.c | 19 +++++++++++++++++--
>  1 file changed, 17 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/rockchip_sdhci.c b/drivers/mmc/rockchip_sdhci.c
> index c56e1a3..e33e35e 100644
> --- a/drivers/mmc/rockchip_sdhci.c
> +++ b/drivers/mmc/rockchip_sdhci.c
> @@ -12,7 +12,9 @@
>  #include <libfdt.h>
>  #include <malloc.h>
>  #include <sdhci.h>
> +#include <clk.h>
>  
> +DECLARE_GLOBAL_DATA_PTR;
>  /* 400KHz is max freq for card ID etc. Use that as min */
>  #define EMMC_MIN_FREQ	400000
>  
> @@ -32,11 +34,24 @@ static int arasan_sdhci_probe(struct udevice *dev)
>  	struct rockchip_sdhc_plat *plat = dev_get_platdata(dev);
>  	struct rockchip_sdhc *prv = dev_get_priv(dev);
>  	struct sdhci_host *host = &prv->host;
> -	int ret;
> +	int max_frequency, ret;
> +	struct clk clk;
> +
> +
> +	max_frequency = fdtdec_get_int(gd->fdt_blob, dev->of_offset,
> +			"max-frequency", 0);
> +	ret = clk_get_by_index(dev, 0, &clk);
> +	if (!ret) {
> +		ret = clk_set_rate(&clk, max_frequency);
> +		if (IS_ERR_VALUE(ret))
> +			printf("%s clk set rate fail!\n", __func__);
> +	} else {
> +		printf("%s fail to get clk\n", __func__);
> +	}
>  
>  	host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD;
>  
> -	ret = sdhci_setup_cfg(&plat->cfg, host, CONFIG_ROCKCHIP_SDHCI_MAX_FREQ,
> +	ret = sdhci_setup_cfg(&plat->cfg, host, max_frequency,
>  			EMMC_MIN_FREQ);
>  
>  	host->mmc = &plat->mmc;
>