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

[Stefan Herbrechtsmeier]

Hi,

Am 28.12.2016 um 12:01 schrieb 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>
This is an incorrect use of the max-frequency property.

The max-frequency value limit the output clock of the mmc interface and 
depends on the controller, circuit (level shifter), board and so on. It 
doesn't represents the clock frequency of the controller.

The clock setup inside the clock framework should use the 
assigned-clock-rates property. The mmc driver should only enable the 
clock and pass the clock rate together with the max-frequency to the mmc 
framework.

Regards,
   Stefan