How to set SD clock in I.MX6

[bpmmaster]

Hi,

   Because some SDIO devices clock are  below 50MHz , Not as IMX51/53,  we can set the Max SD clock in board file.

In I.MX6 , there is no Max. Clock setting for SDIO.

   please help.

[igorpadykov]

Yes, correct for i.MX6  there is no max. clock settings because

every ARM sub-arch has a different, incompatible struct clk implementation.

Seems you can add such max. restriction in function  _clk_usdhc_round_rate

(clock.c  file).

More about Linux clock architecture one can find on eLinux.org:

"Common clock framework: how to use it" - eLinux.org

[bpmmaster]

thanks