Man page 9 : clk_get

clk_get - lookup and obtain a reference to a clock producer.

struct clk * clk_get(struct device *  dev , const char *  id );

dev
    device for clock « consumer »

id
    clock consumer ID

Returns a struct clk corresponding to the clock producer, or valid IS_ERR condition containing errno. The implementation uses dev and id to determine the clock consumer, and thereby the clock producer. (IOW, id may be identical strings, but clk_get may return different clock producers depending on dev.)

Drivers must assume that the clock source is not enabled.

clk_get should not be called from within interrupt context.