struct_clk_notifier_data (9)

struct clk_notifier_data {
  struct clk * clk;
  unsigned long old_rate;
  unsigned long new_rate;
};

clk

struct clk * being changed

old_rate

previous rate of this clk

new_rate

new rate of this clk

For a pre-notifier, old_rate is the clk's rate before this rate change, and new_rate is what the rate will be in the future. For a post-notifier, old_rate and new_rate are both set to the clk's current rate (this was done to optimize the implementation).