Documentation/sh/clk.txt

   1 Clock framework on SuperH architecture
   2
   3 The framework on SH extends existing API by the function clk_set_rate_ex,
   4 which prototype is as follows:
   5
   6     clk_set_rate_ex (struct clk *clk, unsigned long rate, int algo_id)
   7
   8 The algo_id parameter is used to specify algorithm used to recalculate clocks,
   9 adjanced to clock, specified as first argument. It is assumed that algo_id==0
  10 means no changes to adjanced clock
  11
  12 Internally, the clk_set_rate_ex forwards request to clk->ops->set_rate method,
  13 if it is present in ops structure. The method should set the clock rate and adjust
  14 all needed clocks according to the passed algo_id.
  15 Exact values for algo_id are machine-dependent. For the sh7722, the following
  16 values are defined:
  17
  18         NO_CHANGE       = 0,
  19         IUS_N1_N1,      /* I:U = N:1, U:Sh = N:1 */
  20         IUS_322,        /* I:U:Sh = 3:2:2        */
  21         IUS_522,        /* I:U:Sh = 5:2:2        */
  22         IUS_N11,        /* I:U:Sh = N:1:1        */
  23         SB_N1,          /* Sh:B = N:1            */
  24         SB3_N1,         /* Sh:B3 = N:1           */
  25         SB3_32,         /* Sh:B3 = 3:2           */
  26         SB3_43,         /* Sh:B3 = 4:3           */
  27         SB3_54,         /* Sh:B3 = 5:4           */
  28         BP_N1,          /* B:P   = N:1           */
  29         IP_N1           /* I:P   = N:1           */
  30
  31 Each of these constants means relation between clocks that can be set via the FRQCR
  32 register