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