diff options
Diffstat (limited to 'drivers/clk/clk_test.c')
| -rw-r--r-- | drivers/clk/clk_test.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/clk/clk_test.c b/drivers/clk/clk_test.c index b3ed3b0e4c31..a154ec9d0111 100644 --- a/drivers/clk/clk_test.c +++ b/drivers/clk/clk_test.c @@ -104,6 +104,23 @@ static const struct clk_ops clk_dummy_minimize_rate_ops = { }; static const struct clk_ops clk_dummy_single_parent_ops = { + /* + * FIXME: Even though we should probably be able to use + * __clk_mux_determine_rate() here, if we use it and call + * clk_round_rate() or clk_set_rate() with a rate lower than + * what all the parents can provide, it will return -EINVAL. + * + * This is due to the fact that it has the undocumented + * behaviour to always pick up the closest rate higher than the + * requested rate. If we get something lower, it thus considers + * that it's not acceptable and will return an error. + * + * It's somewhat inconsistent and creates a weird threshold + * between rates above the parent rate which would be rounded to + * what the parent can provide, but rates below will simply + * return an error. + */ + .determine_rate = __clk_mux_determine_rate_closest, .set_parent = clk_dummy_single_set_parent, .get_parent = clk_dummy_single_get_parent, }; |