diff options
Diffstat (limited to 'drivers/clk/clk-fractional-divider.c')
| -rw-r--r-- | drivers/clk/clk-fractional-divider.c | 28 |
1 files changed, 20 insertions, 8 deletions
diff --git a/drivers/clk/clk-fractional-divider.c b/drivers/clk/clk-fractional-divider.c index aab904618eb6..fdf625fb10fa 100644 --- a/drivers/clk/clk-fractional-divider.c +++ b/drivers/clk/clk-fractional-divider.c @@ -49,16 +49,12 @@ static unsigned long clk_fd_recalc_rate(struct clk_hw *hw, return ret; } -static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate, - unsigned long *parent_rate) +static void clk_fd_general_approximation(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate, + unsigned long *m, unsigned long *n) { struct clk_fractional_divider *fd = to_clk_fd(hw); unsigned long scale; - unsigned long m, n; - u64 ret; - - if (!rate || rate >= *parent_rate) - return *parent_rate; /* * Get rate closer to *parent_rate to guarantee there is no overflow @@ -71,7 +67,23 @@ static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate, rational_best_approximation(rate, *parent_rate, GENMASK(fd->mwidth - 1, 0), GENMASK(fd->nwidth - 1, 0), - &m, &n); + m, n); +} + +static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + struct clk_fractional_divider *fd = to_clk_fd(hw); + unsigned long m, n; + u64 ret; + + if (!rate || rate >= *parent_rate) + return *parent_rate; + + if (fd->approximation) + fd->approximation(hw, rate, parent_rate, &m, &n); + else + clk_fd_general_approximation(hw, rate, parent_rate, &m, &n); ret = (u64)*parent_rate * m; do_div(ret, n); |