diff options
| author | Dzmitry Sankouski <dsankouski@gmail.com> | 2024-11-18 13:15:19 +0300 |
|---|---|---|
| committer | Bjorn Andersson <andersson@kernel.org> | 2025-01-07 11:16:00 -0600 |
| commit | cef0523dd2ff65cc95cb747a348ce018f22f4d95 (patch) | |
| tree | e925bd5e4d73af5071ca3159183d075733c126f5 /drivers/clk/qcom/clk-rcg2.c | |
| parent | d26c4ad3fa53e76a602a9974ade171c8399f2a29 (diff) | |
clk: qcom: clk-rcg2: document calc_rate function
Update calc_rate docs to reflect, that pre_div
is not pure divisor, but a register value, and requires conversion.
Signed-off-by: Dzmitry Sankouski <dsankouski@gmail.com>
Link: https://lore.kernel.org/r/20241118-starqltechn_integration_upstream-v8-1-ac8e36a3aa65@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Diffstat (limited to 'drivers/clk/qcom/clk-rcg2.c')
| -rw-r--r-- | drivers/clk/qcom/clk-rcg2.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c index bf6406f5279a..4da70be280ce 100644 --- a/drivers/clk/qcom/clk-rcg2.c +++ b/drivers/clk/qcom/clk-rcg2.c @@ -148,12 +148,21 @@ static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index) return update_config(rcg); } -/* - * Calculate m/n:d rate +/** + * calc_rate() - Calculate rate based on m/n:d values + * + * @rate: Parent rate. + * @m: Multiplier. + * @n: Divisor. + * @mode: Use zero to ignore m/n calculation. + * @hid_div: Pre divisor register value. Pre divisor value + * relates to hid_div as pre_div = (hid_div + 1) / 2. + * + * Return calculated rate according to formula: * * parent_rate m * rate = ----------- x --- - * hid_div n + * pre_div n */ static unsigned long calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div) |