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Message-Id: <20241030-starqltechn_integration_upstream-v8-1-40f8d5e47062@gmail.com> Date: Wed, 30 Oct 2024 21:57:37 +0300 From: Dzmitry Sankouski <dsankouski@...il.com> To: Bjorn Andersson <andersson@...nel.org>, Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org> Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, Dzmitry Sankouski <dsankouski@...il.com> Subject: [PATCH v8 1/3] 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@...il.com> --- Changes in v8: - format kernel-doc - test with scripts/kernel-doc --- drivers/clk/qcom/clk-rcg2.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c index bf26c5448f00..b403e4d6dcdd 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) -- 2.39.2
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