clk: divider: fix calculation of initial best divider when rounding to closest
Similar to the reasoning for the previous commit DIV_ROUND_CLOSEST(parent_rate, rate) might not be the best integer divisor to get a good approximation for rate from parent_rate (given the metric for CLK_DIVIDER_ROUND_CLOSEST). For example assume a parent rate of 1000 Hz and a target rate of 700. Using DIV_ROUND_CLOSEST the suggested divisor gets calculated to 1 resulting in a target rate of 1000 with a delta of 300 to the desired rate. With choosing 2 as divisor however the resulting rate is 500 which is nearer to 700. Signed-off-by:Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Acked-by:
Sascha Hauer <s.hauer@pengutronix.de> Acked-by:
Maxime Coquelin <maxime.coquelin@st.com> Signed-off-by:
Michael Turquette <mturquette@linaro.org>
parent
26bac95a
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