From: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Date: Sat, 21 Feb 2015 10:40:24 +0000 (+0100)
Subject: clk: divider: fix selection of divider when rounding to closest
X-Git-Tag: omap-for-v4.1/wl12xx-dt~8^2~6
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=26bac95aa88c2b1747808c0b885abe7814c0165d;p=pandora-kernel.git

clk: divider: fix selection of divider when rounding to closest

It's an invalid approach to assume that among two divider values
the one nearer the exact divider is the better one.

Assume a parent rate of 1000 Hz, a divider with CLK_DIVIDER_POWER_OF_TWO
and a target rate of 89 Hz. The exact divider is ~ 11.236 so 8 and 16
are the candidates to choose from yielding rates 125 Hz and 62.5 Hz
respectivly. While 8 is nearer to 11.236 than 16 is, the latter is still
the better divider as 62.5 is nearer to 89 than 125 is.

Fixes: 774b514390b1 (clk: divider: Add round to closest divider)
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>
---

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