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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2010-11-02 11:27:24 +0000
committerPaul Mundt <lethal@linux-sh.org>2010-11-08 09:35:26 +0900
commit6af26c6c99f01e810f9944543df810e320284aa3 (patch)
tree9eaca6f86d322b700484e13cd4ebb0b3f6fc0c97 /include
parent5aefa34fada9d17a00635516688de34702451708 (diff)
sh: add clk_round_parent() to optimize parent clock rate
Sometimes it is possible and reasonable to adjust the parent clock rate to improve precision of the child clock, e.g., if the child clock has no siblings. clk_round_parent() is a new addition to the SH clock-framework API, that implements such an optimization for child clocks with divisors, taking all integer values in a range. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/sh_clk.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sh_clk.h b/include/linux/sh_clk.h
index 4dca992f3093..cea0c38e7a63 100644
--- a/include/linux/sh_clk.h
+++ b/include/linux/sh_clk.h
@@ -122,6 +122,10 @@ int clk_rate_table_find(struct clk *clk,
long clk_rate_div_range_round(struct clk *clk, unsigned int div_min,
unsigned int div_max, unsigned long rate);
+long clk_round_parent(struct clk *clk, unsigned long target,
+ unsigned long *best_freq, unsigned long *parent_freq,
+ unsigned int div_min, unsigned int div_max);
+
#define SH_CLK_MSTP32(_parent, _enable_reg, _enable_bit, _flags) \
{ \
.parent = _parent, \