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Provide a helper function to determine optimum numerator denominator value pairs taking into account restricted register size. Useful especially with PLL and other clock configurations. Signed-off-by: Oskar Schirmer <os@emlix.com> Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
20 lines
597 B
C
20 lines
597 B
C
/*
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* rational fractions
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*
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* Copyright (C) 2009 emlix GmbH, Oskar Schirmer <os@emlix.com>
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*
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* helper functions when coping with rational numbers,
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* e.g. when calculating optimum numerator/denominator pairs for
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* pll configuration taking into account restricted register size
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*/
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#ifndef _LINUX_RATIONAL_H
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#define _LINUX_RATIONAL_H
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void rational_best_approximation(
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unsigned long given_numerator, unsigned long given_denominator,
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unsigned long max_numerator, unsigned long max_denominator,
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unsigned long *best_numerator, unsigned long *best_denominator);
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#endif /* _LINUX_RATIONAL_H */
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