lib: rational: copy the rational fraction lib routines from Linux
Copy the best rational approximation calculation routines from Linux.
Typical usecase for these routines is to calculate the M/N divider
values for PLLs to reach a specific clock rate.
This is based on linux kernel commit:
"lib/math/rational.c: fix possible incorrect result from rational
fractions helper"
(sha1: 323dd2c3ed0641f49e89b4e420f9eef5d3d5a881)
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Tero Kristo <kristo@kernel.org>
diff --git a/lib/Makefile b/lib/Makefile
index b4795a6..881034f 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -73,6 +73,8 @@
obj-$(CONFIG_$(SPL_)LZMA) += lzma/
obj-$(CONFIG_$(SPL_)LZ4) += lz4_wrapper.o
+obj-$(CONFIG_$(SPL_)LIB_RATIONAL) += rational.o
+
obj-$(CONFIG_LIBAVB) += libavb/
obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += libfdt/