kernel-ark/drivers/clk
Viresh Kumar 270b9f421e SPEAr: clk: Add Fractional Synthesizer clock
All SPEAr SoC's contain Fractional Synthesizers. Their Fout is derived from
following equations:

Fout = Fin / (2 * div) (division factor)
div is 17 bits:-
     0-13 (fractional part)
     14-16 (integer part)
     div is (16-14 bits).(13-0 bits) (in binary)

     Fout = Fin/(2 * div)
     Fout = ((Fin / 10000)/(2 * div)) * 10000
     Fout = (2^14 * (Fin / 10000)/(2^14 * (2 * div))) * 10000
     Fout = (((Fin / 10000) << 14)/(2 * (div << 14))) * 10000

div << 14 is simply 17 bit value written at register.

This patch adds in support for this type of clock.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Reviewed-by: Mike Turquette <mturquette@linaro.org>
2012-05-12 21:19:27 +02:00
..
spear SPEAr: clk: Add Fractional Synthesizer clock 2012-05-12 21:19:27 +02:00
clk-divider.c clk: Use a separate struct for holding init data. 2012-05-01 18:13:20 -07:00
clk-fixed-factor.c clk: add a fixed factor clock 2012-05-08 14:13:25 -07:00
clk-fixed-rate.c clk: Use a separate struct for holding init data. 2012-05-01 18:13:20 -07:00
clk-gate.c clk: Use a separate struct for holding init data. 2012-05-01 18:13:20 -07:00
clk-mux.c clk: mux: assign init data 2012-05-08 14:13:07 -07:00
clk.c clk: remove COMMON_CLK_DISABLE_UNUSED 2012-05-08 14:12:42 -07:00
clkdev.c CLKDEV: provide helpers for common clock framework 2012-05-02 09:30:32 +01:00
Kconfig clk: remove COMMON_CLK_DISABLE_UNUSED 2012-05-08 14:12:42 -07:00
Makefile SPEAr: clk: Add VCO-PLL Synthesizer clock 2012-05-12 21:19:23 +02:00