clk: sunxi-ng: nm: Add support for sigma-delta modulation

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Some of the N-M-style clocks, namely the PLLs, support sigma-delta
modulation to do fractional-N frequency synthesis. This is used in
the audio PLL to generate the exact frequency the audio blocks need.
These frequencies can not be generated with integer N-M factors.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

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Chen-Yu Tsai 2017-10-12 16:37:00 +08:00 • committed by Maxime Ripard

parent 05d2eaac96

commit 392ba5fafc

2 changed files with 46 additions and 1 deletions

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22

drivers/clk/sunxi-ng/ccu_nm.c

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25

drivers/clk/sunxi-ng/ccu_nm.h

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