clk: sunxi-ng: Add MP_MMC clocks that support MMC timing modes switching

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All of our MMC clocks are of the MP clock type. A few MMC clocks on some
SoCs, such as MMC2 on the A83T, support new/old timing mode switching.

>From a clock rate point of view, when the new timing mode is active. the
output clock rate is halved.

This patch adds a special wrapper class of clocks, MP_MMC, around the
generic MP type clocks. The rate related callbacks in ccu_mp_mmc_ops
for this class look at the timing mode bit and apply the /2 post-divider
when needed, before passing it through to the generic class ops,
ccu_mp_ops.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

...

This commit is contained in:

Chen-Yu Tsai 2017-07-24 21:58:57 +08:00 • committed by Ulf Hansson

parent f6f64ed868

commit dc8797e39f

2 changed files with 110 additions and 0 deletions

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80

drivers/clk/sunxi-ng/ccu_mp.c

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30

drivers/clk/sunxi-ng/ccu_mp.h

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