clk: Fixup errorhandling for clk_set_parent

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Fixup the broken feature of allowing reparent of a clk to the
orhpan list and vice verse. When operating on a single-parent
clk, the .set_parent callback for the clk hw is optional to
implement, but for a multi-parent clk it is mandatory.

Moreover improve the errorhandling by verifying the prerequisites
before triggering clk notifiers. This will prevent unnecessary
rollback with ABORT_RATE_CHANGE.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Rajagopal Venkat <rajagopal.venkat@linaro.org>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

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Ulf Hansson 2013-04-02 23:09:38 +02:00 • committed by Mike Turquette

parent b33d212f49

commit 031dcc9bd4

1 changed files with 36 additions and 20 deletions

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drivers/clk/clk.c

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