clk: lpc18xx-ccu: fix potential system hang when disabling unused clocks
CCU branch clock register must only be accessed while the base (parent) clock is running. Access with a disabled base clock will cause the system to hang. Fix this issue by adding code that check if the parent clock is running in the is_enabled clk_ops callback. This hang would occur when disabling unused clocks after AMBA runtime pm had already disabled some of the clocks. Signed-off-by: NJoachim Eastwood <manabian@gmail.com> Signed-off-by: NStephen Boyd <sboyd@codeaurora.org>
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