davinci: enable easy top down traversal of clock tree
Achieve easy top down traversal of clock tree by keeping track of each clock's list of children. This is useful in supporting DVFS where clock rates of all children need to be updated in an efficient manner. Signed-off-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
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