PMD clock is implemented for a single register field.
Output rate = parent_rate * (denominator - scale) / denominator
with
- denominator = bitmask of register field + 1
- scale = values of register field
For example, for bitmask is 0x7, denominator will be 8 and scale
will be computed and programmed accordingly.
Signed-off-by: Hoan Tran <hotran@apm.com> Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>