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All CMUs are powered up initially. This uses needless power. This patch makes sure all CMUs are powered down by default. This involves configuring a number reference clock and power-down registers of the CMU. Individual CMUs are later powered up, when the serdes lanes are configured. Signed-off-by: Daniel Machon <daniel.machon@microchip.com> Link: https://lore.kernel.org/r/20230417180335.2787494-5-daniel.machon@microchip.com Signed-off-by: Vinod Koul <vkoul@kernel.org>