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Simple Power-Managed bus controller may need functional clock(s) to be enabled before child devices connected to the bus can be accessed. Get the clock(s) as a bulk and enable/disable the clock(s) when the bus is being power managed. One example is that Freescale i.MX8qxp pixel link MSI bus controller needs MSI clock and AHB clock to be enabled before accessing child devices. Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Liu Ying <victor.liu@nxp.com> Link: https://lore.kernel.org/r/20221017074039.4181843-2-victor.liu@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>