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Ranjani Vaidyanathan authored
Add support for scaling the bus frequency (both DDR and ahb_clk). The DDR and AHB_CLK are dropped to 24MHz when all devices that need high AHB frequency are disabled and the CORE frequency is at the lowest setpoint. The DDR is dropped to 400MHz for the video playback usecase. In this mode the GPU, FEC, SATA etc are disabled. To scale the bus frequency, its necessary that all cores except the core that is executing the DDR frequency change are in WFE. This is achieved by generating interrupts on un-used interrupts (Int no 139, 144, 145 and 146). Signed-off-by: Ranjani Vaidyanathan <ra5478@freescale.com>
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