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Since a new CCM with clock root slice is introduced in mx7. Provide
several APIs for configuring root slice in clock_slice.c
Implement clock/PLL relevant functions for modules in mx7d to
enable/disable/set/get clocks or PLLs.
From mx7d, the clocks are initialized in function "void clock_init(void)",
such as UART, USDHC, ECSPI, USB, WDOG, WEIM. These module don't have clock
setting functions in driver and BSP, and assume the clock is setup before
entering into u-boot. Because default root clock is 24Mhz OSC, we have
to setup these default clocks.
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Signed-off-by: Ye.Li <B37916@freescale.com>
(cherry picked from commit 73b511503aef9675e58baadc0639d59c8395bcb4)
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