pch_uart: reference clock on CM-iTC
Default clock source for UARTs on Topcliff is external UART_CLK. On CM-iTC USB_48MHz is used instead. After VCO2PLL and DIV manipulations UARTs will receive 192 MHz. Clock manipulations on Topcliff are controlled in pch_phub.c v2: redone against the linux-next tree v3: redone against linux/kernel/git/next/linux-next.git snapshot Signed-off-by: NDenis Turischev <denis@compulab.co.il> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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