ARM: imx: add standby mode support for suspend
Add standby mode support for suspend, to enter standby mode: echo standby > /sys/power/state; Use UART or RTC alarm to wake up system, when system enters standby mode, SOC will enter STOP mode with ARM core kept power on and 24M XTAL on. Signed-off-by: Anson Huang <b20788@freescale.com> Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
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