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The RK817 & RK809 chip is a power management IC for multimedia and handheld devices. It contains the following components: - Regulators - RTC - Clkout - Pinctrl - Powerkey The RK817 & RK809 core driver is registered as a platform driver and provides communication through I2C with the host device for the different components. The following is the different between the RK817 and the RK809. 1、The dcdc-buck5 is a boost dcdc for RK817 and is a buck for RK809. 2、The RK817 have one switch but The Rk809 have two. 3、The RK817 have a charger and powerpatch function but RK809 not. Change-Id: I132029c5b28978db7ae06e13c327a1edf70f5b69 Signed-off-by: Tony Xie <tony.xie@rock-chips.com>