mfd: rk808: Add support for power off on RK817

RK817 has a power-off bit in SYS_CFG3. Add support for powering
off the PMIC.
Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/rk808.c

@@ -543,6 +543,10 @@ static void rk808_pm_power_off(void)
 		reg = RK808_DEVCTRL_REG,
 		bit = DEV_OFF_RST;
 		break;
+	case RK817_ID:
+		reg = RK817_SYS_CFG(3);
+		bit = DEV_OFF;
+		break;
 	case RK818_ID:
 		reg = RK818_DEVCTRL_REG;
 		bit = DEV_OFF;