mfd: max8907: Add power off control

Add DT property "maxim,system-power-controller" to indicate whether the
PMIC is in charge of controlling the system power. If this is set, the
driver will provide the pm_power_off() function.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

include/linux/mfd/max8907.h

@@ -167,6 +167,7 @@
 #define MAX8907_MASK_OUT5V_VINEN	0x10
 #define MAX8907_MASK_OUT5V_ENSRC	0x0E
 #define MAX8907_MASK_OUT5V_EN		0x01
+#define MAX8907_MASK_POWER_OFF		0x40
 
 /* Regulator IDs */
 #define MAX8907_MBATT	0
@@ -231,6 +232,7 @@ enum {
 
 struct max8907_platform_data {
 	struct regulator_init_data *init_data[MAX8907_NUM_REGULATORS];
+	bool pm_off;
 };
 
 struct regmap_irq_chips_data;