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>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/mfd/max8907.c b/drivers/mfd/max8907.c
index 6497c98e030d..2303641dd052 100644
--- a/drivers/mfd/max8907.c
+++ b/drivers/mfd/max8907.c
@@ -176,11 +176,26 @@ static const struct regmap_irq_chip max8907_rtc_irq_chip = {
         .num_irqs = ARRAY_SIZE(max8907_rtc_irqs),
 };
 
+struct max8907 *max8907_pm_off;
+static void max8907_power_off(void)
+{
+        regmap_update_bits(max8907_pm_off->regmap_gen, MAX8907_REG_RESET_CNFG,
+                        MAX8907_MASK_POWER_OFF, MAX8907_MASK_POWER_OFF);
+}
+
 static __devinit int max8907_i2c_probe(struct i2c_client *i2c,
                                        const struct i2c_device_id *id)
 {
         struct max8907 *max8907;
         int ret;
+        struct max8907_platform_data *pdata = dev_get_platdata(&i2c->dev);
+        bool pm_off = false;
+
+        if (pdata)
+                pm_off = pdata->pm_off;
+        else if (i2c->dev.of_node)
+                pm_off = of_property_read_bool(i2c->dev.of_node,
+                                        "maxim,system-power-controller");
 
         max8907 = devm_kzalloc(&i2c->dev, sizeof(struct max8907), GFP_KERNEL);
         if (!max8907) {
@@ -251,6 +266,11 @@ static __devinit int max8907_i2c_probe(struct i2c_client *i2c,
                 goto err_add_devices;
         }
 
+        if (pm_off && !pm_power_off) {
+                max8907_pm_off = max8907;
+                pm_power_off = max8907_power_off;
+        }
+
         return 0;
 
 err_add_devices: