mfd: sec: Add PM ops and make it a wake up source

Add PM suspend/resume ops to the sec MFD core driver and make it a wake
up source. This allows proper waking from suspend to RAM and also fixes
broken interrupts after resuming:
[   42.705703] sec_pmic 7-0066: Failed to read IRQ status: -5

Interrupts stop working after first resume initiated by them (e.g. by
RTC Alarm interrupt) because interrupt registers were not cleared properly.

When device is woken up from suspend by RTC Alarm, an interrupt occurs
before resuming I2C bus controller. The interrupt is handled by
regmap_irq_thread which tries to read RTC registers. This read fails
(I2C is still suspended) and RTC Alarm interrupt is disabled.

Disable the S5M8767 interrupts during suspend (disable_irq()) and enable
them during resume so the device will be still woken up but the interrupt
won't happen before resuming I2C bus.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/sec-core.c

@@ -323,6 +323,8 @@ static int sec_pmic_probe(struct i2c_client *i2c,
 	if (ret)
 		goto err;
 
+	device_init_wakeup(sec_pmic->dev, sec_pmic->wakeup);
+
 	return ret;
 
 err:
@@ -341,6 +343,43 @@ static int sec_pmic_remove(struct i2c_client *i2c)
 	return 0;
 }
 
+static int sec_pmic_suspend(struct device *dev)
+{
+	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
+
+	if (device_may_wakeup(dev)) {
+		enable_irq_wake(sec_pmic->irq);
+		/*
+		 * PMIC IRQ must be disabled during suspend for RTC alarm
+		 * to work properly.
+		 * When device is woken up from suspend by RTC Alarm, an
+		 * interrupt occurs before resuming I2C bus controller.
+		 * The interrupt is handled by regmap_irq_thread which tries
+		 * to read RTC registers. This read fails (I2C is still
+		 * suspended) and RTC Alarm interrupt is disabled.
+		 */
+		disable_irq(sec_pmic->irq);
+	}
+
+	return 0;
+}
+
+static int sec_pmic_resume(struct device *dev)
+{
+	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+	struct sec_pmic_dev *sec_pmic = i2c_get_clientdata(i2c);
+
+	if (device_may_wakeup(dev)) {
+		disable_irq_wake(sec_pmic->irq);
+		enable_irq(sec_pmic->irq);
+	}
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(sec_pmic_pm_ops, sec_pmic_suspend, sec_pmic_resume);
+
 static const struct i2c_device_id sec_pmic_id[] = {
 	{ "sec_pmic", 0 },
 	{ }
@@ -351,6 +390,7 @@ static struct i2c_driver sec_pmic_driver = {
 	.driver = {
 		   .name = "sec_pmic",
 		   .owner = THIS_MODULE,
+		   .pm = &sec_pmic_pm_ops,
 		   .of_match_table = of_match_ptr(sec_dt_match),
 	},
 	.probe = sec_pmic_probe,