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    Subject[PATCH v6 02/23] mfd: max77686: Add power management support
    Date
    The driver doesn't have PM operations defined so add a suspend
    and resume function handlers to allow the PMIC IRQ to wakeup
    the system when it is put into a sleep state.

    Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
    ---
    drivers/mfd/max77686.c | 40 ++++++++++++++++++++++++++++++++++++++++
    1 file changed, 40 insertions(+)

    diff --git a/drivers/mfd/max77686.c b/drivers/mfd/max77686.c
    index 3cb41d0..a38e9ee 100644
    --- a/drivers/mfd/max77686.c
    +++ b/drivers/mfd/max77686.c
    @@ -240,10 +240,50 @@ static const struct i2c_device_id max77686_i2c_id[] = {
    };
    MODULE_DEVICE_TABLE(i2c, max77686_i2c_id);

    +#ifdef CONFIG_PM_SLEEP
    +static int max77686_suspend(struct device *dev)
    +{
    + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
    + struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
    +
    + if (device_may_wakeup(dev))
    + enable_irq_wake(max77686->irq);
    +
    + /*
    + * IRQ must be disabled during suspend because if it happens
    + * while suspended it will be handled before resuming I2C.
    + *
    + * When device is woken up from suspend (e.g. by RTC wake alarm),
    + * an interrupt occurs before resuming I2C bus controller.
    + * Interrupt handler tries to read registers but this read
    + * will fail because I2C is still suspended.
    + */
    + disable_irq(max77686->irq);
    +
    + return 0;
    +}
    +
    +static int max77686_resume(struct device *dev)
    +{
    + struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
    + struct max77686_dev *max77686 = i2c_get_clientdata(i2c);
    +
    + if (device_may_wakeup(dev))
    + disable_irq_wake(max77686->irq);
    +
    + enable_irq(max77686->irq);
    +
    + return 0;
    +}
    +#endif /* CONFIG_PM_SLEEP */
    +
    +static SIMPLE_DEV_PM_OPS(max77686_pm, max77686_suspend, max77686_resume);
    +
    static struct i2c_driver max77686_i2c_driver = {
    .driver = {
    .name = "max77686",
    .owner = THIS_MODULE,
    + .pm = &max77686_pm,
    .of_match_table = of_match_ptr(max77686_pmic_dt_match),
    },
    .probe = max77686_i2c_probe,
    --
    2.0.0.rc2


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