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    Subject[PATCH v3 1/5] hwmon: (core) Inherit power properties to hdev
    Date
    The new hdev is a child device related to the original parent
    hwmon driver and its device. However, it doesn't support the
    power features, typically being defined in the parent driver.

    So this patch inherits three necessary power properties from
    the parent dev to hdev: power, pm_domain and driver pointers.

    Note that the dev->driver pointer is the place that contains
    a dev_pm_ops pointer defined in the parent device driver and
    the pm runtime core also checks this pointer:
    if (!cb && dev->driver && dev->driver->pm)

    Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
    ---
    Changelog
    v2->v3:
    * N/A
    v1->v2:
    * Added device pointers

    drivers/hwmon/hwmon.c | 7 ++++++-
    1 file changed, 6 insertions(+), 1 deletion(-)

    diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
    index 975c95169884..14cfab64649f 100644
    --- a/drivers/hwmon/hwmon.c
    +++ b/drivers/hwmon/hwmon.c
    @@ -625,7 +625,12 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
    hwdev->name = name;
    hdev->class = &hwmon_class;
    hdev->parent = dev;
    - hdev->of_node = dev ? dev->of_node : NULL;
    + if (dev) {
    + hdev->driver = dev->driver;
    + hdev->power = dev->power;
    + hdev->pm_domain = dev->pm_domain;
    + hdev->of_node = dev->of_node;
    + }
    hwdev->chip = chip;
    dev_set_drvdata(hdev, drvdata);
    dev_set_name(hdev, HWMON_ID_FORMAT, id);
    --
    2.17.1
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