linux-kernel - [PATCH v3 1/5] hwmon: (core) Inherit power properties to hdev

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Message-Id: <20181024193402.16698-2-nicoleotsuka@gmail.com>
Date:   Wed, 24 Oct 2018 12:33:58 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     jdelvare@...e.com, linux@...ck-us.net
Cc:     linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/5] hwmon: (core) Inherit power properties to hdev

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@...il.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