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

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Message-Id: <20181017012426.26958-2-nicoleotsuka@gmail.com>
Date:   Tue, 16 Oct 2018 18:24:22 -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 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>
---
 drivers/hwmon/hwmon.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/hwmon/hwmon.c b/drivers/hwmon/hwmon.c
index 975c95169884..7c064e1218ba 100644
--- a/drivers/hwmon/hwmon.c
+++ b/drivers/hwmon/hwmon.c
@@ -625,6 +625,9 @@ __hwmon_device_register(struct device *dev, const char *name, void *drvdata,
 	hwdev->name = name;
 	hdev->class = &hwmon_class;
 	hdev->parent = dev;
+	hdev->driver = dev->driver;
+	hdev->power = dev->power;
+	hdev->pm_domain = dev->pm_domain;
 	hdev->of_node = dev ? dev->of_node : NULL;
 	hwdev->chip = chip;
 	dev_set_drvdata(hdev, drvdata);
-- 
2.17.1