From: Wolfram Sang <>

The adapter device is a logical device. Because of that, it already uses
pm_runtime_no_callbacks() in the core. To ensure proper propagation from
the children (i2c devices) to the parent of the adapter (the HW device),
make sure RuntimePM is enabled in any case.

Signed-off-by: Wolfram Sang <>
 drivers/i2c/i2c-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index e94d2ca2aab4aa..55159e8e53283a 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1610,6 +1610,7 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
        dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
+       pm_runtime_enable(&adap->dev);
        res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev,
@@ -1864,6 +1865,8 @@ void i2c_del_adapter(struct i2c_adapter *adap)
        /* device name is gone after device_unregister */
        dev_dbg(&adap->dev, "adapter [%s] unregistered\n", adap->name);
+       pm_runtime_disable(&adap->dev);
        /* wait until all references to the device are gone
         * FIXME: This is old code and should ideally be replaced by an

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