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pm: device: allow optional support of TURN_ON action

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Some devices, e.g. SoC level devices like I2C peripheral, can never be
powerd off as they are always energized. Such devices can only go from an
active state or to a low power state (suspended). Allow them to simply
return -ENOTSUP when called with TURN_ON (or TURN_OFF).

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
This commit is contained in:
Gerard Marull-Paretas 2024-09-23 10:29:40 +02:00 committed by Fabio Baltieri
parent f8bac1ac1b
commit 740eba1341
2 changed files with 4 additions and 3 deletions
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5
include/zephyr/pm/device.h
View file

@ -625,7 +625,8 @@ bool pm_device_is_powered(const struct device *dev);
* This helper function is intended to be called at the end of a driver
* init function to automatically setup the device into the lowest power
* mode. It assumes that the device has been configured as if it is in
* @ref PM_DEVICE_STATE_OFF.
* @ref PM_DEVICE_STATE_OFF, or @ref PM_DEVICE_STATE_SUSPENDED if device can
* never be powered off.
*
* @param dev Device instance.
* @param action_cb Device PM control callback function.
@ -718,7 +719,7 @@ static inline int pm_device_driver_init(const struct device *dev, pm_device_acti
/* When power management is not enabled, all drivers should initialise to active state */
rc = action_cb(dev, PM_DEVICE_ACTION_TURN_ON);
if (rc < 0) {
if ((rc < 0) && (rc != -ENOTSUP)) {
return rc;
}

2
subsys/pm/device.c
View file

@ -370,7 +370,7 @@ int pm_device_driver_init(const struct device *dev,
/* Run power-up logic */
rc = action_cb(dev, PM_DEVICE_ACTION_TURN_ON);
if (rc != 0) {
if ((rc < 0) && (rc != -ENOTSUP)) {
return rc;
}