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device_pm: correct nop documented behavior

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The device_pm_control_nop function is documented to always return zero
regardless of operation.  However, when device_get_power_state() is
invoked with this control function it returns success leaving the
output parameter state unmodified, which may not be a valid device
state.

Document and implement that the nop control function returns -ENOTSUP
always.

Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
This commit is contained in:
Peter Bigot 2020-05-20 08:58:56 -05:00 • committed by Carles Cufí
commit ae935dccdf
2 changed files with 2 additions and 2 deletions
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include/device.h
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@ -387,7 +387,7 @@ void device_busy_clear(struct device *busy_dev);
* @param cb Unused
* @param unused_arg Unused
*
* @retval 0 Always returns 0
* @retval -ENOTSUP for all operations.
*/
int device_pm_control_nop(struct device *unused_device,
u32_t unused_ctrl_command,