device property: add description of fwnode cases

There are only four valid fwnode cases which are
- primary --> secondary --> -ENODEV
- primary --> NULL
- secondary --> -ENODEV
- NULL

dev->fwnode should be converted between the 4 cases above no matter
how/when set_primary_fwnode() and set_secondary_fwnode() are called.
Describe it in the code so people will keep it in mind.

Signed-off-by: Bard Liao <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Reviewed-by: Heikki Krogerus <[email protected]>
[ rjw: Comment edit ]
Signed-off-by: Rafael J. Wysocki <[email protected]>

0 files changed, 0 insertions, 0 deletions