The macro is searching for all instances of specific device
that contain specific property and evaluates to true (1) if
any device does.
The macro used to do that by generating, using
DT_ANY_INST_HAS_PROP_STATUS_OKAY, a logical expression
like (0 || 1 || 0), where each digit represented existence of
property (1) or lack of it (0).
Unfortunately other util macros, like IS_ENABLED, were
not able to evaluate such expression, as they often simply
expect something they can evaluate to 0 or 1.
The commit here changes DT_ANY_INST_HAS_PROP_STATUS_OKAY
to generate a list of tokens (1) where token is added to list
only for instance of a device that has the property;
then such list is processed using IS_EMPTY() macro and
in the end 0 or 1 is generated, depending on whether
any enabled instance of a device has the property or not.
This change allows result of DT_ANY_INST_HAS_PROP_STATUS_OKAY
to be used with macros like IS_ENABLED, IF_ENABLED or
COND_CODE_x.
Signed-off-by: Dominik Ermel <dominik.ermel@nordicsemi.no>
4c8ed7dd9a