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doc: dts: update devicetree howto to use DT_INST_FOREACH

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Updated howto "create struct devices in a driver" section to use
DT_INST_FOREACH instead of manual per-instance macros.

Signed-off-by: Ioannis Papamanoglou <iopapamanoglou@gmail.com>
This commit is contained in:
Ioannis Papamanoglou 2020-03-26 10:10:15 +01:00 • committed by Kumar Gala
commit 03700763e6
1 changed files with 5 additions and 12 deletions
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17
doc/guides/dts/howtos.rst
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@ -388,19 +388,12 @@ enabled instance. Currently, this looks like this:
MY_DEV_INIT_LEVEL, MY_DEV_INIT_PRIORITY, \
&my_api_funcs)
#if DT_HAS_NODE(DT_DRV_INST(0))
CREATE_MY_DEVICE(0);
#endif
/* Call the device creation macro for every compatible node: */
DT_INST_FOREACH(CREATE_MY_DEVICE);
#if DT_HAS_NODE(DT_DRV_INST(1))
CREATE_MY_DEVICE(1);
#endif
/* And so on, for all "possible" instance numbers you need to support. */
Notice the use of :c:func:`DT_INST_PROP` and :c:func:`DT_DRV_INST`. These are
helpers which rely on ``DT_DRV_COMPAT`` to choose devicetree nodes of a chosen
compatible at a given index.
Notice the use of :c:func:`DT_INST_PROP` and :c:func:`DT_INST_FOREACH`.
These are helpers which rely on ``DT_DRV_COMPAT`` to choose devicetree nodes
of a chosen compatible at a given index.
As shown above, the driver uses additional information from
:file:`devicetree.h` to create :ref:`struct device <device_struct>` instances