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libfdt: Add iterator over properties

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Implement a macro based on fdt_first_property_offset and
fdt_next_property_offset that provides a convenience to iterate over all
the properties of a given node.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Maxime Ripard 2016-07-05 10:26:38 +02:00 committed by Tom Rini
parent 805ac6aacf
commit 67e610d9f0
1 changed files with 24 additions and 0 deletions
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24
include/libfdt.h
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@ -440,6 +440,30 @@ int fdt_first_property_offset(const void *fdt, int nodeoffset);
*/
int fdt_next_property_offset(const void *fdt, int offset);
/**
* fdt_for_each_property - iterate over all properties of a node
* @property_offset: property offset (int)
* @fdt: FDT blob (const void *)
* @node: node offset (int)
*
* This is actually a wrapper around a for loop and would be used like so:
*
* fdt_for_each_property(fdt, node, property) {
* ...
* use property
* ...
* }
*
* Note that this is implemented as a macro and property is used as
* iterator in the loop. It should therefore be a locally allocated
* variable. The node variable on the other hand is never modified, so
* it can be constant or even a literal.
*/
#define fdt_for_each_property_offset(property, fdt, node) \
for (property = fdt_first_property_offset(fdt, node); \
property >= 0; \
property = fdt_next_property_offset(fdt, property))
/**
* fdt_get_property_by_offset - retrieve the property at a given offset
* @fdt: pointer to the device tree blob