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authorMaxime Ripard <maxime.ripard@free-electrons.com>2016-07-27 14:55:54 +0200
committerSebastian Huber <sebastian.huber@embedded-brains.de>2018-07-19 07:01:08 +0200
commiteda76d492d754d395053995b445c3107ce4a0802 (patch)
tree5ee474097118391dfafa70ef84c1b085c886bddc
parentlibfdt: Add a subnodes iterator macro (diff)
downloadrtems-eda76d492d754d395053995b445c3107ce4a0802.tar.bz2
libfdt: Add iterator over properties
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> [dwg: Removed a stray trailing blank line] Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
-rw-r--r--cpukit/include/libfdt.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/cpukit/include/libfdt.h b/cpukit/include/libfdt.h
index 911e548163..be109a8aac 100644
--- a/cpukit/include/libfdt.h
+++ b/cpukit/include/libfdt.h
@@ -459,6 +459,33 @@ int fdt_first_property_offset(const void *fdt, int nodeoffset);
int fdt_next_property_offset(const void *fdt, int offset);
/**
+ * fdt_for_each_property_offset - iterate over all properties of a node
+ *
+ * @property_offset: property offset (int, lvalue)
+ * @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_offset(property, fdt, node) {
+ * Use property
+ * ...
+ * }
+ *
+ * if ((property < 0) && (property != -FDT_ERR_NOT_FOUND)) {
+ * Error handling
+ * }
+ *
+ * Note that this is implemented as a macro and property is used as
+ * iterator in the loop. The node variable 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
* @offset: offset of the property to retrieve