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[U-Boot,v3,05/12] libfdt: Add iterator over properties

Message ID 20160624142757.32735-6-maxime.ripard@free-electrons.com
State Superseded
Delegated to: Pantelis Antoniou
Headers show

Commit Message

Maxime Ripard June 24, 2016, 2:27 p.m. UTC 
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>
---
 include/libfdt.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

Comments

Simon Glass June 26, 2016, 2:53 a.m. UTC | #1 
On 24 June 2016 at 08:27, Maxime Ripard
<maxime.ripard@free-electrons.com> wrote:
> 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>
> ---
>  include/libfdt.h | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)

Acked-by: Simon Glass <sjg@chromium.org>
diff mbox

Patch

diff --git a/include/libfdt.h b/include/libfdt.h
index 74b1d149c2dd..fbbe58ceb3f1 100644
--- a/include/libfdt.h
+++ b/include/libfdt.h
@@ -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