From eda76d492d754d395053995b445c3107ce4a0802 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Wed, 27 Jul 2016 14:55:54 +0200 Subject: 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 Acked-by: Simon Glass [dwg: Removed a stray trailing blank line] Signed-off-by: David Gibson --- cpukit/include/libfdt.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) (limited to 'cpukit') 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 @@ -458,6 +458,33 @@ 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 -- cgit v1.2.3