diff options
author | Thierry Reding <treding@nvidia.com> | 2016-07-27 14:55:53 +0200 |
---|---|---|
committer | Sebastian Huber <sebastian.huber@embedded-brains.de> | 2018-07-19 07:01:08 +0200 |
commit | da8eff9943780d1e294da14f096398196316f6d6 (patch) | |
tree | 5db91221a6fb74b66a54e21fe15a79a16e734756 /cpukit/include | |
parent | Correct a missing space in a fdt_header cast (diff) | |
download | rtems-da8eff9943780d1e294da14f096398196316f6d6.tar.bz2 |
libfdt: Add a subnodes iterator macro
The fdt_for_each_subnode() iterator macro provided by this patch can be
used to iterate over a device tree node's subnodes. At each iteration a
loop variable will be set to the next subnode.
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Diffstat (limited to 'cpukit/include')
-rw-r--r-- | cpukit/include/libfdt.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/cpukit/include/libfdt.h b/cpukit/include/libfdt.h index 36222fd4a6..911e548163 100644 --- a/cpukit/include/libfdt.h +++ b/cpukit/include/libfdt.h @@ -168,6 +168,34 @@ int fdt_first_subnode(const void *fdt, int offset); */ int fdt_next_subnode(const void *fdt, int offset); +/** + * fdt_for_each_subnode - iterate over all subnodes of a parent + * + * @node: child node (int, lvalue) + * @fdt: FDT blob (const void *) + * @parent: parent node (int) + * + * This is actually a wrapper around a for loop and would be used like so: + * + * fdt_for_each_subnode(node, fdt, parent) { + * Use node + * ... + * } + * + * if ((node < 0) && (node != -FDT_ERR_NOT_FOUND)) { + * Error handling + * } + * + * Note that this is implemented as a macro and @node is used as + * iterator in the loop. The parent variable be constant or even a + * literal. + * + */ +#define fdt_for_each_subnode(node, fdt, parent) \ + for (node = fdt_first_subnode(fdt, parent); \ + node >= 0; \ + node = fdt_next_subnode(fdt, node)) + /**********************************************************************/ /* General functions */ /**********************************************************************/ |