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author | Simon Glass <sjg@chromium.org> | 2012-04-02 13:18:42 +0000 |
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committer | Albert ARIBAUD <albert.u.boot@aribaud.net> | 2012-05-15 08:31:36 +0200 |
commit | 3ddecfc74086aa185a2f671cc07cb826b72d35f0 (patch) | |
tree | ae643a3369183c2286b8e2a9c503eb4f40d759be | |
parent | 96875e7d3b9900d0e63f0b591ff5693b31c4d9c3 (diff) | |
download | u-boot-imx-3ddecfc74086aa185a2f671cc07cb826b72d35f0.zip u-boot-imx-3ddecfc74086aa185a2f671cc07cb826b72d35f0.tar.gz u-boot-imx-3ddecfc74086aa185a2f671cc07cb826b72d35f0.tar.bz2 |
fdt: Add function to return next compatible subnode
We need to iterate through subnodes of a parent, looking only at
compatible nodes. Add a utility function to do this for us.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
-rw-r--r-- | include/fdtdec.h | 17 | ||||
-rw-r--r-- | lib/fdtdec.c | 15 |
2 files changed, 32 insertions, 0 deletions
diff --git a/include/fdtdec.h b/include/fdtdec.h index 84f0768..0351a25 100644 --- a/include/fdtdec.h +++ b/include/fdtdec.h @@ -117,6 +117,23 @@ int fdtdec_next_compatible(const void *blob, int node, enum fdt_compat_id id); /** + * Find the next compatible subnode for a peripheral. + * + * Do the first call with node set to the parent and depth = 0. This + * function will return the offset of the next compatible node. Next time + * you call this function, pass the node value returned last time, with + * depth unchanged, and the next node will be provided. + * + * @param blob FDT blob to use + * @param node Start node for search + * @param id Compatible ID to look for (enum fdt_compat_id) + * @param depthp Current depth (set to 0 before first call) + * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more + */ +int fdtdec_next_compatible_subnode(const void *blob, int node, + enum fdt_compat_id id, int *depthp); + +/** * Look up an address property in a node and return it as an address. * The property must hold either one address with no trailing data or * one address with a length. This is only tested on 32-bit machines. diff --git a/lib/fdtdec.c b/lib/fdtdec.c index 4a5ab71..76d3808 100644 --- a/lib/fdtdec.c +++ b/lib/fdtdec.c @@ -133,6 +133,21 @@ int fdtdec_next_compatible(const void *blob, int node, return fdt_node_offset_by_compatible(blob, node, compat_names[id]); } +int fdtdec_next_compatible_subnode(const void *blob, int node, + enum fdt_compat_id id, int *depthp) +{ + do { + node = fdt_next_node(blob, node, depthp); + } while (*depthp > 1); + + /* If this is a direct subnode, and compatible, return it */ + if (*depthp == 1 && 0 == fdt_node_check_compatible( + blob, node, compat_names[id])) + return node; + + return -FDT_ERR_NOTFOUND; +} + int fdtdec_next_alias(const void *blob, const char *name, enum fdt_compat_id id, int *upto) { |