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 <s...@chromium.org>
---
Changes in v3:
- Add new fdtdec_next_compatible_subnode() patch
include/fdtdec.h | 17 +++++++++++++++++
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)
{
--
1.7.7.3
_______________________________________________
U-Boot mailing list
U-Boot@lists.denx.de
http://lists.denx.de/mailman/listinfo/u-boot
