Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Signed-off-by: Jianyong Wu <jianyong.wu@xxxxxxx>
Signed-off-by: Jia He <justin.he@xxxxxxx>
---
lib/fdt/exportsyms.uk | 1 +
lib/fdt/fdt_ro.c | 18 ++++++++++++++++++
lib/fdt/include/libfdt.h | 21 +++++++++++++++++++++
3 files changed, 40 insertions(+)
diff --git a/lib/fdt/exportsyms.uk b/lib/fdt/exportsyms.uk
index 2fe4c32..d64d9dc 100644
--- a/lib/fdt/exportsyms.uk
+++ b/lib/fdt/exportsyms.uk
@@ -60,3 +60,4 @@ fdt_size_cells
fdt_stringlist_contains
fdt_resize
fdt_overlay_apply
+fdt_getprop_u32_by_offset
diff --git a/lib/fdt/fdt_ro.c b/lib/fdt/fdt_ro.c
index 08de2cc..9077cff 100644
--- a/lib/fdt/fdt_ro.c
+++ b/lib/fdt/fdt_ro.c
@@ -438,6 +438,24 @@ int fdt_get_path(const void *fdt, int nodeoffset, char
*buf, int buflen)
return offset; /* error from fdt_next_node() */
}
+int fdt_getprop_u32_by_offset(const void *fdt, int offset,
+ const char *name, uint32_t *out)
+{
+ const fdt32_t *prop;
+ int prop_len;
+
+ prop = fdt_getprop(fdt, offset, name, &prop_len);
+ if (!prop)
+ return prop_len;
+
+ if (prop_len >= sizeof(fdt32_t)) {
+ *out = fdt32_to_cpu(prop[0]);
+ return 0;
+ }
+
+ return -FDT_ERR_NOTFOUND;
+}
+
int fdt_supernode_atdepth_offset(const void *fdt, int nodeoffset,
int supernodedepth, int *nodedepth)
{
diff --git a/lib/fdt/include/libfdt.h b/lib/fdt/include/libfdt.h
index 05dedbd..1383f42 100644
--- a/lib/fdt/include/libfdt.h
+++ b/lib/fdt/include/libfdt.h
@@ -768,6 +768,27 @@ const char *fdt_get_alias(const void *fdt, const char
*name);
*/
int fdt_get_path(const void *fdt, int nodeoffset, char *buf, int buflen);
+/**
+ * fdt_getprop_u32_by_offset - retrieve u32 of a given property
+ * @fdt: pointer to the device tree blob
+ * @nodeoffset: offset of the node whose property to find
+ * @name: name of the property to find
+ * @out: pointer to u32 variable (will be overwritten) or NULL
+ *
+ * fdt_getprop_u32_by_offset() retrieves u32 to the value of the property
+ * named 'name' of the node at offset nodeoffset (this will be a
+ * pointer to within the device blob itself, not a copy of the value).
+ * If out is non-NULL, the u32 of the property value is returned.
+ *
+ * returns:
+ * 0, on success
+ * out contains the u32 of a given property at nodeoffset.
+ * -FDT_ERR_NOTFOUND, node does not have named property
+ * -FDT_ERR_BADNCELLS,
+ */
+int fdt_getprop_u32_by_offset(const void *fdt, int nodeoffset,
+ const char *name, uint32_t *out);
+
/**
* fdt_supernode_atdepth_offset - find a specific ancestor of a node
* @fdt: pointer to the device tree blob
