[U-Boot] [PATCH v2 04/10] fdt: Add fdt_getprop_u32_default helpers

Kumar Gala
2008-10-23T12:58:48Z

Add helper functions to return find a node and return it's property
or a default value.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
---
common/fdt_support.c | 27 +++++++++++++++++++++++++++
include/fdt_support.h | 2 ++
2 files changed, 29 insertions(+), 0 deletions(-)

diff --git a/common/fdt_support.c b/common/fdt_support.c
index 8ceeb0f..f430777 100644
--- a/common/fdt_support.c
+++ b/common/fdt_support.c
@@ -35,6 +35,33 @@
*/
DECLARE_GLOBAL_DATA_PTR;

+/**
+ * fdt_getprop_u32_default - Find a node and return it's property or a default
+ *
+ * @fdt: ptr to device tree
+ * @path: path of node
+ * @prop: property name
+ * @dflt: default value if the property isn't found
+ *
+ * Convenience function to find a node and return it's property or a
+ * default value if it doesn't exist.
+ */
+u32 fdt_getprop_u32_default(void *fdt, const char *path, const char *prop,
+ const u32 dflt)
+{
+ const u32 *val;
+ int off;
+
+ off = fdt_path_offset(fdt, path);
+ if (off < 0)
+ return dflt;
+
+ val = fdt_getprop(fdt, off, prop, NULL);
+ if (val)
+ return *val;
+ else
+ return dflt;
+}

/**
* fdt_find_and_setprop: Find a node and set it's property
diff --git a/include/fdt_support.h b/include/fdt_support.h
index ceaadc2..816c9d0 100644
--- a/include/fdt_support.h
+++ b/include/fdt_support.h
@@ -28,6 +28,8 @@

#include <fdt.h>

+u32 fdt_getprop_u32_default(void *fdt, const char *path, const char *prop,
+ const u32 dflt);
int fdt_chosen(void *fdt, int force);
int fdt_initrd(void *fdt, ulong initrd_start, ulong initrd_end, int force);
void do_fixup_by_path(void *fdt, const char *path, const char *prop,
--
1.5.5.1