Add a helper to set the initrd properties in the unflattened tree.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
drivers/of/base.c | 39 +++++++++++++++++++++++++++++++++++++++
include/of.h | 3 +++
2 files changed, 42 insertions(+)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 721db29..4dbe11e 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1201,3 +1201,42 @@ int of_device_is_stdout_path(struct device_d *dev)
return 0;
}
+
+/**
+ * of_add_initrd - add initrd properties to the devicetree
+ * @root - the root node of the tree
+ * @start - physical start address of the initrd image
+ * @end - physical end address of the initrd image
+ *
+ * Add initrd properties to the devicetree, or, if end is 0,
+ * delete them.
+ */
+int of_add_initrd(struct device_node *root, resource_size_t start,
+ resource_size_t end)
+{
+ struct device_node *chosen;
+ __be32 buf[2];
+
+ chosen = of_find_node_by_path(root, "/chosen");
+ if (!chosen)
+ return -EINVAL;
+
+ if (end) {
+ of_write_number(buf, start, 2);
+ of_set_property(chosen, "linux,initrd-start", buf, 8, 1);
+ of_write_number(buf, end, 2);
+ of_set_property(chosen, "linux,initrd-end", buf, 8, 1);
+ } else {
+ struct property *pp;
+
+ pp = of_find_property(chosen, "linux,initrd-start");
+ if (pp)
+ of_delete_property(pp);
+
+ pp = of_find_property(chosen, "linux,initrd-end");
+ if (pp)
+ of_delete_property(pp);
+ }
+
+ return 0;
+}
diff --git a/include/of.h b/include/of.h
index 6154490..1562f4e 100644
--- a/include/of.h
+++ b/include/of.h
@@ -68,6 +68,9 @@ struct driver_d;
int of_match(struct device_d *dev, struct driver_d *drv);
+int of_add_initrd(struct device_node *root, resource_size_t start,
+ resource_size_t end);
+
struct property *of_find_property(const struct device_node *node, const char *name);
struct device_node *of_find_node_by_path(struct device_node *root, const char *path);
--
1.7.10.4
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