core: Add functions to set properties in live-tree
Implement a set of functions to manipulate properties in a live device
tree:
* ofnode_write_prop() to set generic properties of a node
* ofnode_write_string() to set string properties of a node
* ofnode_set_enabled() to either enable or disable a node
Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index a7e1927..1e35480 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -791,3 +791,73 @@
propname, propval, proplen));
}
}
+
+int ofnode_write_prop(ofnode node, const char *propname, int len,
+ const void *value)
+{
+ const struct device_node *np = ofnode_to_np(node);
+ struct property *pp;
+ struct property *pp_last = NULL;
+ struct property *new;
+
+ if (!of_live_active())
+ return -ENOSYS;
+
+ if (!np)
+ return -EINVAL;
+
+ for (pp = np->properties; pp; pp = pp->next) {
+ if (strcmp(pp->name, propname) == 0) {
+ /* Property exists -> change value */
+ pp->value = (void *)value;
+ pp->length = len;
+ return 0;
+ }
+ pp_last = pp;
+ }
+
+ if (!pp_last)
+ return -ENOENT;
+
+ /* Property does not exist -> append new property */
+ new = malloc(sizeof(struct property));
+ if (!new)
+ return -ENOMEM;
+
+ new->name = strdup(propname);
+ if (!new->name)
+ return -ENOMEM;
+
+ new->value = (void *)value;
+ new->length = len;
+ new->next = NULL;
+
+ pp_last->next = new;
+
+ return 0;
+}
+
+int ofnode_write_string(ofnode node, const char *propname, const char *value)
+{
+ if (!of_live_active())
+ return -ENOSYS;
+
+ assert(ofnode_valid(node));
+
+ debug("%s: %s = %s", __func__, propname, value);
+
+ return ofnode_write_prop(node, propname, strlen(value) + 1, value);
+}
+
+int ofnode_set_enabled(ofnode node, bool value)
+{
+ if (!of_live_active())
+ return -ENOSYS;
+
+ assert(ofnode_valid(node));
+
+ if (value)
+ return ofnode_write_string(node, "status", "okay");
+ else
+ return ofnode_write_string(node, "status", "disable");
+}
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index c06d778..2fc9fa3 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -764,4 +764,50 @@
* @return true if OK, false if the compatible is not found
*/
int ofnode_device_is_compatible(ofnode node, const char *compat);
+
+/**
+ * ofnode_write_prop() - Set a property of a ofnode
+ *
+ * Note that the value passed to the function is *not* allocated by the
+ * function itself, but must be allocated by the caller if necessary.
+ *
+ * @node: The node for whose property should be set
+ * @propname: The name of the property to set
+ * @len: The length of the new value of the property
+ * @value: The new value of the property (must be valid prior to calling
+ * the function)
+ * @return 0 if successful, -ve on error
+ */
+int ofnode_write_prop(ofnode node, const char *propname, int len,
+ const void *value);
+
+/**
+ * ofnode_write_string() - Set a string property of a ofnode
+ *
+ * Note that the value passed to the function is *not* allocated by the
+ * function itself, but must be allocated by the caller if necessary.
+ *
+ * @node: The node for whose string property should be set
+ * @propname: The name of the string property to set
+ * @value: The new value of the string property (must be valid prior to
+ * calling the function)
+ * @return 0 if successful, -ve on error
+ */
+int ofnode_write_string(ofnode node, const char *propname, const char *value);
+
+/**
+ * ofnode_set_enabled() - Enable or disable a device tree node given by its
+ * ofnode
+ *
+ * This function effectively sets the node's "status" property to either "okay"
+ * or "disable", hence making it available for driver model initialization or
+ * not.
+ *
+ * @node: The node to enable
+ * @value: Flag that tells the function to either disable or enable the
+ * node
+ * @return 0 if successful, -ve on error
+ */
+int ofnode_set_enabled(ofnode node, bool value);
+
#endif