Implement a set of functions to manipulate properties in a live device
tree:
* ofnode_set_property() to set generic properties of a node
* ofnode_write_string() to set string properties of a node
* ofnode_enable() to enable a node
* ofnode_disable() to disable a node
Signed-off-by: Mario Six <mario....@gdsys.cc>
---
drivers/core/ofnode.c | 58 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/dm/ofnode.h | 49 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 107 insertions(+)
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index ca002063b3..90d05aa559 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -699,3 +699,61 @@ u64 ofnode_translate_address(ofnode node, const fdt32_t
*in_addr)
else
return fdt_translate_address(gd->fdt_blob,
ofnode_to_offset(node), in_addr);
}
+
+#ifdef CONFIG_OF_LIVE
+int ofnode_set_property(ofnode node, const char *propname, int len,
+ const void *value)
+{
+ const struct device_node *np = ofnode_to_np(node);
+ struct property *pp;
+ struct property *new;
+
+ 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;
+ }
+ }
+
+ /* Property does not exist -> append new property */
+ new = malloc(sizeof(struct property));
+
+ new->name = strdup(propname);
+ new->value = malloc(len);
+ memcpy(new->value, value, len);
+ new->length = len;
+ new->next = NULL;
+
+ pp->next = new;
+
+ return 0;
+}
+
+int ofnode_write_string(ofnode node, const char *propname, const char *value)
+{
+ assert(ofnode_valid(node));
+ debug("%s: %s = %s", __func__, propname, value);
+
+ return ofnode_set_property(node, propname, strlen(value) + 1, value);
+}
+
+int ofnode_enable(ofnode node)
+{
+ assert(ofnode_valid(node));
+
+ return ofnode_write_string(node, "status", "okay");
+}
+
+int ofnode_disable(ofnode node)
+{
+ assert(ofnode_valid(node));
+
+ return ofnode_write_string(node, "status", "disable");
+}
+
+#endif
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index aec205eb80..e82ebf19c5 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -689,4 +689,53 @@ int ofnode_read_resource_byname(ofnode node, const char
*name,
* @return the translated address; OF_BAD_ADDR on error
*/
u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr);
+
+#ifdef CONFIG_OF_LIVE
+
+/**
+ * ofnode_set_property() - Set a property of a ofnode
+ *
+ * @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
+ * @return 0 if successful, -ve on error
+ */
+int ofnode_set_property(ofnode node, const char *propname, int len,
+ const void *value);
+
+/**
+ * ofnode_write_string() - Set a string property of a ofnode
+ *
+ * @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
+ * @return 0 if successful, -ve on error
+ */
+int ofnode_write_string(ofnode node, const char *propname, const char *value);
+
+/**
+ * ofnode_enable() - Enable a device tree node given by its ofnode
+ *
+ * This function effectively sets the node's "status" property to "okay", hence
+ * making it available for driver model initialization.
+ *
+ * @node: The node to enable
+ * @return 0 if successful, -ve on error
+ */
+int ofnode_enable(ofnode node);
+
+/**
+ * ofnode_disable() - Disable a device tree node given by its ofnode
+ *
+ * This function effectively sets the node's "status" property to "disable",
+ * hence stopping it from being picked up by driver model initialization.
+ *
+ * @node: The node to disable
+ * @return 0 if successful, -ve on error
+ */
+int ofnode_disable(ofnode node);
+
+#endif
+
#endif
--
2.16.1
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