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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>
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@ -791,3 +791,73 @@ ofnode ofnode_by_prop_value(ofnode from, const char *propname,
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propname, propval, proplen));
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}
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}
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int ofnode_write_prop(ofnode node, const char *propname, int len,
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const void *value)
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{
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const struct device_node *np = ofnode_to_np(node);
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struct property *pp;
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struct property *pp_last = NULL;
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struct property *new;
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if (!of_live_active())
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return -ENOSYS;
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if (!np)
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return -EINVAL;
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for (pp = np->properties; pp; pp = pp->next) {
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if (strcmp(pp->name, propname) == 0) {
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/* Property exists -> change value */
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pp->value = (void *)value;
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pp->length = len;
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return 0;
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}
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pp_last = pp;
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}
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if (!pp_last)
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return -ENOENT;
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/* Property does not exist -> append new property */
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new = malloc(sizeof(struct property));
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if (!new)
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return -ENOMEM;
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new->name = strdup(propname);
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if (!new->name)
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return -ENOMEM;
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new->value = (void *)value;
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new->length = len;
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new->next = NULL;
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pp_last->next = new;
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return 0;
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}
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int ofnode_write_string(ofnode node, const char *propname, const char *value)
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{
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if (!of_live_active())
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return -ENOSYS;
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assert(ofnode_valid(node));
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debug("%s: %s = %s", __func__, propname, value);
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return ofnode_write_prop(node, propname, strlen(value) + 1, value);
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}
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int ofnode_set_enabled(ofnode node, bool value)
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{
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if (!of_live_active())
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return -ENOSYS;
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assert(ofnode_valid(node));
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if (value)
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return ofnode_write_string(node, "status", "okay");
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else
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return ofnode_write_string(node, "status", "disable");
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}
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@ -764,4 +764,50 @@ u64 ofnode_translate_address(ofnode node, const fdt32_t *in_addr);
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* @return true if OK, false if the compatible is not found
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*/
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int ofnode_device_is_compatible(ofnode node, const char *compat);
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/**
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* ofnode_write_prop() - Set a property of a ofnode
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*
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* Note that the value passed to the function is *not* allocated by the
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* function itself, but must be allocated by the caller if necessary.
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*
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* @node: The node for whose property should be set
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* @propname: The name of the property to set
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* @len: The length of the new value of the property
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* @value: The new value of the property (must be valid prior to calling
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* the function)
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* @return 0 if successful, -ve on error
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*/
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int ofnode_write_prop(ofnode node, const char *propname, int len,
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const void *value);
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/**
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* ofnode_write_string() - Set a string property of a ofnode
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*
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* Note that the value passed to the function is *not* allocated by the
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* function itself, but must be allocated by the caller if necessary.
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*
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* @node: The node for whose string property should be set
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* @propname: The name of the string property to set
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* @value: The new value of the string property (must be valid prior to
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* calling the function)
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* @return 0 if successful, -ve on error
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*/
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int ofnode_write_string(ofnode node, const char *propname, const char *value);
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/**
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* ofnode_set_enabled() - Enable or disable a device tree node given by its
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* ofnode
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*
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* This function effectively sets the node's "status" property to either "okay"
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* or "disable", hence making it available for driver model initialization or
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* not.
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*
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* @node: The node to enable
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* @value: Flag that tells the function to either disable or enable the
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* node
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* @return 0 if successful, -ve on error
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*/
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int ofnode_set_enabled(ofnode node, bool value);
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#endif
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