+/**
+ * omap_clk_for_each_child - call callback on each child clock of clk
+ * @clk: struct clk * to use as the "parent"
+ * @parent_rate: rate of the parent of @clk to pass along
+ * @rate_storage: flag indicating whether current or temporary rates are used
+ * @cb: pointer to a callback function
+ *
+ * For each child clock of @clk, call the callback function @cb, passing
+ * along the contents of @parent_rate and @rate_storage. If the callback
+ * function returns non-zero, terminate the function and pass along the
+ * return value.
+ */
+static int omap_clk_for_each_child(struct clk *clk, unsigned long parent_rate,
+ u8 rate_storage,
+ int (*cb)(struct clk *clk,
+ unsigned long parent_rate,
+ u8 rate_storage))
+{
+ struct clk_child *child;
+ int ret;
+
+ list_for_each_entry(child, &clk->children, node) {
+ ret = (*cb)(child->clk, parent_rate, rate_storage);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * omap_clk_has_children - does clk @clk have any child clocks?
+ * @clk: struct clk * to test for child clocks
+ *
+ * If clock @clk has any child clocks, return 1; otherwise, return 0.
+ */
+static int omap_clk_has_children(struct clk *clk)
+{
+ return (list_empty(&clk->children)) ? 0 : 1;
+}
+
+/**
+ * _do_propagate_rate - callback function for rate propagation
+ * @clk: struct clk * to recalc and propagate from
+ * @parent_rate: rate of the parent of @clk, to use in recalculation
+ * @rate_storage: flag indicating whether current or temporary rates are used
+ *
+ * If @clk has a recalc function, call it. If @clk has any children,
+ * propagate @clk's rate. Returns 0.
+ */
+static int _do_propagate_rate(struct clk *clk, unsigned long parent_rate,
+ u8 rate_storage)
+{
+ if (clk->recalc)
+ clk->recalc(clk, parent_rate, rate_storage);
+ if (omap_clk_has_children(clk))
+ propagate_rate(clk, rate_storage);
+ return 0;
+}
+
+/**
+ * omap_clk_add_child - add a child clock @clk2 to @clk
+ * @clk: parent struct clk *
+ * @clk2: new child struct clk *
+ *
+ * Add a child clock @clk2 to the list of children of parent clock
+ * @clk. Will potentially allocate memory from bootmem or, if
+ * available, from slab. Must only be called with the clock framework
+ * spinlock held. No return value.
+ */
+void omap_clk_add_child(struct clk *clk, struct clk *clk2)
+{
+ struct clk_child *child;
+ int reuse = 0;
+
+ if (!clk->children.next)
+ INIT_LIST_HEAD(&clk->children);
+
+ list_for_each_entry(child, &clk->children, node) {
+ if (child->flags & CLK_CHILD_DELETED) {
+ reuse = 1;
+ child->flags &= ~CLK_CHILD_DELETED;
+ break;
+ }
+ }
+
+ if (!reuse) {
+ if (slab_is_available())
+ child = kmalloc(sizeof(struct clk_child), GFP_ATOMIC);
+ else
+ child = alloc_bootmem(sizeof(struct clk_child));
+
+ if (!child) {
+ WARN_ON(1);
+ return;
+ }
+
+ memset(child, 0, sizeof(struct clk_child));
+
+ if (slab_is_available())
+ child->flags |= CLK_CHILD_SLAB_ALLOC;
+ }
+
+ child->clk = clk2;
+
+ list_add_tail(&child->node, &clk->children);
+}
+
+/**
+ * omap_clk_del_child - add a child clock @clk2 to @clk
+ * @clk: parent struct clk *
+ * @clk2: former child struct clk *
+ *
+ * Remove a child clock @clk2 from the list of children of parent
+ * clock @clk. Must only be called with the clock framework spinlock
+ * held. No return value.
+ */
+void omap_clk_del_child(struct clk *clk, struct clk *clk2)
+{
+ struct clk_child *child, *tmp;
+
+ /* Loop over all existing clk_childs, when found, deallocate */
+ list_for_each_entry_safe(child, tmp, &clk->children, node) {
+ if (child->clk == clk2) {
+ list_del(&child->node);
+ if (child->flags & CLK_CHILD_SLAB_ALLOC) {
+ kfree(child);
+ } else {
+ child->clk = NULL;
+ child->flags |= CLK_CHILD_DELETED;
+ }
+ break;
+ }
+ }
+}
+