diff options
| -rw-r--r-- | drivers/clk/clk.c | 33 |
1 files changed, 30 insertions, 3 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 898052ee0efa..4912c2e55e2c 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -57,6 +57,7 @@ struct clk_core { struct clk_core *new_parent; struct clk_core *new_child; unsigned long flags; + bool orphan; unsigned int enable_count; unsigned int prepare_count; unsigned long min_rate; @@ -1091,18 +1092,40 @@ static int clk_fetch_parent_index(struct clk_core *core, return -EINVAL; } +/* + * Update the orphan status of @core and all its children. + */ +static void clk_core_update_orphan_status(struct clk_core *core, bool is_orphan) +{ + struct clk_core *child; + + core->orphan = is_orphan; + + hlist_for_each_entry(child, &core->children, child_node) + clk_core_update_orphan_status(child, is_orphan); +} + static void clk_reparent(struct clk_core *core, struct clk_core *new_parent) { + bool was_orphan = core->orphan; + hlist_del(&core->child_node); if (new_parent) { + bool becomes_orphan = new_parent->orphan; + /* avoid duplicate POST_RATE_CHANGE notifications */ if (new_parent->new_child == core) new_parent->new_child = NULL; hlist_add_head(&core->child_node, &new_parent->children); + + if (was_orphan != becomes_orphan) + clk_core_update_orphan_status(core, becomes_orphan); } else { hlist_add_head(&core->child_node, &clk_orphan_list); + if (!was_orphan) + clk_core_update_orphan_status(core, true); } core->parent = new_parent; @@ -2359,13 +2382,17 @@ static int __clk_init(struct device *dev, struct clk *clk_user) * clocks and re-parent any that are children of the clock currently * being clk_init'd. */ - if (core->parent) + if (core->parent) { hlist_add_head(&core->child_node, &core->parent->children); - else if (core->flags & CLK_IS_ROOT) + core->orphan = core->parent->orphan; + } else if (core->flags & CLK_IS_ROOT) { hlist_add_head(&core->child_node, &clk_root_list); - else + core->orphan = false; + } else { hlist_add_head(&core->child_node, &clk_orphan_list); + core->orphan = true; + } /* * Set clk's accuracy. The preferred method is to use |