linux-kernel - [PATCH 3/3] clk: add terminate callback to clk

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Date:   Tue, 24 Sep 2019 14:39:54 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>
Cc:     Jerome Brunet <jbrunet@...libre.com>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] clk: add terminate callback to clk_ops

Add a terminate callback to the clk_ops to release the resources
claimed in .init()

Signed-off-by: Jerome Brunet <jbrunet@...libre.com>
---
 drivers/clk/clk.c            | 7 ++++++-
 include/linux/clk-provider.h | 3 +++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index df853a98fad2..926f49c78b5d 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -3844,6 +3844,7 @@ static void clk_core_evict_parent_cache(struct clk_core *core)
 void clk_unregister(struct clk *clk)
 {
 	unsigned long flags;
+	const struct clk_ops *ops;
 
 	if (!clk || WARN_ON_ONCE(IS_ERR(clk)))
 		return;
@@ -3852,7 +3853,8 @@ void clk_unregister(struct clk *clk)
 
 	clk_prepare_lock();
 
-	if (clk->core->ops == &clk_nodrv_ops) {
+	ops = clk->core->ops;
+	if (ops == &clk_nodrv_ops) {
 		pr_err("%s: unregistered clock: %s\n", __func__,
 		       clk->core->name);
 		goto unlock;
@@ -3865,6 +3867,9 @@ void clk_unregister(struct clk *clk)
 	clk->core->ops = &clk_nodrv_ops;
 	clk_enable_unlock(flags);
 
+	if (ops->terminate)
+		ops->terminate(clk->core->hw);
+
 	if (!hlist_empty(&clk->core->children)) {
 		struct clk_core *child;
 		struct hlist_node *t;
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index b82ec4c4ca95..5a5a64785923 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -197,6 +197,8 @@ struct clk_duty {
  *		such as rate or parents.
  *		Returns 0 on success, -EERROR otherwise.
  *
+ * @terminate:  Free any resource allocated by init.
+ *
  * @debug_init:	Set up type-specific debugfs entries for this clock.  This
  *		is called once, after the debugfs directory entry for this
  *		clock has been created.  The dentry pointer representing that
@@ -248,6 +250,7 @@ struct clk_ops {
 	int		(*set_duty_cycle)(struct clk_hw *hw,
 					  struct clk_duty *duty);
 	int		(*init)(struct clk_hw *hw);
+	void		(*terminate)(struct clk_hw *hw);
 	void		(*debug_init)(struct clk_hw *hw, struct dentry *dentry);
 };
 
-- 
2.21.0