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From: Jun Nie <>
Cc: Jun Nie <>
Subject: [PATCH] clk: Add is_enabled sanity check
Date: Fri, 22 Apr 2016 10:32:36 +0800	[thread overview]
Message-ID: <> (raw)

If .enable and .disable is implemented, we must implement .is_enabled
per document. Otherwise, clk_disable_unused_subtree will not disable
the unused clock if the .is_enabled is not implemented, unecessary
power consumption happens on the clock as a result.

Signed-off-by: Jun Nie <>
 drivers/clk/clk.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index f13c3f4..5e63bee 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2526,6 +2526,10 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 	int i, ret;
 	struct clk_core *core;
+	if (hw->init->ops->enable && !hw->init->ops->is_enabled)
+		pr_warn("Warning: %s %s must implement .is_enabled\n",
+			__func__, hw->init->name);
 	core = kzalloc(sizeof(*core), GFP_KERNEL);
 	if (!core) {
 		ret = -ENOMEM;

             reply	other threads:[~2016-04-22  2:32 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-22  2:32 Jun Nie [this message]
2016-04-22 22:36 ` [PATCH] clk: Add is_enabled sanity check Stephen Boyd
2016-04-25  6:48   ` Jun Nie

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