[RFC, PATCH 3/3] clk: add warnings for incorrect enable/prepare semantics

This change adds warnings to check for:

?1) enabling a clock that hasn't been prepared; and

?2) unpreparing a clock that is still enabled

While the correctness can't be guaranteed, these warnings should cover
most situations.

Signed-off-by: Jeremy Kerr <redacted>

---
?drivers/clk/clk.c | ? ?4 ++++
?1 file changed, 4 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 51dbd33..2369959 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c

@@ -35,6 +35,8 @@ void clk_unprepare(struct clk *clk)

? ? ? ?if (!clk->ops->unprepare)
? ? ? ? ? ? ? ?return;

+ ? ? ? WARN_ON(clk->enable_count);
+
? ? ? ?mutex_lock(&clk->prepare_lock);
? ? ? ?if (--clk->prepare_count == 0)
? ? ? ? ? ? ? ?clk->ops->unprepare(clk);

@@ -50,6 +52,8 @@ int clk_enable(struct clk *clk)

? ? ? ?if (!clk->ops->enable)
? ? ? ? ? ? ? ?return 0;

+ ? ? ? WARN_ON(clk->ops->prepare && clk->prepare_count);
+