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| author | Sylwester Nawrocki <s.nawrocki@samsung.com> | 2013-08-24 20:10:41 +0200 |
|---|---|---|
| committer | Sylwester Nawrocki <s.nawrocki@samsung.com> | 2013-12-04 17:19:44 +0100 |
| commit | ac2df527fb407b61f9c812a99035b62a75a77d6d (patch) | |
| tree | 87b9b90703c654b5359749bd48eb87bb5dd0b118 /drivers/clk/clk.c | |
| parent | 3a3d2b0551d79ef476ef57424beeb8f68789fbcd (diff) | |
| download | linux-stable-ac2df527fb407b61f9c812a99035b62a75a77d6d.tar.gz linux-stable-ac2df527fb407b61f9c812a99035b62a75a77d6d.tar.bz2 linux-stable-ac2df527fb407b61f9c812a99035b62a75a77d6d.zip | |
clk: Add common __clk_get(), __clk_put() implementations
This patch adds common __clk_get(), __clk_put() clkdev helpers that
replace their platform specific counterparts when the common clock
API is used.
The owner module pointer field is added to struct clk so a reference
to the clock supplier module can be taken by the clock consumers.
The owner module is assigned while the clock is being registered,
in functions _clk_register() and __clk_register().
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/clk/clk.c')
| -rw-r--r-- | drivers/clk/clk.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index c687dc8d0b64..baa2f66a7d19 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -1813,6 +1813,10 @@ struct clk *__clk_register(struct device *dev, struct clk_hw *hw) clk->flags = hw->init->flags; clk->parent_names = hw->init->parent_names; clk->num_parents = hw->init->num_parents; + if (dev && dev->driver) + clk->owner = dev->driver->owner; + else + clk->owner = NULL; ret = __clk_init(dev, clk); if (ret) @@ -1833,6 +1837,8 @@ static int _clk_register(struct device *dev, struct clk_hw *hw, struct clk *clk) goto fail_name; } clk->ops = hw->init->ops; + if (dev && dev->driver) + clk->owner = dev->driver->owner; clk->hw = hw; clk->flags = hw->init->flags; clk->num_parents = hw->init->num_parents; @@ -1973,6 +1979,26 @@ void devm_clk_unregister(struct device *dev, struct clk *clk) } EXPORT_SYMBOL_GPL(devm_clk_unregister); +/* + * clkdev helpers + */ +int __clk_get(struct clk *clk) +{ + if (clk && !try_module_get(clk->owner)) + return 0; + + return 1; +} + +void __clk_put(struct clk *clk) +{ + if (WARN_ON_ONCE(IS_ERR(clk))) + return; + + if (clk) + module_put(clk->owner); +} + /*** clk rate change notifiers ***/ /** |