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>
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3a3d2b0551
Коммит
ac2df527fb
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@ -14,12 +14,14 @@
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#include <linux/slab.h>
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#ifndef CONFIG_COMMON_CLK
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#ifdef CONFIG_HAVE_MACH_CLKDEV
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#include <mach/clkdev.h>
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#else
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#define __clk_get(clk) ({ 1; })
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#define __clk_put(clk) do { } while (0)
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#endif
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#endif
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static inline struct clk_lookup_alloc *__clkdev_alloc(size_t size)
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{
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@ -8,7 +8,9 @@ static inline struct clk_lookup_alloc *__clkdev_alloc(size_t size)
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return kzalloc(size, GFP_KERNEL);
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}
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#ifndef CONFIG_COMMON_CLK
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#define __clk_put(clk)
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#define __clk_get(clk) ({ 1; })
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#endif
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#endif
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@ -14,8 +14,10 @@
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#include <linux/slab.h>
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#ifndef CONFIG_COMMON_CLK
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#define __clk_get(clk) ({ 1; })
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#define __clk_put(clk) do { } while (0)
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#endif
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static inline struct clk_lookup_alloc *__clkdev_alloc(size_t size)
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{
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@ -25,7 +25,9 @@ static inline struct clk_lookup_alloc *__clkdev_alloc(size_t size)
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return kzalloc(size, GFP_KERNEL);
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}
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#ifndef CONFIG_COMMON_CLK
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#define __clk_put(clk)
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#define __clk_get(clk) ({ 1; })
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#endif
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#endif /* __CLKDEV_H__ */
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@ -1813,6 +1813,10 @@ struct clk *__clk_register(struct device *dev, struct clk_hw *hw)
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clk->flags = hw->init->flags;
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clk->parent_names = hw->init->parent_names;
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clk->num_parents = hw->init->num_parents;
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if (dev && dev->driver)
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clk->owner = dev->driver->owner;
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else
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clk->owner = NULL;
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ret = __clk_init(dev, clk);
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if (ret)
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@ -1833,6 +1837,8 @@ static int _clk_register(struct device *dev, struct clk_hw *hw, struct clk *clk)
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goto fail_name;
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}
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clk->ops = hw->init->ops;
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if (dev && dev->driver)
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clk->owner = dev->driver->owner;
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clk->hw = hw;
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clk->flags = hw->init->flags;
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clk->num_parents = hw->init->num_parents;
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@ -1973,6 +1979,26 @@ void devm_clk_unregister(struct device *dev, struct clk *clk)
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}
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EXPORT_SYMBOL_GPL(devm_clk_unregister);
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/*
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* clkdev helpers
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*/
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int __clk_get(struct clk *clk)
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{
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if (clk && !try_module_get(clk->owner))
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return 0;
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return 1;
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}
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void __clk_put(struct clk *clk)
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{
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if (WARN_ON_ONCE(IS_ERR(clk)))
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return;
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if (clk)
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module_put(clk->owner);
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}
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/*** clk rate change notifiers ***/
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/**
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@ -25,10 +25,13 @@
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#ifdef CONFIG_COMMON_CLK
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struct module;
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struct clk {
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const char *name;
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const struct clk_ops *ops;
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struct clk_hw *hw;
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struct module *owner;
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struct clk *parent;
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const char **parent_names;
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struct clk **parents;
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@ -43,4 +43,9 @@ int clk_add_alias(const char *, const char *, char *, struct device *);
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int clk_register_clkdev(struct clk *, const char *, const char *, ...);
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int clk_register_clkdevs(struct clk *, struct clk_lookup *, size_t);
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#ifdef CONFIG_COMMON_CLK
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int __clk_get(struct clk *clk);
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void __clk_put(struct clk *clk);
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#endif
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#endif
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