Merge branch 'depends/rmk/clkdev' into next/clock (e12ff344) · Commits · EulixOS / Software / Kernel

Documentation/driver-model/devres.txt

+4 −0

Original line number	Diff line number	Diff line
		@@ -276,3 +276,7 @@ REGULATOR
		devm_regulator_get()
		devm_regulator_put()
		devm_regulator_bulk_get()

		CLOCK
		devm_clk_get()
		devm_clk_put()

drivers/clk/clkdev.c

+132 −10

Original line number	Diff line number	Diff line
		@@ -35,7 +35,12 @@ static DEFINE_MUTEX(clocks_mutex);
		static struct clk_lookup clk_find(const char dev_id, const char *con_id)
		{
		struct clk_lookup p, cl = NULL;
		int match, best = 0;
		int match, best_found = 0, best_possible = 0;

		if (dev_id)
		best_possible += 2;
		if (con_id)
		best_possible += 1;

		list_for_each_entry(p, &clocks, node) {
		match = 0;
		@@ -50,10 +55,10 @@ static struct clk_lookup clk_find(const char dev_id, const char *con_id)
		match += 1;
		}

		if (match > best) {
		if (match > best_found) {
		cl = p;
		if (match != 3)
		best = match;
		if (match != best_possible)
		best_found = match;
		else
		break;
		}
		@@ -89,6 +94,51 @@ void clk_put(struct clk *clk)
		}
		EXPORT_SYMBOL(clk_put);

		static void devm_clk_release(struct device dev, void res)
		{
		clk_put((struct clk *)res);
		}

		struct clk devm_clk_get(struct device dev, const char *id)
		{
		struct clk *ptr, clk;

		ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
		if (!ptr)
		return ERR_PTR(-ENOMEM);

		clk = clk_get(dev, id);
		if (!IS_ERR(clk)) {
		*ptr = clk;
		devres_add(dev, ptr);
		} else {
		devres_free(ptr);
		}

		return clk;
		}
		EXPORT_SYMBOL(devm_clk_get);

		static int devm_clk_match(struct device dev, void res, void *data)
		{
		struct clk **c = res;
		if (!c \|\| !*c) {
		WARN_ON(!c \|\| !*c);
		return 0;
		}
		return *c == data;
		}

		void devm_clk_put(struct device dev, struct clk clk)
		{
		int ret;

		ret = devres_destroy(dev, devm_clk_release, devm_clk_match, clk);

		WARN_ON(ret);
		}
		EXPORT_SYMBOL(devm_clk_put);

		void clkdev_add(struct clk_lookup *cl)
		{
		mutex_lock(&clocks_mutex);
		@@ -116,8 +166,9 @@ struct clk_lookup_alloc {
		char con_id[MAX_CON_ID];
		};

		struct clk_lookup * __init_refok
		clkdev_alloc(struct clk clk, const char con_id, const char *dev_fmt, ...)
		static struct clk_lookup * __init_refok
		vclkdev_alloc(struct clk clk, const char con_id, const char *dev_fmt,
		va_list ap)
		{
		struct clk_lookup_alloc *cla;

		@@ -132,16 +183,25 @@ clkdev_alloc(struct clk clk, const char con_id, const char *dev_fmt, ...)
		}

		if (dev_fmt) {
		va_list ap;

		va_start(ap, dev_fmt);
		vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
		cla->cl.dev_id = cla->dev_id;
		va_end(ap);
		}

		return &cla->cl;
		}

		struct clk_lookup * __init_refok
		clkdev_alloc(struct clk clk, const char con_id, const char *dev_fmt, ...)
		{
		struct clk_lookup *cl;
		va_list ap;

		va_start(ap, dev_fmt);
		cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
		va_end(ap);

		return cl;
		}
		EXPORT_SYMBOL(clkdev_alloc);

		int clk_add_alias(const char alias, const char alias_dev_name, char *id,
		@@ -173,3 +233,65 @@ void clkdev_drop(struct clk_lookup *cl)
		kfree(cl);
		}
		EXPORT_SYMBOL(clkdev_drop);

		/**
		* clk_register_clkdev - register one clock lookup for a struct clk
		* @clk: struct clk to associate with all clk_lookups
		* @con_id: connection ID string on device
		* @dev_id: format string describing device name
		*
		* con_id or dev_id may be NULL as a wildcard, just as in the rest of
		* clkdev.
		*
		* To make things easier for mass registration, we detect error clks
		* from a previous clk_register() call, and return the error code for
		* those. This is to permit this function to be called immediately
		* after clk_register().
		*/
		int clk_register_clkdev(struct clk clk, const char con_id,
		const char *dev_fmt, ...)
		{
		struct clk_lookup *cl;
		va_list ap;

		if (IS_ERR(clk))
		return PTR_ERR(clk);

		va_start(ap, dev_fmt);
		cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
		va_end(ap);

		if (!cl)
		return -ENOMEM;

		clkdev_add(cl);

		return 0;
		}

		/**
		* clk_register_clkdevs - register a set of clk_lookup for a struct clk
		* @clk: struct clk to associate with all clk_lookups
		* @cl: array of clk_lookup structures with con_id and dev_id pre-initialized
		* @num: number of clk_lookup structures to register
		*
		* To make things easier for mass registration, we detect error clks
		* from a previous clk_register() call, and return the error code for
		* those. This is to permit this function to be called immediately
		* after clk_register().
		*/
		int clk_register_clkdevs(struct clk clk, struct clk_lookup cl, size_t num)
		{
		unsigned i;

		if (IS_ERR(clk))
		return PTR_ERR(clk);

		for (i = 0; i < num; i++, cl++) {
		cl->clk = clk;
		clkdev_add(cl);
		}

		return 0;
		}
		EXPORT_SYMBOL(clk_register_clkdevs);

include/linux/clk.h

+32 −0

Original line number	Diff line number	Diff line
		@@ -100,6 +100,26 @@ int clk_notifier_unregister(struct clk clk, struct notifier_block nb);
		*/
		struct clk clk_get(struct device dev, const char *id);

		/**
		* devm_clk_get - lookup and obtain a managed reference to a clock producer.
		* @dev: device for clock "consumer"
		* @id: clock comsumer ID
		*
		* Returns a struct clk corresponding to the clock producer, or
		* valid IS_ERR() condition containing errno. The implementation
		* uses @dev and @id to determine the clock consumer, and thereby
		* the clock producer. (IOW, @id may be identical strings, but
		* clk_get may return different clock producers depending on @dev.)
		*
		* Drivers must assume that the clock source is not enabled.
		*
		* devm_clk_get should not be called from within interrupt context.
		*
		* The clock will automatically be freed when the device is unbound
		* from the bus.
		*/
		struct clk devm_clk_get(struct device dev, const char *id);

		/**
		* clk_prepare - prepare a clock source
		* @clk: clock source
		@@ -206,6 +226,18 @@ unsigned long clk_get_rate(struct clk *clk);
		*/
		void clk_put(struct clk *clk);

		/**
		* devm_clk_put - "free" a managed clock source
		* @dev: device used to acuqire the clock
		* @clk: clock source acquired with devm_clk_get()
		*
		* Note: drivers must ensure that all clk_enable calls made on this
		* clock source are balanced by clk_disable calls prior to calling
		* this function.
		*
		* clk_put should not be called from within interrupt context.
		*/
		void devm_clk_put(struct device dev, struct clk clk);

		/*
		* The remaining APIs are optional for machine class support.

include/linux/clkdev.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -40,4 +40,7 @@ void clkdev_drop(struct clk_lookup *cl);
		void clkdev_add_table(struct clk_lookup *, size_t);
		int clk_add_alias(const char , const char , char , struct device );

		int clk_register_clkdev(struct clk , const char , const char *, ...);
		int clk_register_clkdevs(struct clk , struct clk_lookup , size_t);

		#endif