// SPDX-License-Identifier: GPL-2.0-only /* * drivers/clk/clkdev.c * * Copyright (C) 2008 Russell King. * * Helper for the clk API to assist looking up a struct clk. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/device.h> #include <linux/list.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/string.h> #include <linux/mutex.h> #include <linux/clk.h> #include <linux/clkdev.h> #include <linux/clk-provider.h> #include <linux/of.h> #include "clk.h" static LIST_HEAD(clocks); static DEFINE_MUTEX(clocks_mutex); /* * Find the correct struct clk for the device and connection ID. * We do slightly fuzzy matching here: * An entry with a NULL ID is assumed to be a wildcard. * If an entry has a device ID, it must match * If an entry has a connection ID, it must match * Then we take the most specific entry - with the following * order of precedence: dev+con > dev only > con only. */ static struct clk_lookup *clk_find(const char *dev_id, const char *con_id) { … } struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id) { … } static struct clk *__clk_get_sys(struct device *dev, const char *dev_id, const char *con_id) { … } struct clk *clk_get_sys(const char *dev_id, const char *con_id) { … } EXPORT_SYMBOL(…); struct clk *clk_get(struct device *dev, const char *con_id) { … } EXPORT_SYMBOL(…); void clk_put(struct clk *clk) { … } EXPORT_SYMBOL(…); static void __clkdev_add(struct clk_lookup *cl) { … } void clkdev_add(struct clk_lookup *cl) { … } EXPORT_SYMBOL(…); void clkdev_add_table(struct clk_lookup *cl, size_t num) { … } #define MAX_DEV_ID … #define MAX_CON_ID … struct clk_lookup_alloc { … }; static struct clk_lookup * __ref vclkdev_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt, va_list ap) { … } static struct clk_lookup * vclkdev_create(struct clk_hw *hw, const char *con_id, const char *dev_fmt, va_list ap) { … } /** * clkdev_create - allocate and add a clkdev lookup structure * @clk: struct clk to associate with all clk_lookups * @con_id: connection ID string on device * @dev_fmt: format string describing device name * * Returns a clk_lookup structure, which can be later unregistered and * freed. */ struct clk_lookup *clkdev_create(struct clk *clk, const char *con_id, const char *dev_fmt, ...) { … } EXPORT_SYMBOL_GPL(…); /** * clkdev_hw_create - allocate and add a clkdev lookup structure * @hw: struct clk_hw to associate with all clk_lookups * @con_id: connection ID string on device * @dev_fmt: format string describing device name * * Returns a clk_lookup structure, which can be later unregistered and * freed. */ struct clk_lookup *clkdev_hw_create(struct clk_hw *hw, const char *con_id, const char *dev_fmt, ...) { … } EXPORT_SYMBOL_GPL(…); int clk_add_alias(const char *alias, const char *alias_dev_name, const char *con_id, struct device *dev) { … } EXPORT_SYMBOL(…); /* * clkdev_drop - remove a clock dynamically allocated */ void clkdev_drop(struct clk_lookup *cl) { … } EXPORT_SYMBOL(…); static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw, const char *con_id, const char *dev_id, ...) { … } static int do_clk_register_clkdev(struct clk_hw *hw, struct clk_lookup **cl, const char *con_id, const char *dev_id) { … } /** * 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: 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_id) { … } EXPORT_SYMBOL(…); /** * clk_hw_register_clkdev - register one clock lookup for a struct clk_hw * @hw: struct clk_hw 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 clk_hws * from a previous clk_hw_register_*() call, and return the error code for * those. This is to permit this function to be called immediately * after clk_hw_register_*(). */ int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id, const char *dev_id) { … } EXPORT_SYMBOL(…); static void devm_clkdev_release(void *res) { … } /** * devm_clk_hw_register_clkdev - managed clk lookup registration for clk_hw * @dev: device this lookup is bound * @hw: struct clk_hw 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 clk_hws * from a previous clk_hw_register_*() call, and return the error code for * those. This is to permit this function to be called immediately * after clk_hw_register_*(). */ int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw, const char *con_id, const char *dev_id) { … } EXPORT_SYMBOL(…);