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- /* SPDX-License-Identifier: GPL-2.0+ */
- /*
- * Copyright (c) 2015 Google, Inc
- * Written by Simon Glass <sjg@chromium.org>
- * Copyright (c) 2016, NVIDIA CORPORATION.
- */
- #ifndef _CLK_H_
- #define _CLK_H_
- #include <linux/errno.h>
- #include <linux/types.h>
- /**
- * A clock is a hardware signal that oscillates autonomously at a specific
- * frequency and duty cycle. Most hardware modules require one or more clock
- * signal to drive their operation. Clock signals are typically generated
- * externally to the HW module consuming them, by an entity this API calls a
- * clock provider. This API provides a standard means for drivers to enable and
- * disable clocks, and to set the rate at which they oscillate.
- *
- * A driver that implements UCLASS_CLOCK is a clock provider. A provider will
- * often implement multiple separate clocks, since the hardware it manages
- * often has this capability. clock_uclass.h describes the interface which
- * clock providers must implement.
- *
- * Clock consumers/clients are the HW modules driven by the clock signals. This
- * header file describes the API used by drivers for those HW modules.
- */
- struct udevice;
- /**
- * struct clk - A handle to (allowing control of) a single clock.
- *
- * Clients provide storage for clock handles. The content of the structure is
- * managed solely by the clock API and clock drivers. A clock struct is
- * initialized by "get"ing the clock struct. The clock struct is passed to all
- * other clock APIs to identify which clock signal to operate upon.
- *
- * @dev: The device which implements the clock signal.
- * @id: The clock signal ID within the provider.
- *
- * Currently, the clock API assumes that a single integer ID is enough to
- * identify and configure any clock signal for any clock provider. If this
- * assumption becomes invalid in the future, the struct could be expanded to
- * either (a) add more fields to allow clock providers to store additional
- * information, or (b) replace the id field with an opaque pointer, which the
- * provider would dynamically allocated during its .of_xlate op, and process
- * during is .request op. This may require the addition of an extra op to clean
- * up the allocation.
- */
- struct clk {
- struct udevice *dev;
- /*
- * Written by of_xlate. We assume a single id is enough for now. In the
- * future, we might add more fields here.
- */
- unsigned long id;
- };
- /**
- * struct clk_bulk - A handle to (allowing control of) a bulk of clocks.
- *
- * Clients provide storage for the clock bulk. The content of the structure is
- * managed solely by the clock API. A clock bulk struct is
- * initialized by "get"ing the clock bulk struct.
- * The clock bulk struct is passed to all other bulk clock APIs to apply
- * the API to all the clock in the bulk struct.
- *
- * @clks: An array of clock handles.
- * @count: The number of clock handles in the clks array.
- */
- struct clk_bulk {
- struct clk *clks;
- unsigned int count;
- };
- #if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(CLK)
- struct phandle_1_arg;
- int clk_get_by_index_platdata(struct udevice *dev, int index,
- struct phandle_1_arg *cells, struct clk *clk);
- /**
- * clock_get_by_index - Get/request a clock by integer index.
- *
- * This looks up and requests a clock. The index is relative to the client
- * device; each device is assumed to have n clocks associated with it somehow,
- * and this function finds and requests one of them. The mapping of client
- * device clock indices to provider clocks may be via device-tree properties,
- * board-provided mapping tables, or some other mechanism.
- *
- * @dev: The client device.
- * @index: The index of the clock to request, within the client's list of
- * clocks.
- * @clock A pointer to a clock struct to initialize.
- * @return 0 if OK, or a negative error code.
- */
- int clk_get_by_index(struct udevice *dev, int index, struct clk *clk);
- /**
- * clock_get_bulk - Get/request all clocks of a device.
- *
- * This looks up and requests all clocks of the client device; each device is
- * assumed to have n clocks associated with it somehow, and this function finds
- * and requests all of them in a separate structure. The mapping of client
- * device clock indices to provider clocks may be via device-tree properties,
- * board-provided mapping tables, or some other mechanism.
- *
- * @dev: The client device.
- * @bulk A pointer to a clock bulk struct to initialize.
- * @return 0 if OK, or a negative error code.
- */
- int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk);
- /**
- * clock_get_by_name - Get/request a clock by name.
- *
- * This looks up and requests a clock. The name is relative to the client
- * device; each device is assumed to have n clocks associated with it somehow,
- * and this function finds and requests one of them. The mapping of client
- * device clock names to provider clocks may be via device-tree properties,
- * board-provided mapping tables, or some other mechanism.
- *
- * @dev: The client device.
- * @name: The name of the clock to request, within the client's list of
- * clocks.
- * @clock: A pointer to a clock struct to initialize.
- * @return 0 if OK, or a negative error code.
- */
- int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk);
- /**
- * clk_release_all() - Disable (turn off)/Free an array of previously
- * requested clocks.
- *
- * For each clock contained in the clock array, this function will check if
- * clock has been previously requested and then will disable and free it.
- *
- * @clk: A clock struct array that was previously successfully
- * requested by clk_request/get_by_*().
- * @count Number of clock contained in the array
- * @return zero on success, or -ve error code.
- */
- int clk_release_all(struct clk *clk, int count);
- #else
- static inline int clk_get_by_index(struct udevice *dev, int index,
- struct clk *clk)
- {
- return -ENOSYS;
- }
- static inline int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
- {
- return -ENOSYS;
- }
- static inline int clk_get_by_name(struct udevice *dev, const char *name,
- struct clk *clk)
- {
- return -ENOSYS;
- }
- static inline int clk_release_all(struct clk *clk, int count)
- {
- return -ENOSYS;
- }
- #endif
- #if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \
- CONFIG_IS_ENABLED(CLK)
- /**
- * clk_set_defaults - Process 'assigned-{clocks/clock-parents/clock-rates}'
- * properties to configure clocks
- *
- * @dev: A device to process (the ofnode associated with this device
- * will be processed).
- */
- int clk_set_defaults(struct udevice *dev);
- #else
- static inline int clk_set_defaults(struct udevice *dev)
- {
- return 0;
- }
- #endif
- /**
- * clk_release_bulk() - Disable (turn off)/Free an array of previously
- * requested clocks in a clock bulk struct.
- *
- * For each clock contained in the clock bulk struct, this function will check
- * if clock has been previously requested and then will disable and free it.
- *
- * @clk: A clock bulk struct that was previously successfully
- * requested by clk_get_bulk().
- * @return zero on success, or -ve error code.
- */
- static inline int clk_release_bulk(struct clk_bulk *bulk)
- {
- return clk_release_all(bulk->clks, bulk->count);
- }
- /**
- * clk_request - Request a clock by provider-specific ID.
- *
- * This requests a clock using a provider-specific ID. Generally, this function
- * should not be used, since clk_get_by_index/name() provide an interface that
- * better separates clients from intimate knowledge of clock providers.
- * However, this function may be useful in core SoC-specific code.
- *
- * @dev: The clock provider device.
- * @clock: A pointer to a clock struct to initialize. The caller must
- * have already initialized any field in this struct which the
- * clock provider uses to identify the clock.
- * @return 0 if OK, or a negative error code.
- */
- int clk_request(struct udevice *dev, struct clk *clk);
- /**
- * clock_free - Free a previously requested clock.
- *
- * @clock: A clock struct that was previously successfully requested by
- * clk_request/get_by_*().
- * @return 0 if OK, or a negative error code.
- */
- int clk_free(struct clk *clk);
- /**
- * clk_get_rate() - Get current clock rate.
- *
- * @clk: A clock struct that was previously successfully requested by
- * clk_request/get_by_*().
- * @return clock rate in Hz, or -ve error code.
- */
- ulong clk_get_rate(struct clk *clk);
- /**
- * clk_set_rate() - Set current clock rate.
- *
- * @clk: A clock struct that was previously successfully requested by
- * clk_request/get_by_*().
- * @rate: New clock rate in Hz.
- * @return new rate, or -ve error code.
- */
- ulong clk_set_rate(struct clk *clk, ulong rate);
- /**
- * clk_set_parent() - Set current clock parent.
- *
- * @clk: A clock struct that was previously successfully requested by
- * clk_request/get_by_*().
- * @parent: A clock struct that was previously successfully requested by
- * clk_request/get_by_*().
- * @return new rate, or -ve error code.
- */
- int clk_set_parent(struct clk *clk, struct clk *parent);
- /**
- * clk_enable() - Enable (turn on) a clock.
- *
- * @clk: A clock struct that was previously successfully requested by
- * clk_request/get_by_*().
- * @return zero on success, or -ve error code.
- */
- int clk_enable(struct clk *clk);
- /**
- * clk_enable_bulk() - Enable (turn on) all clocks in a clock bulk struct.
- *
- * @bulk: A clock bulk struct that was previously successfully requested
- * by clk_get_bulk().
- * @return zero on success, or -ve error code.
- */
- int clk_enable_bulk(struct clk_bulk *bulk);
- /**
- * clk_disable() - Disable (turn off) a clock.
- *
- * @clk: A clock struct that was previously successfully requested by
- * clk_request/get_by_*().
- * @return zero on success, or -ve error code.
- */
- int clk_disable(struct clk *clk);
- /**
- * clk_disable_bulk() - Disable (turn off) all clocks in a clock bulk struct.
- *
- * @bulk: A clock bulk struct that was previously successfully requested
- * by clk_get_bulk().
- * @return zero on success, or -ve error code.
- */
- int clk_disable_bulk(struct clk_bulk *bulk);
- int soc_clk_dump(void);
- #endif
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