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![Jean-Jacques Hiblot](/assets/img/avatar_default.png)
This fixes the case where assigned-clocks is used to define a clock defaults inside this same clock's node. This is used sometimes to setup a default parents and/or rate for a clock. example: muxed_clock: muxed_clock { clocks = <&clk_provider 0>, <&clk_provider 1>; #clock-cells = <0>; assigned-clocks = <&muxed_clock>; assigned-clock-parents = <&clk_provider 1>; }; It doesn't work in u-boot because the assigned-clocks are setup *before* the clock is probed. (clk_set_parent() will likely crash or fail if called before the device probe function) Making it work by handling "assigned-clocks" in 2 steps: first before the clk device is probed, and then after the clk device is probed. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
432 lines
14 KiB
C
432 lines
14 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*/
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#ifndef _CLK_H_
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#define _CLK_H_
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#include <dm/ofnode.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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/**
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* A clock is a hardware signal that oscillates autonomously at a specific
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* frequency and duty cycle. Most hardware modules require one or more clock
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* signal to drive their operation. Clock signals are typically generated
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* externally to the HW module consuming them, by an entity this API calls a
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* clock provider. This API provides a standard means for drivers to enable and
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* disable clocks, and to set the rate at which they oscillate.
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*
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* A driver that implements UCLASS_CLK is a clock provider. A provider will
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* often implement multiple separate clocks, since the hardware it manages
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* often has this capability. clk-uclass.h describes the interface which
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* clock providers must implement.
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*
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* Clock consumers/clients are the HW modules driven by the clock signals. This
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* header file describes the API used by drivers for those HW modules.
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*/
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struct udevice;
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/**
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* struct clk - A handle to (allowing control of) a single clock.
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*
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* Clients provide storage for clock handles. The content of the structure is
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* managed solely by the clock API and clock drivers. A clock struct is
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* initialized by "get"ing the clock struct. The clock struct is passed to all
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* other clock APIs to identify which clock signal to operate upon.
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*
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* @dev: The device which implements the clock signal.
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* @rate: The clock rate (in HZ).
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* @flags: Flags used across common clock structure (e.g. CLK_)
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* Clock IP blocks specific flags (i.e. mux, div, gate, etc) are defined
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* in struct's for those devices (e.g. struct clk_mux).
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* @id: The clock signal ID within the provider.
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* @data: An optional data field for scenarios where a single integer ID is not
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* sufficient. If used, it can be populated through an .of_xlate op and
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* processed during the various clock ops.
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*
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* Should additional information to identify and configure any clock signal
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* for any provider be required in the future, the struct could be expanded to
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* either (a) add more fields to allow clock providers to store additional
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* information, or (b) replace the id field with an opaque pointer, which the
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* provider would dynamically allocated during its .of_xlate op, and process
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* during is .request op. This may require the addition of an extra op to clean
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* up the allocation.
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*/
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struct clk {
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struct udevice *dev;
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long long rate; /* in HZ */
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u32 flags;
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int enable_count;
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/*
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* Written by of_xlate. In the future, we might add more fields here.
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*/
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unsigned long id;
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unsigned long data;
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};
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/**
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* struct clk_bulk - A handle to (allowing control of) a bulk of clocks.
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*
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* Clients provide storage for the clock bulk. The content of the structure is
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* managed solely by the clock API. A clock bulk struct is
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* initialized by "get"ing the clock bulk struct.
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* The clock bulk struct is passed to all other bulk clock APIs to apply
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* the API to all the clock in the bulk struct.
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*
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* @clks: An array of clock handles.
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* @count: The number of clock handles in the clks array.
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*/
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struct clk_bulk {
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struct clk *clks;
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unsigned int count;
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};
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#if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(CLK)
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struct phandle_1_arg;
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int clk_get_by_index_platdata(struct udevice *dev, int index,
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struct phandle_1_arg *cells, struct clk *clk);
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/**
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* clock_get_by_index - Get/request a clock by integer index.
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*
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* This looks up and requests a clock. The index is relative to the client
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* device; each device is assumed to have n clocks associated with it somehow,
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* and this function finds and requests one of them. The mapping of client
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* device clock indices to provider clocks may be via device-tree properties,
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* board-provided mapping tables, or some other mechanism.
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*
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* @dev: The client device.
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* @index: The index of the clock to request, within the client's list of
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* clocks.
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* @clock A pointer to a clock struct to initialize.
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* @return 0 if OK, or a negative error code.
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*/
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int clk_get_by_index(struct udevice *dev, int index, struct clk *clk);
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/**
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* clock_get_by_index_nodev - Get/request a clock by integer index
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* without a device.
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*
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* This is a version of clk_get_by_index() that does not use a device.
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*
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* @node: The client ofnode.
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* @index: The index of the clock to request, within the client's list of
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* clocks.
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* @clock A pointer to a clock struct to initialize.
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* @return 0 if OK, or a negative error code.
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*/
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int clk_get_by_index_nodev(ofnode node, int index, struct clk *clk);
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/**
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* clock_get_bulk - Get/request all clocks of a device.
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*
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* This looks up and requests all clocks of the client device; each device is
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* assumed to have n clocks associated with it somehow, and this function finds
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* and requests all of them in a separate structure. The mapping of client
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* device clock indices to provider clocks may be via device-tree properties,
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* board-provided mapping tables, or some other mechanism.
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*
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* @dev: The client device.
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* @bulk A pointer to a clock bulk struct to initialize.
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* @return 0 if OK, or a negative error code.
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*/
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int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk);
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/**
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* clock_get_by_name - Get/request a clock by name.
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*
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* This looks up and requests a clock. The name is relative to the client
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* device; each device is assumed to have n clocks associated with it somehow,
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* and this function finds and requests one of them. The mapping of client
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* device clock names to provider clocks may be via device-tree properties,
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* board-provided mapping tables, or some other mechanism.
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*
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* @dev: The client device.
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* @name: The name of the clock to request, within the client's list of
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* clocks.
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* @clock: A pointer to a clock struct to initialize.
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* @return 0 if OK, or a negative error code.
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*/
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int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk);
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/**
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* devm_clk_get - lookup and obtain a managed reference to a clock producer.
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* @dev: device for clock "consumer"
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* @id: clock consumer ID
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*
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* Returns a struct clk corresponding to the clock producer, or
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* valid IS_ERR() condition containing errno. The implementation
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* uses @dev and @id to determine the clock consumer, and thereby
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* the clock producer. (IOW, @id may be identical strings, but
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* clk_get may return different clock producers depending on @dev.)
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*
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* Drivers must assume that the clock source is not enabled.
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*
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* devm_clk_get should not be called from within interrupt context.
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*
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* The clock will automatically be freed when the device is unbound
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* from the bus.
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*/
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struct clk *devm_clk_get(struct udevice *dev, const char *id);
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/**
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* devm_clk_get_optional - lookup and obtain a managed reference to an optional
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* clock producer.
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* @dev: device for clock "consumer"
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* @id: clock consumer ID
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*
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* Behaves the same as devm_clk_get() except where there is no clock producer.
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* In this case, instead of returning -ENOENT, the function returns NULL.
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*/
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struct clk *devm_clk_get_optional(struct udevice *dev, const char *id);
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/**
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* clk_release_all() - Disable (turn off)/Free an array of previously
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* requested clocks.
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*
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* For each clock contained in the clock array, this function will check if
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* clock has been previously requested and then will disable and free it.
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*
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* @clk: A clock struct array that was previously successfully
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* requested by clk_request/get_by_*().
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* @count Number of clock contained in the array
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* @return zero on success, or -ve error code.
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*/
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int clk_release_all(struct clk *clk, int count);
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/**
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* devm_clk_put - "free" a managed clock source
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* @dev: device used to acquire the clock
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* @clk: clock source acquired with devm_clk_get()
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*
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* Note: drivers must ensure that all clk_enable calls made on this
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* clock source are balanced by clk_disable calls prior to calling
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* this function.
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*
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* clk_put should not be called from within interrupt context.
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*/
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void devm_clk_put(struct udevice *dev, struct clk *clk);
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#else
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static inline int clk_get_by_index(struct udevice *dev, int index,
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struct clk *clk)
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{
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return -ENOSYS;
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}
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static inline int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
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{
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return -ENOSYS;
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}
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static inline int clk_get_by_name(struct udevice *dev, const char *name,
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struct clk *clk)
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{
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return -ENOSYS;
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}
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static inline int clk_release_all(struct clk *clk, int count)
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{
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return -ENOSYS;
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}
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#endif
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#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \
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CONFIG_IS_ENABLED(CLK)
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/**
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* clk_set_defaults - Process 'assigned-{clocks/clock-parents/clock-rates}'
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* properties to configure clocks
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*
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* @dev: A device to process (the ofnode associated with this device
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* will be processed).
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* @stage: A integer. 0 indicates that this is called before the device
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* is probed. 1 indicates that this is called just after the
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* device has been probed
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*/
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int clk_set_defaults(struct udevice *dev, int stage);
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#else
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static inline int clk_set_defaults(struct udevice *dev, int stage)
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{
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return 0;
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}
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#endif
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/**
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* clk_release_bulk() - Disable (turn off)/Free an array of previously
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* requested clocks in a clock bulk struct.
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*
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* For each clock contained in the clock bulk struct, this function will check
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* if clock has been previously requested and then will disable and free it.
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*
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* @clk: A clock bulk struct that was previously successfully
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* requested by clk_get_bulk().
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* @return zero on success, or -ve error code.
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*/
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static inline int clk_release_bulk(struct clk_bulk *bulk)
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{
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return clk_release_all(bulk->clks, bulk->count);
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}
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/**
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* clk_request - Request a clock by provider-specific ID.
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*
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* This requests a clock using a provider-specific ID. Generally, this function
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* should not be used, since clk_get_by_index/name() provide an interface that
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* better separates clients from intimate knowledge of clock providers.
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* However, this function may be useful in core SoC-specific code.
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*
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* @dev: The clock provider device.
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* @clock: A pointer to a clock struct to initialize. The caller must
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* have already initialized any field in this struct which the
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* clock provider uses to identify the clock.
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* @return 0 if OK, or a negative error code.
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*/
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int clk_request(struct udevice *dev, struct clk *clk);
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/**
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* clock_free - Free a previously requested clock.
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*
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* @clock: A clock struct that was previously successfully requested by
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* clk_request/get_by_*().
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* @return 0 if OK, or a negative error code.
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*/
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int clk_free(struct clk *clk);
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/**
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* clk_get_rate() - Get current clock rate.
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*
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* @clk: A clock struct that was previously successfully requested by
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* clk_request/get_by_*().
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* @return clock rate in Hz, or -ve error code.
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*/
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ulong clk_get_rate(struct clk *clk);
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/**
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* clk_get_parent() - Get current clock's parent.
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*
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* @clk: A clock struct that was previously successfully requested by
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* clk_request/get_by_*().
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* @return pointer to parent's struct clk, or error code passed as pointer
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*/
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struct clk *clk_get_parent(struct clk *clk);
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/**
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* clk_get_parent_rate() - Get parent of current clock rate.
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*
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* @clk: A clock struct that was previously successfully requested by
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* clk_request/get_by_*().
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* @return clock rate in Hz, or -ve error code.
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*/
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long long clk_get_parent_rate(struct clk *clk);
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/**
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* clk_set_rate() - Set current clock rate.
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*
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* @clk: A clock struct that was previously successfully requested by
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* clk_request/get_by_*().
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* @rate: New clock rate in Hz.
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* @return new rate, or -ve error code.
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*/
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ulong clk_set_rate(struct clk *clk, ulong rate);
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/**
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* clk_set_parent() - Set current clock parent.
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*
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* @clk: A clock struct that was previously successfully requested by
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* clk_request/get_by_*().
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* @parent: A clock struct that was previously successfully requested by
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* clk_request/get_by_*().
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* @return new rate, or -ve error code.
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*/
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int clk_set_parent(struct clk *clk, struct clk *parent);
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/**
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* clk_enable() - Enable (turn on) a clock.
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*
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* @clk: A clock struct that was previously successfully requested by
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* clk_request/get_by_*().
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* @return zero on success, or -ve error code.
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*/
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int clk_enable(struct clk *clk);
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/**
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* clk_enable_bulk() - Enable (turn on) all clocks in a clock bulk struct.
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*
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* @bulk: A clock bulk struct that was previously successfully requested
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* by clk_get_bulk().
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* @return zero on success, or -ve error code.
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*/
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int clk_enable_bulk(struct clk_bulk *bulk);
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/**
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* clk_disable() - Disable (turn off) a clock.
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*
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* @clk: A clock struct that was previously successfully requested by
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* clk_request/get_by_*().
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* @return zero on success, or -ve error code.
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*/
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int clk_disable(struct clk *clk);
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/**
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* clk_disable_bulk() - Disable (turn off) all clocks in a clock bulk struct.
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*
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* @bulk: A clock bulk struct that was previously successfully requested
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* by clk_get_bulk().
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* @return zero on success, or -ve error code.
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*/
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int clk_disable_bulk(struct clk_bulk *bulk);
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/**
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* clk_is_match - check if two clk's point to the same hardware clock
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* @p: clk compared against q
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* @q: clk compared against p
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*
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* Returns true if the two struct clk pointers both point to the same hardware
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* clock node.
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*
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* Returns false otherwise. Note that two NULL clks are treated as matching.
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*/
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bool clk_is_match(const struct clk *p, const struct clk *q);
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int soc_clk_dump(void);
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/**
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* clk_valid() - check if clk is valid
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*
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* @clk: the clock to check
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* @return true if valid, or false
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*/
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static inline bool clk_valid(struct clk *clk)
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{
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return clk && !!clk->dev;
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}
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/**
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* clk_get_by_id() - Get the clock by its ID
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*
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* @id: The clock ID to search for
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*
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* @clkp: A pointer to clock struct that has been found among added clocks
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* to UCLASS_CLK
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* @return zero on success, or -ENOENT on error
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*/
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int clk_get_by_id(ulong id, struct clk **clkp);
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/**
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* clk_dev_binded() - Check whether the clk has a device binded
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*
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* @clk A pointer to the clk
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*
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* @return true on binded, or false on no
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*/
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bool clk_dev_binded(struct clk *clk);
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#endif
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#define clk_prepare_enable(clk) clk_enable(clk)
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#define clk_disable_unprepare(clk) clk_disable(clk)
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