2018-05-06 21:58:06 +00:00
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/* SPDX-License-Identifier: GPL-2.0+ */
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2015-06-23 21:39:15 +00:00
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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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2016-06-17 15:44:00 +00:00
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* Copyright (c) 2016, NVIDIA CORPORATION.
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2015-06-23 21:39:15 +00:00
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*/
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2013-11-21 21:39:02 +00:00
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#ifndef _CLK_H_
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#define _CLK_H_
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2019-02-27 18:56:52 +00:00
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#include <dm/ofnode.h>
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2020-04-27 13:29:57 +00:00
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#include <linux/err.h>
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2016-09-21 02:28:55 +00:00
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#include <linux/errno.h>
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2016-01-13 04:16:09 +00:00
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#include <linux/types.h>
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2016-06-17 15:44:00 +00:00
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/**
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2021-12-22 17:11:12 +00:00
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* DOC: Overview
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*
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2016-06-17 15:44:00 +00:00
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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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2019-06-24 13:50:36 +00:00
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* A driver that implements UCLASS_CLK is a clock provider. A provider will
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2016-06-17 15:44:00 +00:00
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* often implement multiple separate clocks, since the hardware it manages
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2018-09-17 16:43:08 +00:00
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* often has this capability. clk-uclass.h describes the interface which
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2016-06-17 15:44:00 +00:00
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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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2016-01-13 04:16:09 +00:00
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2016-06-17 15:44:00 +00:00
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struct udevice;
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2013-11-21 21:39:02 +00:00
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2016-06-17 15:44:00 +00:00
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/**
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* struct clk - A handle to (allowing control of) a single clock.
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* @dev: The device which implements the clock signal.
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2019-06-24 13:50:38 +00:00
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* @rate: The clock rate (in HZ).
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2021-12-22 17:11:12 +00:00
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* @flags: Flags used across common clock structure (e.g. %CLK_)
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2019-06-24 13:50:39 +00:00
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* Clock IP blocks specific flags (i.e. mux, div, gate, etc) are defined
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2021-12-22 17:11:12 +00:00
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* in struct's for those devices (e.g. &struct clk_mux).
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* @enable_count: The number of times this clock has been enabled.
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2016-06-17 15:44:00 +00:00
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* @id: The clock signal ID within the provider.
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2018-08-27 10:27:42 +00:00
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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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2016-06-17 15:44:00 +00:00
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*
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2021-12-22 17:11:12 +00:00
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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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2018-08-27 10:27:42 +00:00
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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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2016-06-17 15:44:00 +00:00
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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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2019-06-24 13:50:38 +00:00
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long long rate; /* in HZ */
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2019-06-24 13:50:39 +00:00
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u32 flags;
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2019-08-21 13:35:03 +00:00
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int enable_count;
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2016-06-17 15:44:00 +00:00
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/*
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2018-08-27 10:27:42 +00:00
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* Written by of_xlate. In the future, we might add more fields here.
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2015-06-23 21:39:15 +00:00
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*/
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2016-06-17 15:44:00 +00:00
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unsigned long id;
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2018-08-27 10:27:42 +00:00
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unsigned long data;
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2015-06-23 21:39:15 +00:00
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};
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2018-04-03 09:44:18 +00:00
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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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2021-12-22 17:11:12 +00:00
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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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2018-04-03 09:44:18 +00:00
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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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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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2017-08-29 20:15:56 +00:00
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struct phandle_1_arg;
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2022-09-27 17:18:19 +00:00
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#if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(CLK)
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2021-08-07 13:24:09 +00:00
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/**
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* clk_get_by_phandle() - Get a clock by its phandle information (of-platadata)
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2021-12-22 17:11:12 +00:00
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* @dev: Device containing the phandle
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* @cells: Phandle info
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* @clk: A pointer to a clock struct to initialise
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2021-08-07 13:24:09 +00:00
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*
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* This function is used when of-platdata is enabled.
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*
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* This looks up a clock using the phandle info. With dtoc, each phandle in the
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2021-12-22 17:11:12 +00:00
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* 'clocks' property is transformed into an idx representing the device.
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* For example::
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2021-08-07 13:24:09 +00:00
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*
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* clocks = <&dpll_mpu_ck 23>;
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*
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2021-12-22 17:11:12 +00:00
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* might result in::
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2021-08-07 13:24:09 +00:00
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*
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* .clocks = {1, {23}},},
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*
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* indicating that the clock is udevice idx 1 in dt-plat.c with an argument of
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* 23. This function can return a valid clock given the above information. In
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* this example it would return a clock containing the 'dpll_mpu_ck' device and
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* the clock ID 23.
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*
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2022-01-19 17:05:50 +00:00
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* Return: 0 if OK, or a negative error code.
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2021-08-07 13:24:09 +00:00
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*/
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int clk_get_by_phandle(struct udevice *dev, const struct phandle_1_arg *cells,
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struct clk *clk);
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2016-07-04 17:58:03 +00:00
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2016-06-17 15:44:00 +00:00
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/**
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2021-08-07 13:24:09 +00:00
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* clk_get_by_index() - Get/request a clock by integer index.
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2021-12-22 17:11:12 +00:00
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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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* @clk: A pointer to a clock struct to initialize.
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2016-06-17 15:44:00 +00:00
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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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2022-01-19 17:05:50 +00:00
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* Return: 0 if OK, or a negative error code.
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2016-06-17 15:44:00 +00:00
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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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2015-06-23 21:39:15 +00:00
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2019-02-27 18:56:52 +00:00
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/**
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2021-12-22 17:11:12 +00:00
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* clk_get_by_index_nodev() - Get/request a clock by integer index without a
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* device.
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2019-02-27 18:56:52 +00:00
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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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2021-12-22 17:11:12 +00:00
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* @clk: A pointer to a clock struct to initialize.
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*
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2022-01-19 17:05:50 +00:00
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* Return: 0 if OK, or a negative error code.
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2019-02-27 18:56:52 +00:00
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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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2018-04-03 09:44:18 +00:00
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/**
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2021-12-22 17:11:12 +00:00
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* clk_get_bulk() - Get/request all clocks of a device.
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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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2018-04-03 09:44:18 +00:00
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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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2022-01-19 17:05:50 +00:00
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* Return: 0 if OK, or a negative error code.
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2018-04-03 09:44:18 +00:00
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*/
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int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk);
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2015-06-23 21:39:15 +00:00
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/**
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2021-12-22 17:11:12 +00:00
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* clk_get_by_name() - Get/request a clock by name.
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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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* @clk: A pointer to a clock struct to initialize.
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2015-06-23 21:39:15 +00:00
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*
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2016-06-17 15:44:00 +00:00
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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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2022-01-19 17:05:50 +00:00
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* Return: 0 if OK, or a negative error code.
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2015-06-23 21:39:15 +00:00
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*/
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2016-06-17 15:44:00 +00:00
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int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk);
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2017-07-25 11:24:45 +00:00
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2020-01-09 03:35:07 +00:00
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/**
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* clk_get_by_name_nodev - Get/request a clock by name without a device.
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* @node: The client ofnode.
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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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2021-12-22 17:11:12 +00:00
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* @clk: A pointer to a clock struct to initialize.
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*
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2022-01-19 17:05:50 +00:00
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* Return: 0 if OK, or a negative error code.
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2020-01-09 03:35:07 +00:00
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*/
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int clk_get_by_name_nodev(ofnode node, const char *name, struct clk *clk);
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2019-10-22 12:00:04 +00:00
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/**
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2021-12-22 17:11:12 +00:00
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* devm_clk_get() - lookup and obtain a managed reference to a clock producer.
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2019-10-22 12:00:04 +00:00
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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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2021-12-22 17:11:12 +00:00
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* The implementation uses @dev and @id to determine the clock consumer, and
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* thereby the clock producer. (IOW, @id may be identical strings, but clk_get
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* may return different clock producers depending on @dev.)
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2019-10-22 12:00:04 +00:00
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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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* The clock will automatically be freed when the device is unbound
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* from the bus.
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2021-12-22 17:11:12 +00:00
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*
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* Return:
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* a struct clk corresponding to the clock producer, or
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* valid IS_ERR() condition containing errno
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2019-10-22 12:00:04 +00:00
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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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2021-12-22 17:11:12 +00:00
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* devm_clk_get_optional() - lookup and obtain a managed reference to an
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* optional clock producer.
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2019-10-22 12:00:04 +00:00
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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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2021-12-22 17:11:12 +00:00
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* In this case, instead of returning -%ENOENT, the function returns NULL.
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2019-10-22 12:00:04 +00:00
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*/
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2021-12-22 17:11:11 +00:00
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static inline struct clk *devm_clk_get_optional(struct udevice *dev,
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const char *id)
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{
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struct clk *clk = devm_clk_get(dev, id);
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if (PTR_ERR(clk) == -ENODATA)
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return NULL;
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return clk;
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}
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2019-10-22 12:00:04 +00:00
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2017-07-25 11:24:45 +00:00
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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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2021-12-22 17:11:12 +00:00
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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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2017-07-25 11:24:45 +00:00
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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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2022-01-19 17:05:50 +00:00
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* Return: zero on success, or -ve error code.
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2017-07-25 11:24:45 +00:00
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*/
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int clk_release_all(struct clk *clk, int count);
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2019-10-22 12:00:04 +00:00
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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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2016-09-26 11:45:27 +00:00
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#else
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2022-09-27 17:18:19 +00:00
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static inline int clk_get_by_phandle(struct udevice *dev, const
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struct phandle_1_arg *cells,
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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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2016-09-26 11:45:27 +00:00
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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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2022-09-27 17:18:19 +00:00
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static inline int clk_get_by_index_nodev(ofnode node, 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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2018-04-03 09:44:18 +00:00
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static inline int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
|
2016-09-26 11:45:27 +00:00
|
|
|
static inline int clk_get_by_name(struct udevice *dev, const char *name,
|
|
|
|
struct clk *clk)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
2017-07-25 11:24:45 +00:00
|
|
|
|
2022-09-27 17:18:19 +00:00
|
|
|
static inline struct clk *devm_clk_get(struct udevice *dev, const char *id)
|
|
|
|
{
|
|
|
|
return ERR_PTR(-ENOSYS);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline struct clk *devm_clk_get_optional(struct udevice *dev,
|
|
|
|
const char *id)
|
|
|
|
{
|
|
|
|
return ERR_PTR(-ENOSYS);
|
|
|
|
}
|
|
|
|
|
2020-01-09 03:35:07 +00:00
|
|
|
static inline int
|
|
|
|
clk_get_by_name_nodev(ofnode node, const char *name, struct clk *clk)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
|
2021-12-22 17:11:11 +00:00
|
|
|
static inline int clk_release_all(struct clk *clk, int count)
|
2020-01-09 03:35:07 +00:00
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
2022-09-27 17:18:19 +00:00
|
|
|
|
|
|
|
static inline void devm_clk_put(struct udevice *dev, struct clk *clk)
|
|
|
|
{
|
|
|
|
}
|
2021-12-22 17:11:11 +00:00
|
|
|
#endif
|
2020-01-09 03:35:07 +00:00
|
|
|
|
2022-01-15 20:52:47 +00:00
|
|
|
/**
|
|
|
|
* clk_get_by_name_optional() - Get/request a optional clock by name.
|
|
|
|
* @dev: The client device.
|
|
|
|
* @name: The name of the clock to request, within the client's list of
|
|
|
|
* clocks.
|
|
|
|
* @clk: A pointer to a clock struct to initialize.
|
|
|
|
*
|
|
|
|
* Behaves the same as clk_get_by_name(), except when there is no clock
|
|
|
|
* provider. In the latter case, return 0.
|
|
|
|
*
|
|
|
|
* Return: 0 if OK, or a negative error code.
|
|
|
|
*/
|
|
|
|
static inline int clk_get_by_name_optional(struct udevice *dev,
|
|
|
|
const char *name, struct clk *clk)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = clk_get_by_name(dev, name, clk);
|
|
|
|
if (ret == -ENODATA)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2021-12-22 17:11:11 +00:00
|
|
|
/**
|
|
|
|
* clk_get_by_name_nodev_optional - Get/request an optinonal clock by name
|
|
|
|
* without a device.
|
|
|
|
* @node: The client ofnode.
|
|
|
|
* @name: The name of the clock to request, within the client's list of
|
|
|
|
* clocks.
|
2021-12-22 17:11:12 +00:00
|
|
|
* @clk: A pointer to a clock struct to initialize.
|
2021-12-22 17:11:11 +00:00
|
|
|
*
|
|
|
|
* Behaves the same as clk_get_by_name_nodev() except where there is
|
2021-12-22 17:11:12 +00:00
|
|
|
* no clock producer, in this case, skip the error number -%ENODATA, and
|
2021-12-22 17:11:11 +00:00
|
|
|
* the function returns 0.
|
|
|
|
*/
|
|
|
|
static inline int clk_get_by_name_nodev_optional(ofnode node, const char *name,
|
|
|
|
struct clk *clk)
|
2017-07-25 11:24:45 +00:00
|
|
|
{
|
2021-12-22 17:11:11 +00:00
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = clk_get_by_name_nodev(node, name, clk);
|
|
|
|
if (ret == -ENODATA)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
return ret;
|
2017-07-25 11:24:45 +00:00
|
|
|
}
|
2015-06-23 21:39:15 +00:00
|
|
|
|
2021-06-11 04:16:07 +00:00
|
|
|
/**
|
|
|
|
* enum clk_defaults_stage - What stage clk_set_defaults() is called at
|
|
|
|
* @CLK_DEFAULTS_PRE: Called before probe. Setting of defaults for clocks owned
|
|
|
|
* by this clock driver will be defered until after probing.
|
|
|
|
* @CLK_DEFAULTS_POST: Called after probe. Only defaults for clocks owned by
|
|
|
|
* this clock driver will be set.
|
|
|
|
* @CLK_DEFAULTS_POST_FORCE: Called after probe, and always set defaults, even
|
|
|
|
* before relocation. Usually, defaults are not set
|
|
|
|
* pre-relocation to avoid setting them twice (when
|
|
|
|
* the device is probed again post-relocation). This
|
|
|
|
* may incur a performance cost as device tree
|
|
|
|
* properties must be parsed for a second time.
|
|
|
|
* However, when not using SPL, pre-relocation may be
|
|
|
|
* the only time we can set defaults for some clocks
|
|
|
|
* (such as those used for the RAM we will relocate
|
|
|
|
* into).
|
|
|
|
*/
|
|
|
|
enum clk_defaults_stage {
|
|
|
|
CLK_DEFAULTS_PRE = 0,
|
|
|
|
CLK_DEFAULTS_POST = 1,
|
|
|
|
CLK_DEFAULTS_POST_FORCE,
|
|
|
|
};
|
|
|
|
|
2021-08-07 13:24:03 +00:00
|
|
|
#if CONFIG_IS_ENABLED(OF_REAL) && CONFIG_IS_ENABLED(CLK)
|
2018-01-08 12:59:18 +00:00
|
|
|
/**
|
2021-12-22 17:11:12 +00:00
|
|
|
* clk_set_defaults - Process ``assigned-{clocks/clock-parents/clock-rates}``
|
2018-01-08 12:59:18 +00:00
|
|
|
* properties to configure clocks
|
|
|
|
* @dev: A device to process (the ofnode associated with this device
|
|
|
|
* will be processed).
|
2021-06-11 04:16:07 +00:00
|
|
|
* @stage: The stage of the probing process this function is called during.
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
|
|
|
* Return: zero on success, or -ve error code.
|
2018-01-08 12:59:18 +00:00
|
|
|
*/
|
2021-06-11 04:16:07 +00:00
|
|
|
int clk_set_defaults(struct udevice *dev, enum clk_defaults_stage stage);
|
2018-01-08 12:59:18 +00:00
|
|
|
#else
|
2019-10-22 12:00:06 +00:00
|
|
|
static inline int clk_set_defaults(struct udevice *dev, int stage)
|
2018-01-08 12:59:18 +00:00
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2018-04-03 09:44:18 +00:00
|
|
|
/**
|
|
|
|
* clk_release_bulk() - Disable (turn off)/Free an array of previously
|
|
|
|
* requested clocks in a clock bulk struct.
|
2021-12-22 17:11:12 +00:00
|
|
|
* @bulk: A clock bulk struct that was previously successfully
|
|
|
|
* requested by clk_get_bulk().
|
2018-04-03 09:44:18 +00:00
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: zero on success, or -ve error code.
|
2018-04-03 09:44:18 +00:00
|
|
|
*/
|
|
|
|
static inline int clk_release_bulk(struct clk_bulk *bulk)
|
|
|
|
{
|
|
|
|
return clk_release_all(bulk->clks, bulk->count);
|
|
|
|
}
|
|
|
|
|
2020-04-27 13:29:57 +00:00
|
|
|
#if CONFIG_IS_ENABLED(CLK)
|
2015-06-23 21:39:15 +00:00
|
|
|
/**
|
2021-12-22 17:11:12 +00:00
|
|
|
* clk_request() - Request a clock by provider-specific ID.
|
|
|
|
* @dev: The clock provider device.
|
|
|
|
* @clk: 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.
|
2015-06-23 21:39:15 +00:00
|
|
|
*
|
2016-06-17 15:44:00 +00:00
|
|
|
* 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.
|
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: 0 if OK, or a negative error code.
|
2015-06-23 21:39:15 +00:00
|
|
|
*/
|
2016-06-17 15:44:00 +00:00
|
|
|
int clk_request(struct udevice *dev, struct clk *clk);
|
2015-06-23 21:39:15 +00:00
|
|
|
|
2016-01-13 04:16:12 +00:00
|
|
|
/**
|
2021-12-22 17:11:12 +00:00
|
|
|
* clk_free() - Free a previously requested clock.
|
|
|
|
* @clk: A clock struct that was previously successfully requested by
|
2016-06-17 15:44:00 +00:00
|
|
|
* clk_request/get_by_*().
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-15 22:25:04 +00:00
|
|
|
* Free resources allocated by clk_request() (or any clk_get_* function).
|
2016-01-13 04:16:12 +00:00
|
|
|
*/
|
2022-01-15 22:25:04 +00:00
|
|
|
void clk_free(struct clk *clk);
|
2016-01-13 04:16:12 +00:00
|
|
|
|
2015-06-23 21:39:15 +00:00
|
|
|
/**
|
2016-06-17 15:44:00 +00:00
|
|
|
* clk_get_rate() - Get current clock rate.
|
|
|
|
* @clk: A clock struct that was previously successfully requested by
|
|
|
|
* clk_request/get_by_*().
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: clock rate in Hz on success, 0 for invalid clock, or -ve error code
|
2021-02-14 02:17:18 +00:00
|
|
|
* for other errors.
|
2015-06-23 21:39:15 +00:00
|
|
|
*/
|
2016-06-17 15:44:00 +00:00
|
|
|
ulong clk_get_rate(struct clk *clk);
|
2015-06-23 21:39:15 +00:00
|
|
|
|
2019-06-24 13:50:42 +00:00
|
|
|
/**
|
|
|
|
* clk_get_parent() - Get current clock's parent.
|
|
|
|
* @clk: A clock struct that was previously successfully requested by
|
|
|
|
* clk_request/get_by_*().
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: pointer to parent's struct clk, or error code passed as pointer
|
2019-06-24 13:50:42 +00:00
|
|
|
*/
|
|
|
|
struct clk *clk_get_parent(struct clk *clk);
|
|
|
|
|
2019-06-24 13:50:43 +00:00
|
|
|
/**
|
|
|
|
* clk_get_parent_rate() - Get parent of current clock rate.
|
|
|
|
* @clk: A clock struct that was previously successfully requested by
|
|
|
|
* clk_request/get_by_*().
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: clock rate in Hz, or -ve error code.
|
2019-06-24 13:50:43 +00:00
|
|
|
*/
|
|
|
|
long long clk_get_parent_rate(struct clk *clk);
|
|
|
|
|
2020-12-29 23:06:31 +00:00
|
|
|
/**
|
|
|
|
* clk_round_rate() - Adjust a rate to the exact rate a clock can provide
|
2021-12-22 17:11:12 +00:00
|
|
|
* @clk: A clock struct that was previously successfully requested by
|
|
|
|
* clk_request/get_by_*().
|
|
|
|
* @rate: desired clock rate in Hz.
|
2020-12-29 23:06:31 +00:00
|
|
|
*
|
|
|
|
* This answers the question "if I were to pass @rate to clk_set_rate(),
|
|
|
|
* what clock rate would I end up with?" without changing the hardware
|
2021-12-22 17:11:12 +00:00
|
|
|
* in any way. In other words::
|
2020-12-29 23:06:31 +00:00
|
|
|
*
|
|
|
|
* rate = clk_round_rate(clk, r);
|
|
|
|
*
|
2021-12-22 17:11:12 +00:00
|
|
|
* and::
|
2020-12-29 23:06:31 +00:00
|
|
|
*
|
|
|
|
* rate = clk_set_rate(clk, r);
|
|
|
|
*
|
|
|
|
* are equivalent except the former does not modify the clock hardware
|
|
|
|
* in any way.
|
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: rounded rate in Hz, or -ve error code.
|
2020-12-29 23:06:31 +00:00
|
|
|
*/
|
|
|
|
ulong clk_round_rate(struct clk *clk, ulong rate);
|
|
|
|
|
2015-06-23 21:39:15 +00:00
|
|
|
/**
|
2016-06-17 15:44:00 +00:00
|
|
|
* 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.
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: new rate, or -ve error code.
|
2015-06-23 21:39:15 +00:00
|
|
|
*/
|
2016-06-17 15:44:00 +00:00
|
|
|
ulong clk_set_rate(struct clk *clk, ulong rate);
|
2015-06-23 21:39:15 +00:00
|
|
|
|
2018-01-08 10:15:08 +00:00
|
|
|
/**
|
|
|
|
* 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_*().
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: new rate, or -ve error code.
|
2018-01-08 10:15:08 +00:00
|
|
|
*/
|
|
|
|
int clk_set_parent(struct clk *clk, struct clk *parent);
|
|
|
|
|
2016-01-21 02:43:02 +00:00
|
|
|
/**
|
2016-06-17 15:44:00 +00:00
|
|
|
* clk_enable() - Enable (turn on) a clock.
|
|
|
|
* @clk: A clock struct that was previously successfully requested by
|
|
|
|
* clk_request/get_by_*().
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: zero on success, or -ve error code.
|
2016-06-17 15:44:00 +00:00
|
|
|
*/
|
|
|
|
int clk_enable(struct clk *clk);
|
|
|
|
|
2018-04-03 09:44:18 +00:00
|
|
|
/**
|
|
|
|
* 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().
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: zero on success, or -ve error code.
|
2018-04-03 09:44:18 +00:00
|
|
|
*/
|
|
|
|
int clk_enable_bulk(struct clk_bulk *bulk);
|
|
|
|
|
2016-06-17 15:44:00 +00:00
|
|
|
/**
|
|
|
|
* clk_disable() - Disable (turn off) a clock.
|
|
|
|
* @clk: A clock struct that was previously successfully requested by
|
|
|
|
* clk_request/get_by_*().
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: zero on success, or -ve error code.
|
2016-01-21 02:43:02 +00:00
|
|
|
*/
|
2016-06-17 15:44:00 +00:00
|
|
|
int clk_disable(struct clk *clk);
|
2016-01-21 02:43:02 +00:00
|
|
|
|
2018-04-03 09:44:18 +00:00
|
|
|
/**
|
|
|
|
* 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().
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: zero on success, or -ve error code.
|
2018-04-03 09:44:18 +00:00
|
|
|
*/
|
|
|
|
int clk_disable_bulk(struct clk_bulk *bulk);
|
|
|
|
|
2019-08-01 13:42:55 +00:00
|
|
|
/**
|
|
|
|
* clk_is_match - check if two clk's point to the same hardware clock
|
|
|
|
* @p: clk compared against q
|
|
|
|
* @q: clk compared against p
|
|
|
|
*
|
2021-12-22 17:11:12 +00:00
|
|
|
* Return:
|
|
|
|
* %true if the two struct clk pointers both point to the same hardware clock
|
|
|
|
* node, and %false otherwise. Note that two %NULL clks are treated as matching.
|
2019-08-01 13:42:55 +00:00
|
|
|
*/
|
|
|
|
bool clk_is_match(const struct clk *p, const struct clk *q);
|
|
|
|
|
2019-06-24 13:50:44 +00:00
|
|
|
/**
|
|
|
|
* clk_get_by_id() - Get the clock by its ID
|
|
|
|
* @id: The clock ID to search for
|
|
|
|
* @clkp: A pointer to clock struct that has been found among added clocks
|
|
|
|
* to UCLASS_CLK
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: zero on success, or -ENOENT on error
|
2019-06-24 13:50:44 +00:00
|
|
|
*/
|
|
|
|
int clk_get_by_id(ulong id, struct clk **clkp);
|
2019-07-31 07:01:23 +00:00
|
|
|
|
|
|
|
/**
|
|
|
|
* clk_dev_binded() - Check whether the clk has a device binded
|
2021-12-22 17:11:12 +00:00
|
|
|
* @clk: A pointer to the clk
|
2019-07-31 07:01:23 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: true on binded, or false on no
|
2019-07-31 07:01:23 +00:00
|
|
|
*/
|
|
|
|
bool clk_dev_binded(struct clk *clk);
|
2020-04-27 13:29:57 +00:00
|
|
|
|
|
|
|
#else /* CONFIG_IS_ENABLED(CLK) */
|
|
|
|
|
|
|
|
static inline int clk_request(struct udevice *dev, struct clk *clk)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
|
2022-01-15 22:25:04 +00:00
|
|
|
static inline void clk_free(struct clk *clk)
|
2020-04-27 13:29:57 +00:00
|
|
|
{
|
2022-01-15 22:25:04 +00:00
|
|
|
return;
|
2020-04-27 13:29:57 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline ulong clk_get_rate(struct clk *clk)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline struct clk *clk_get_parent(struct clk *clk)
|
|
|
|
{
|
|
|
|
return ERR_PTR(-ENOSYS);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline long long clk_get_parent_rate(struct clk *clk)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
|
2020-12-29 23:06:31 +00:00
|
|
|
static inline ulong clk_round_rate(struct clk *clk, ulong rate)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
|
2020-04-27 13:29:57 +00:00
|
|
|
static inline ulong clk_set_rate(struct clk *clk, ulong rate)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int clk_set_parent(struct clk *clk, struct clk *parent)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int clk_enable(struct clk *clk)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int clk_enable_bulk(struct clk_bulk *bulk)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int clk_disable(struct clk *clk)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int clk_disable_bulk(struct clk_bulk *bulk)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline bool clk_is_match(const struct clk *p, const struct clk *q)
|
|
|
|
{
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline int clk_get_by_id(ulong id, struct clk **clkp)
|
|
|
|
{
|
|
|
|
return -ENOSYS;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline bool clk_dev_binded(struct clk *clk)
|
|
|
|
{
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_IS_ENABLED(CLK) */
|
|
|
|
|
|
|
|
/**
|
|
|
|
* clk_valid() - check if clk is valid
|
|
|
|
* @clk: the clock to check
|
2021-12-22 17:11:12 +00:00
|
|
|
*
|
2022-01-19 17:05:50 +00:00
|
|
|
* Return: true if valid, or false
|
2020-04-27 13:29:57 +00:00
|
|
|
*/
|
|
|
|
static inline bool clk_valid(struct clk *clk)
|
|
|
|
{
|
|
|
|
return clk && !!clk->dev;
|
|
|
|
}
|
|
|
|
|
|
|
|
int soc_clk_dump(void);
|
|
|
|
|
2016-06-17 15:44:00 +00:00
|
|
|
#endif
|
2019-10-22 12:00:04 +00:00
|
|
|
|
|
|
|
#define clk_prepare_enable(clk) clk_enable(clk)
|
|
|
|
#define clk_disable_unprepare(clk) clk_disable(clk)
|