mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-21 01:18:52 +09:00
![Masahiro Yamada](/assets/img/avatar_default.png)
This reverts commit 82f5279b0c
.
The build failure of k2*evm boards was fixed in a different way by
the previous commit. It is nasty to patch generic drivers around
with #ifdef CONFIG_CLK just for the KeyStone's matter.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
180 lines
6.1 KiB
C
180 lines
6.1 KiB
C
/*
|
|
* Copyright (c) 2015 Google, Inc
|
|
* Written by Simon Glass <sjg@chromium.org>
|
|
* Copyright (c) 2016, NVIDIA CORPORATION.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#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;
|
|
};
|
|
|
|
#if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(CLK)
|
|
struct phandle_2_cell;
|
|
int clk_get_by_index_platdata(struct udevice *dev, int index,
|
|
struct phandle_2_cell *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_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);
|
|
#else
|
|
static inline int clk_get_by_index(struct udevice *dev, int index,
|
|
struct clk *clk)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
|
|
static inline int clk_get_by_name(struct udevice *dev, const char *name,
|
|
struct clk *clk)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* 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_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_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);
|
|
|
|
int soc_clk_dump(void);
|
|
|
|
#endif
|