![Linus Torvalds](/assets/img/avatar_default.png)
drivers, along with a pretty standard number of new drivers. The core recieved a small number of updates as well. Core changes of note: * Removed CLK_IS_ROOT flag New clk provider drivers: * Renesas r8a7796 Clock Pulse Generator / Module Standby and Software Reset * Allwinner sun8i H3 Clock Controller Unit * AmLogic meson8b clock controller (rewritten) * AmLogic gxbb clock controller * Support for some new ICs was added by simple changes to static data tables for chips sharing the same family Driver updates of note: * the Allwinner sunxi clock driver infrastucture was rewritten to comform to the state of the art at drivers/clk/sunxi-ng. The old implementation is still supported for backwards compatibility with the DT ABI -----BEGIN PGP SIGNATURE----- iQIcBAABCAAGBQJXm9LNAAoJEKI6nJvDJaTUHYcP/1oKTHA4uSPux2+5l9vApEJc eSV0oSEP/zDDwYfV4xRt1byAOtzHe3R4p5zDGShnk3+CCwXbQSLGmFJFmZDoSs5E ulftXA8uRV4ac0SEh86BOlstdJHGOVo7Q38XtdPvgKRTv58+ZqHuFcvB726bWY/I GMzVTkpugbn5U7e3MLM58gkBoqa8BS9uIdsf5q/JIxdpe+VgUtjmioH9Rz6G5U5Y T6ObeU6HNusDaz6kUJIiAEkl4UNHk+aebnY7FTbwd9JGGySp5nEknVY7tSMeC6iU hG/knzdMiasa5yv0xdW3/OxnKCQtEeuPPHnJDSXWc9yb20vNs2QhRtd8uckMGHOH X7fXq9xoLxDH81AggW188g7+xfhx7J+ASpjHmHs74itUIoqhhy61PM3I95yQ8m6s QDkInqSszFd2C7OiYsy6m5XS0K8g0jyA2tzWhxlIZNVAl7yP71+HVLJ45NNKCPkb oYbMx4ho538Tl6+c6HHJG0vC3XWSdHbvwMOKyE9k/GyrIJ7FxLZS3BLOYPm6u9t4 9n041MbtBb/UrWVi8kMSdmBjIIs6VSGjq5gwRFAqoPQt3VkPuy0IfnwIpjdE1aFz PbDJQF4ze7D3JgH2rWtivXbCTRthTANmoar299xjSwwb99TSlP2IABY3cNnJrhPr 9/PGShM3hqRpBEUnEmt+ =1dpY -----END PGP SIGNATURE----- Merge tag 'clk-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux Pull clk updates from Michael Turquette: "The bulk of the changes are updates and fixes to existing clk provider drivers, along with a pretty standard number of new drivers. The core recieved a small number of updates as well. Core changes of note: - removed CLK_IS_ROOT flag New clk provider drivers: - Renesas r8a7796 clock pulse generator / module standby and software reset - Allwinner sun8i H3 clock controller unit - AmLogic meson8b clock controller (rewritten) - AmLogic gxbb clock controller - support for some new ICs was added by simple changes to static data tables for chips sharing the same family Driver updates of note: - the Allwinner sunxi clock driver infrastucture was rewritten to comform to the state of the art at drivers/clk/sunxi-ng. The old implementation is still supported for backwards compatibility with the DT ABI" * tag 'clk-for-linus-4.8' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (162 commits) clk: Makefile: re-sort and clean up Revert "clk: gxbb: expose CLKID_MMC_PCLK" clk: samsung: Allow modular build of the Audio Subsystem CLKCON driver clk: samsung: make clk-s5pv210-audss explicitly non-modular clk: exynos5433: remove CLK_IGNORE_UNUSED flag from SPI clocks clk: oxnas: Add hardware dependencies clk: imx7d: do not set parent of ethernet time/ref clocks ARM: dt: sun8i: switch the H3 to the new CCU driver clk: sunxi-ng: h3: Fix Kconfig symbol typo clk: sunxi-ng: h3: Fix audio clock divider offset clk: sunxi-ng: Add H3 clocks clk: sunxi-ng: Add N-K-M-P factor clock clk: sunxi-ng: Add N-K-M Factor clock clk: sunxi-ng: Add N-M-factor clock support clk: sunxi-ng: Add N-K-factor clock support clk: sunxi-ng: Add M-P factor clock support clk: sunxi-ng: Add divider clk: sunxi-ng: Add phase clock support clk: sunxi-ng: Add mux clock support clk: sunxi-ng: Add gate clock support ...
524 lines
14 KiB
C
524 lines
14 KiB
C
/*
|
|
* linux/include/linux/clk.h
|
|
*
|
|
* Copyright (C) 2004 ARM Limited.
|
|
* Written by Deep Blue Solutions Limited.
|
|
* Copyright (C) 2011-2012 Linaro Ltd <mturquette@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#ifndef __LINUX_CLK_H
|
|
#define __LINUX_CLK_H
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/notifier.h>
|
|
|
|
struct device;
|
|
|
|
struct clk;
|
|
|
|
/**
|
|
* DOC: clk notifier callback types
|
|
*
|
|
* PRE_RATE_CHANGE - called immediately before the clk rate is changed,
|
|
* to indicate that the rate change will proceed. Drivers must
|
|
* immediately terminate any operations that will be affected by the
|
|
* rate change. Callbacks may either return NOTIFY_DONE, NOTIFY_OK,
|
|
* NOTIFY_STOP or NOTIFY_BAD.
|
|
*
|
|
* ABORT_RATE_CHANGE: called if the rate change failed for some reason
|
|
* after PRE_RATE_CHANGE. In this case, all registered notifiers on
|
|
* the clk will be called with ABORT_RATE_CHANGE. Callbacks must
|
|
* always return NOTIFY_DONE or NOTIFY_OK.
|
|
*
|
|
* POST_RATE_CHANGE - called after the clk rate change has successfully
|
|
* completed. Callbacks must always return NOTIFY_DONE or NOTIFY_OK.
|
|
*
|
|
*/
|
|
#define PRE_RATE_CHANGE BIT(0)
|
|
#define POST_RATE_CHANGE BIT(1)
|
|
#define ABORT_RATE_CHANGE BIT(2)
|
|
|
|
/**
|
|
* struct clk_notifier - associate a clk with a notifier
|
|
* @clk: struct clk * to associate the notifier with
|
|
* @notifier_head: a blocking_notifier_head for this clk
|
|
* @node: linked list pointers
|
|
*
|
|
* A list of struct clk_notifier is maintained by the notifier code.
|
|
* An entry is created whenever code registers the first notifier on a
|
|
* particular @clk. Future notifiers on that @clk are added to the
|
|
* @notifier_head.
|
|
*/
|
|
struct clk_notifier {
|
|
struct clk *clk;
|
|
struct srcu_notifier_head notifier_head;
|
|
struct list_head node;
|
|
};
|
|
|
|
/**
|
|
* struct clk_notifier_data - rate data to pass to the notifier callback
|
|
* @clk: struct clk * being changed
|
|
* @old_rate: previous rate of this clk
|
|
* @new_rate: new rate of this clk
|
|
*
|
|
* For a pre-notifier, old_rate is the clk's rate before this rate
|
|
* change, and new_rate is what the rate will be in the future. For a
|
|
* post-notifier, old_rate and new_rate are both set to the clk's
|
|
* current rate (this was done to optimize the implementation).
|
|
*/
|
|
struct clk_notifier_data {
|
|
struct clk *clk;
|
|
unsigned long old_rate;
|
|
unsigned long new_rate;
|
|
};
|
|
|
|
#ifdef CONFIG_COMMON_CLK
|
|
|
|
/**
|
|
* clk_notifier_register: register a clock rate-change notifier callback
|
|
* @clk: clock whose rate we are interested in
|
|
* @nb: notifier block with callback function pointer
|
|
*
|
|
* ProTip: debugging across notifier chains can be frustrating. Make sure that
|
|
* your notifier callback function prints a nice big warning in case of
|
|
* failure.
|
|
*/
|
|
int clk_notifier_register(struct clk *clk, struct notifier_block *nb);
|
|
|
|
/**
|
|
* clk_notifier_unregister: unregister a clock rate-change notifier callback
|
|
* @clk: clock whose rate we are no longer interested in
|
|
* @nb: notifier block which will be unregistered
|
|
*/
|
|
int clk_notifier_unregister(struct clk *clk, struct notifier_block *nb);
|
|
|
|
/**
|
|
* clk_get_accuracy - obtain the clock accuracy in ppb (parts per billion)
|
|
* for a clock source.
|
|
* @clk: clock source
|
|
*
|
|
* This gets the clock source accuracy expressed in ppb.
|
|
* A perfect clock returns 0.
|
|
*/
|
|
long clk_get_accuracy(struct clk *clk);
|
|
|
|
/**
|
|
* clk_set_phase - adjust the phase shift of a clock signal
|
|
* @clk: clock signal source
|
|
* @degrees: number of degrees the signal is shifted
|
|
*
|
|
* Shifts the phase of a clock signal by the specified degrees. Returns 0 on
|
|
* success, -EERROR otherwise.
|
|
*/
|
|
int clk_set_phase(struct clk *clk, int degrees);
|
|
|
|
/**
|
|
* clk_get_phase - return the phase shift of a clock signal
|
|
* @clk: clock signal source
|
|
*
|
|
* Returns the phase shift of a clock node in degrees, otherwise returns
|
|
* -EERROR.
|
|
*/
|
|
int clk_get_phase(struct clk *clk);
|
|
|
|
/**
|
|
* clk_is_match - check if two clk's point to the same hardware clock
|
|
* @p: clk compared against q
|
|
* @q: clk compared against p
|
|
*
|
|
* Returns true if the two struct clk pointers both point to the same hardware
|
|
* clock node. Put differently, returns true if struct clk *p and struct clk *q
|
|
* share the same struct clk_core object.
|
|
*
|
|
* Returns false otherwise. Note that two NULL clks are treated as matching.
|
|
*/
|
|
bool clk_is_match(const struct clk *p, const struct clk *q);
|
|
|
|
#else
|
|
|
|
static inline int clk_notifier_register(struct clk *clk,
|
|
struct notifier_block *nb)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline int clk_notifier_unregister(struct clk *clk,
|
|
struct notifier_block *nb)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline long clk_get_accuracy(struct clk *clk)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline long clk_set_phase(struct clk *clk, int phase)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline long clk_get_phase(struct clk *clk)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline bool clk_is_match(const struct clk *p, const struct clk *q)
|
|
{
|
|
return p == q;
|
|
}
|
|
|
|
#endif
|
|
|
|
/**
|
|
* clk_prepare - prepare a clock source
|
|
* @clk: clock source
|
|
*
|
|
* This prepares the clock source for use.
|
|
*
|
|
* Must not be called from within atomic context.
|
|
*/
|
|
#ifdef CONFIG_HAVE_CLK_PREPARE
|
|
int clk_prepare(struct clk *clk);
|
|
#else
|
|
static inline int clk_prepare(struct clk *clk)
|
|
{
|
|
might_sleep();
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* clk_unprepare - undo preparation of a clock source
|
|
* @clk: clock source
|
|
*
|
|
* This undoes a previously prepared clock. The caller must balance
|
|
* the number of prepare and unprepare calls.
|
|
*
|
|
* Must not be called from within atomic context.
|
|
*/
|
|
#ifdef CONFIG_HAVE_CLK_PREPARE
|
|
void clk_unprepare(struct clk *clk);
|
|
#else
|
|
static inline void clk_unprepare(struct clk *clk)
|
|
{
|
|
might_sleep();
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_HAVE_CLK
|
|
/**
|
|
* clk_get - lookup and obtain a reference to a clock producer.
|
|
* @dev: device for clock "consumer"
|
|
* @id: clock consumer ID
|
|
*
|
|
* Returns a struct clk corresponding to the clock producer, or
|
|
* valid IS_ERR() condition containing errno. The implementation
|
|
* uses @dev and @id to determine the clock consumer, and thereby
|
|
* the clock producer. (IOW, @id may be identical strings, but
|
|
* clk_get may return different clock producers depending on @dev.)
|
|
*
|
|
* Drivers must assume that the clock source is not enabled.
|
|
*
|
|
* clk_get should not be called from within interrupt context.
|
|
*/
|
|
struct clk *clk_get(struct device *dev, const char *id);
|
|
|
|
/**
|
|
* devm_clk_get - lookup and obtain a managed reference to a clock producer.
|
|
* @dev: device for clock "consumer"
|
|
* @id: clock consumer ID
|
|
*
|
|
* Returns a struct clk corresponding to the clock producer, or
|
|
* valid IS_ERR() condition containing errno. The implementation
|
|
* uses @dev and @id to determine the clock consumer, and thereby
|
|
* the clock producer. (IOW, @id may be identical strings, but
|
|
* clk_get may return different clock producers depending on @dev.)
|
|
*
|
|
* Drivers must assume that the clock source is not enabled.
|
|
*
|
|
* devm_clk_get should not be called from within interrupt context.
|
|
*
|
|
* The clock will automatically be freed when the device is unbound
|
|
* from the bus.
|
|
*/
|
|
struct clk *devm_clk_get(struct device *dev, const char *id);
|
|
|
|
/**
|
|
* clk_enable - inform the system when the clock source should be running.
|
|
* @clk: clock source
|
|
*
|
|
* If the clock can not be enabled/disabled, this should return success.
|
|
*
|
|
* May be called from atomic contexts.
|
|
*
|
|
* Returns success (0) or negative errno.
|
|
*/
|
|
int clk_enable(struct clk *clk);
|
|
|
|
/**
|
|
* clk_disable - inform the system when the clock source is no longer required.
|
|
* @clk: clock source
|
|
*
|
|
* Inform the system that a clock source is no longer required by
|
|
* a driver and may be shut down.
|
|
*
|
|
* May be called from atomic contexts.
|
|
*
|
|
* Implementation detail: if the clock source is shared between
|
|
* multiple drivers, clk_enable() calls must be balanced by the
|
|
* same number of clk_disable() calls for the clock source to be
|
|
* disabled.
|
|
*/
|
|
void clk_disable(struct clk *clk);
|
|
|
|
/**
|
|
* clk_get_rate - obtain the current clock rate (in Hz) for a clock source.
|
|
* This is only valid once the clock source has been enabled.
|
|
* @clk: clock source
|
|
*/
|
|
unsigned long clk_get_rate(struct clk *clk);
|
|
|
|
/**
|
|
* clk_put - "free" the clock source
|
|
* @clk: clock source
|
|
*
|
|
* Note: drivers must ensure that all clk_enable calls made on this
|
|
* clock source are balanced by clk_disable calls prior to calling
|
|
* this function.
|
|
*
|
|
* clk_put should not be called from within interrupt context.
|
|
*/
|
|
void clk_put(struct clk *clk);
|
|
|
|
/**
|
|
* devm_clk_put - "free" a managed clock source
|
|
* @dev: device used to acquire the clock
|
|
* @clk: clock source acquired with devm_clk_get()
|
|
*
|
|
* Note: drivers must ensure that all clk_enable calls made on this
|
|
* clock source are balanced by clk_disable calls prior to calling
|
|
* this function.
|
|
*
|
|
* clk_put should not be called from within interrupt context.
|
|
*/
|
|
void devm_clk_put(struct device *dev, struct clk *clk);
|
|
|
|
/*
|
|
* The remaining APIs are optional for machine class support.
|
|
*/
|
|
|
|
|
|
/**
|
|
* clk_round_rate - adjust a rate to the exact rate a clock can provide
|
|
* @clk: clock source
|
|
* @rate: desired clock rate in Hz
|
|
*
|
|
* 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
|
|
* in any way. In other words:
|
|
*
|
|
* rate = clk_round_rate(clk, r);
|
|
*
|
|
* and:
|
|
*
|
|
* clk_set_rate(clk, r);
|
|
* rate = clk_get_rate(clk);
|
|
*
|
|
* are equivalent except the former does not modify the clock hardware
|
|
* in any way.
|
|
*
|
|
* Returns rounded clock rate in Hz, or negative errno.
|
|
*/
|
|
long clk_round_rate(struct clk *clk, unsigned long rate);
|
|
|
|
/**
|
|
* clk_set_rate - set the clock rate for a clock source
|
|
* @clk: clock source
|
|
* @rate: desired clock rate in Hz
|
|
*
|
|
* Returns success (0) or negative errno.
|
|
*/
|
|
int clk_set_rate(struct clk *clk, unsigned long rate);
|
|
|
|
/**
|
|
* clk_has_parent - check if a clock is a possible parent for another
|
|
* @clk: clock source
|
|
* @parent: parent clock source
|
|
*
|
|
* This function can be used in drivers that need to check that a clock can be
|
|
* the parent of another without actually changing the parent.
|
|
*
|
|
* Returns true if @parent is a possible parent for @clk, false otherwise.
|
|
*/
|
|
bool clk_has_parent(struct clk *clk, struct clk *parent);
|
|
|
|
/**
|
|
* clk_set_rate_range - set a rate range for a clock source
|
|
* @clk: clock source
|
|
* @min: desired minimum clock rate in Hz, inclusive
|
|
* @max: desired maximum clock rate in Hz, inclusive
|
|
*
|
|
* Returns success (0) or negative errno.
|
|
*/
|
|
int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max);
|
|
|
|
/**
|
|
* clk_set_min_rate - set a minimum clock rate for a clock source
|
|
* @clk: clock source
|
|
* @rate: desired minimum clock rate in Hz, inclusive
|
|
*
|
|
* Returns success (0) or negative errno.
|
|
*/
|
|
int clk_set_min_rate(struct clk *clk, unsigned long rate);
|
|
|
|
/**
|
|
* clk_set_max_rate - set a maximum clock rate for a clock source
|
|
* @clk: clock source
|
|
* @rate: desired maximum clock rate in Hz, inclusive
|
|
*
|
|
* Returns success (0) or negative errno.
|
|
*/
|
|
int clk_set_max_rate(struct clk *clk, unsigned long rate);
|
|
|
|
/**
|
|
* clk_set_parent - set the parent clock source for this clock
|
|
* @clk: clock source
|
|
* @parent: parent clock source
|
|
*
|
|
* Returns success (0) or negative errno.
|
|
*/
|
|
int clk_set_parent(struct clk *clk, struct clk *parent);
|
|
|
|
/**
|
|
* clk_get_parent - get the parent clock source for this clock
|
|
* @clk: clock source
|
|
*
|
|
* Returns struct clk corresponding to parent clock source, or
|
|
* valid IS_ERR() condition containing errno.
|
|
*/
|
|
struct clk *clk_get_parent(struct clk *clk);
|
|
|
|
/**
|
|
* clk_get_sys - get a clock based upon the device name
|
|
* @dev_id: device name
|
|
* @con_id: connection ID
|
|
*
|
|
* Returns a struct clk corresponding to the clock producer, or
|
|
* valid IS_ERR() condition containing errno. The implementation
|
|
* uses @dev_id and @con_id to determine the clock consumer, and
|
|
* thereby the clock producer. In contrast to clk_get() this function
|
|
* takes the device name instead of the device itself for identification.
|
|
*
|
|
* Drivers must assume that the clock source is not enabled.
|
|
*
|
|
* clk_get_sys should not be called from within interrupt context.
|
|
*/
|
|
struct clk *clk_get_sys(const char *dev_id, const char *con_id);
|
|
|
|
#else /* !CONFIG_HAVE_CLK */
|
|
|
|
static inline struct clk *clk_get(struct device *dev, const char *id)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct clk *devm_clk_get(struct device *dev, const char *id)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline void clk_put(struct clk *clk) {}
|
|
|
|
static inline void devm_clk_put(struct device *dev, struct clk *clk) {}
|
|
|
|
static inline int clk_enable(struct clk *clk)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void clk_disable(struct clk *clk) {}
|
|
|
|
static inline unsigned long clk_get_rate(struct clk *clk)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int clk_set_rate(struct clk *clk, unsigned long rate)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline long clk_round_rate(struct clk *clk, unsigned long rate)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline bool clk_has_parent(struct clk *clk, struct clk *parent)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline int clk_set_parent(struct clk *clk, struct clk *parent)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline struct clk *clk_get_parent(struct clk *clk)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct clk *clk_get_sys(const char *dev_id, const char *con_id)
|
|
{
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
/* clk_prepare_enable helps cases using clk_enable in non-atomic context. */
|
|
static inline int clk_prepare_enable(struct clk *clk)
|
|
{
|
|
int ret;
|
|
|
|
ret = clk_prepare(clk);
|
|
if (ret)
|
|
return ret;
|
|
ret = clk_enable(clk);
|
|
if (ret)
|
|
clk_unprepare(clk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* clk_disable_unprepare helps cases using clk_disable in non-atomic context. */
|
|
static inline void clk_disable_unprepare(struct clk *clk)
|
|
{
|
|
clk_disable(clk);
|
|
clk_unprepare(clk);
|
|
}
|
|
|
|
struct device_node;
|
|
struct of_phandle_args;
|
|
|
|
#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
|
|
struct clk *of_clk_get(struct device_node *np, int index);
|
|
struct clk *of_clk_get_by_name(struct device_node *np, const char *name);
|
|
struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec);
|
|
#else
|
|
static inline struct clk *of_clk_get(struct device_node *np, int index)
|
|
{
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
static inline struct clk *of_clk_get_by_name(struct device_node *np,
|
|
const char *name)
|
|
{
|
|
return ERR_PTR(-ENOENT);
|
|
}
|
|
#endif
|
|
|
|
#endif
|