#define _CLK_H_
#include <dm/ofnode.h>
+#include <linux/err.h>
#include <linux/errno.h>
#include <linux/types.h>
/**
+ * DOC: Overview
+ *
* 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
/**
* 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.
* @rate: The clock rate (in HZ).
- * @flags: Flags used across common clock structure (e.g. CLK_)
+ * @flags: Flags used across common clock structure (e.g. %CLK_)
* Clock IP blocks specific flags (i.e. mux, div, gate, etc) are defined
- * in struct's for those devices (e.g. struct clk_mux).
+ * in struct's for those devices (e.g. &struct clk_mux).
+ * @enable_count: The number of times this clock has been enabled.
* @id: The clock signal ID within the provider.
* @data: An optional data field for scenarios where a single integer ID is not
* sufficient. If used, it can be populated through an .of_xlate op and
* processed during the various clock ops.
*
+ * 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.
+ *
* Should additional information to identify and configure any clock signal
* for any provider be required in the future, the struct could be expanded to
* either (a) add more fields to allow clock providers to store additional
/**
* struct clk_bulk - A handle to (allowing control of) a bulk of clocks.
+ * @clks: An array of clock handles.
+ * @count: The number of clock handles in the clks array.
*
* Clients provide storage for the clock bulk. The content of the structure is
* managed solely by the clock API. A clock bulk struct is
* initialized by "get"ing the clock bulk struct.
* The clock bulk struct is passed to all other bulk clock APIs to apply
* the API to all the clock in the bulk struct.
- *
- * @clks: An array of clock handles.
- * @count: The number of clock handles in the clks array.
*/
struct clk_bulk {
struct clk *clks;
#if CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(CLK)
struct phandle_1_arg;
-int clk_get_by_index_platdata(struct udevice *dev, int index,
- struct phandle_1_arg *cells, struct clk *clk);
+/**
+ * clk_get_by_phandle() - Get a clock by its phandle information (of-platadata)
+ * @dev: Device containing the phandle
+ * @cells: Phandle info
+ * @clk: A pointer to a clock struct to initialise
+ *
+ * This function is used when of-platdata is enabled.
+ *
+ * This looks up a clock using the phandle info. With dtoc, each phandle in the
+ * 'clocks' property is transformed into an idx representing the device.
+ * For example::
+ *
+ * clocks = <&dpll_mpu_ck 23>;
+ *
+ * might result in::
+ *
+ * .clocks = {1, {23}},},
+ *
+ * indicating that the clock is udevice idx 1 in dt-plat.c with an argument of
+ * 23. This function can return a valid clock given the above information. In
+ * this example it would return a clock containing the 'dpll_mpu_ck' device and
+ * the clock ID 23.
+ *
+ * Return: 0 if OK, or a negative error code.
+ */
+int clk_get_by_phandle(struct udevice *dev, const struct phandle_1_arg *cells,
+ struct clk *clk);
/**
- * clock_get_by_index - Get/request a clock by integer index.
+ * clk_get_by_index() - Get/request a clock by integer index.
+ * @dev: The client device.
+ * @index: The index of the clock to request, within the client's list of
+ * clocks.
+ * @clk: A pointer to a clock struct to initialize.
*
* 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,
* 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.
+ * 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_index_nodev - Get/request a clock by integer index
- * without a device.
- *
- * This is a version of clk_get_by_index() that does not use a device.
- *
+ * clk_get_by_index_nodev() - Get/request a clock by integer index without a
+ * device.
* @node: The client ofnode.
* @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.
+ * @clk: A pointer to a clock struct to initialize.
+ *
+ * Return: 0 if OK, or a negative error code.
*/
int clk_get_by_index_nodev(ofnode node, int index, struct clk *clk);
/**
- * clock_get_bulk - Get/request all clocks of a device.
+ * clk_get_bulk() - Get/request all clocks of a device.
+ * @dev: The client device.
+ * @bulk: A pointer to a clock bulk struct to initialize.
*
* This looks up and requests all clocks of the client device; each device is
* assumed to have n clocks associated with it somehow, and this function finds
* device clock indices to provider clocks may be via device-tree properties,
* board-provided mapping tables, or some other mechanism.
*
- * @dev: The client device.
- * @bulk A pointer to a clock bulk struct to initialize.
- * @return 0 if OK, or a negative error code.
+ * Return: 0 if OK, or a negative error code.
*/
int clk_get_bulk(struct udevice *dev, struct clk_bulk *bulk);
/**
- * clock_get_by_name - Get/request a clock by name.
+ * clk_get_by_name() - Get/request a 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.
*
* 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,
* device clock names to provider clocks may be via device-tree properties,
* board-provided mapping tables, or some other mechanism.
*
- * @dev: The client device.
+ * Return: 0 if OK, or a negative error code.
+ */
+int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk);
+
+/**
+ * clk_get_by_name_nodev - Get/request a 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.
- * @clock: A pointer to a clock struct to initialize.
- * @return 0 if OK, or a negative error code.
+ * @clk: 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);
+int clk_get_by_name_nodev(ofnode node, const char *name, struct clk *clk);
/**
- * devm_clk_get - lookup and obtain a managed reference to a clock producer.
+ * 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.)
+ * 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.
+ *
+ * Return:
+ * a struct clk corresponding to the clock producer, or
+ * valid IS_ERR() condition containing errno
*/
struct clk *devm_clk_get(struct udevice *dev, const char *id);
/**
- * devm_clk_get_optional - lookup and obtain a managed reference to an optional
- * clock producer.
+ * devm_clk_get_optional() - lookup and obtain a managed reference to an
+ * optional clock producer.
* @dev: device for clock "consumer"
* @id: clock consumer ID
*
* Behaves the same as devm_clk_get() except where there is no clock producer.
- * In this case, instead of returning -ENOENT, the function returns NULL.
+ * In this case, instead of returning -%ENOENT, the function returns NULL.
*/
-struct clk *devm_clk_get_optional(struct udevice *dev, const char *id);
+static inline struct clk *devm_clk_get_optional(struct udevice *dev,
+ const char *id)
+{
+ struct clk *clk = devm_clk_get(dev, id);
+
+ if (PTR_ERR(clk) == -ENODATA)
+ return NULL;
+
+ return clk;
+}
/**
* clk_release_all() - Disable (turn off)/Free an array of previously
* requested clocks.
+ * @clk: A clock struct array that was previously successfully
+ * requested by clk_request/get_by_*().
+ * @count: Number of clock contained in the array
*
* For each clock contained in the clock array, this function will check if
* clock has been previously requested and then will disable and free it.
*
- * @clk: A clock struct array that was previously successfully
- * requested by clk_request/get_by_*().
- * @count Number of clock contained in the array
- * @return zero on success, or -ve error code.
+ * Return: zero on success, or -ve error code.
*/
int clk_release_all(struct clk *clk, int count);
return -ENOSYS;
}
+static inline int
+clk_get_by_name_nodev(ofnode node, const char *name, struct clk *clk)
+{
+ return -ENOSYS;
+}
+
static inline int clk_release_all(struct clk *clk, int count)
{
return -ENOSYS;
}
#endif
-#if (CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)) && \
- CONFIG_IS_ENABLED(CLK)
/**
- * clk_set_defaults - Process 'assigned-{clocks/clock-parents/clock-rates}'
- * properties to configure clocks
+ * 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;
+}
+
+/**
+ * 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.
+ * @clk: A pointer to a clock struct to initialize.
+ *
+ * Behaves the same as clk_get_by_name_nodev() except where there is
+ * no clock producer, in this case, skip the error number -%ENODATA, and
+ * the function returns 0.
+ */
+static inline int clk_get_by_name_nodev_optional(ofnode node, const char *name,
+ struct clk *clk)
+{
+ int ret;
+
+ ret = clk_get_by_name_nodev(node, name, clk);
+ if (ret == -ENODATA)
+ return 0;
+
+ return ret;
+}
+
+/**
+ * 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,
+};
+
+#if CONFIG_IS_ENABLED(OF_REAL) && CONFIG_IS_ENABLED(CLK)
+/**
+ * clk_set_defaults - Process ``assigned-{clocks/clock-parents/clock-rates}``
+ * properties to configure clocks
* @dev: A device to process (the ofnode associated with this device
* will be processed).
+ * @stage: The stage of the probing process this function is called during.
+ *
+ * Return: zero on success, or -ve error code.
*/
-int clk_set_defaults(struct udevice *dev);
+int clk_set_defaults(struct udevice *dev, enum clk_defaults_stage stage);
#else
-static inline int clk_set_defaults(struct udevice *dev)
+static inline int clk_set_defaults(struct udevice *dev, int stage)
{
return 0;
}
/**
* clk_release_bulk() - Disable (turn off)/Free an array of previously
* requested clocks in a clock bulk struct.
+ * @bulk: A clock bulk struct that was previously successfully
+ * requested by clk_get_bulk().
*
* For each clock contained in the clock bulk struct, this function will check
* if clock has been previously requested and then will disable and free it.
*
- * @clk: A clock bulk struct that was previously successfully
- * requested by clk_get_bulk().
- * @return zero on success, or -ve error code.
+ * Return: zero on success, or -ve error code.
*/
static inline int clk_release_bulk(struct clk_bulk *bulk)
{
return clk_release_all(bulk->clks, bulk->count);
}
+#if CONFIG_IS_ENABLED(CLK)
/**
- * clk_request - Request a clock by provider-specific ID.
+ * 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.
*
* 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.
+ * 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_free() - Free a previously requested clock.
+ * @clk: A clock struct that was previously successfully requested by
* clk_request/get_by_*().
- * @return 0 if OK, or a negative error code.
+ *
+ * Free resources allocated by clk_request() (or any clk_get_* function).
*/
-int clk_free(struct clk *clk);
+void 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.
+ *
+ * Return: clock rate in Hz on success, 0 for invalid clock, or -ve error code
+ * for other errors.
*/
ulong clk_get_rate(struct clk *clk);
/**
* clk_get_parent() - Get current clock's parent.
- *
* @clk: A clock struct that was previously successfully requested by
* clk_request/get_by_*().
- * @return pointer to parent's struct clk, or error code passed as pointer
+ *
+ * Return: pointer to parent's struct clk, or error code passed as pointer
*/
struct clk *clk_get_parent(struct clk *clk);
/**
* clk_get_parent_rate() - Get parent of 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.
+ *
+ * Return: clock rate in Hz, or -ve error code.
*/
long long clk_get_parent_rate(struct clk *clk);
/**
- * clk_set_rate() - Set current clock rate.
+ * clk_round_rate() - Adjust a rate to the exact rate a clock can provide
+ * @clk: A clock struct that was previously successfully requested by
+ * clk_request/get_by_*().
+ * @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::
*
+ * rate = clk_set_rate(clk, r);
+ *
+ * are equivalent except the former does not modify the clock hardware
+ * in any way.
+ *
+ * Return: rounded rate in Hz, or -ve error code.
+ */
+ulong clk_round_rate(struct clk *clk, ulong rate);
+
+/**
+ * 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.
+ *
+ * Return: new rate, or -ve error code.
*/
ulong clk_set_rate(struct clk *clk, ulong rate);
/**
* clk_set_parent() - Set current clock parent.
- *
* @clk: A clock struct that was previously successfully requested by
* clk_request/get_by_*().
* @parent: A clock struct that was previously successfully requested by
* clk_request/get_by_*().
- * @return new rate, or -ve error code.
+ *
+ * Return: new rate, or -ve error code.
*/
int clk_set_parent(struct clk *clk, struct clk *parent);
/**
* clk_enable() - Enable (turn on) a clock.
- *
* @clk: A clock struct that was previously successfully requested by
* clk_request/get_by_*().
- * @return zero on success, or -ve error code.
+ *
+ * Return: zero on success, or -ve error code.
*/
int clk_enable(struct clk *clk);
/**
* clk_enable_bulk() - Enable (turn on) all clocks in a clock bulk struct.
- *
* @bulk: A clock bulk struct that was previously successfully requested
* by clk_get_bulk().
- * @return zero on success, or -ve error code.
+ *
+ * Return: zero on success, or -ve error code.
*/
int clk_enable_bulk(struct clk_bulk *bulk);
/**
* clk_disable() - Disable (turn off) a clock.
- *
* @clk: A clock struct that was previously successfully requested by
* clk_request/get_by_*().
- * @return zero on success, or -ve error code.
+ *
+ * Return: zero on success, or -ve error code.
*/
int clk_disable(struct clk *clk);
/**
* clk_disable_bulk() - Disable (turn off) all clocks in a clock bulk struct.
- *
* @bulk: A clock bulk struct that was previously successfully requested
* by clk_get_bulk().
- * @return zero on success, or -ve error code.
+ *
+ * Return: zero on success, or -ve error code.
*/
int clk_disable_bulk(struct clk_bulk *bulk);
* @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.
- *
- * Returns false otherwise. Note that two NULL clks are treated as matching.
+ * 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.
*/
bool clk_is_match(const struct clk *p, const struct clk *q);
-int soc_clk_dump(void);
-
-/**
- * clk_valid() - check if clk is valid
- *
- * @clk: the clock to check
- * @return true if valid, or false
- */
-static inline bool clk_valid(struct clk *clk)
-{
- return clk && !!clk->dev;
-}
-
/**
* 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
- * @return zero on success, or -ENOENT on error
+ *
+ * Return: zero on success, or -ENOENT on error
*/
int clk_get_by_id(ulong id, struct clk **clkp);
/**
* clk_dev_binded() - Check whether the clk has a device binded
+ * @clk: A pointer to the clk
*
- * @clk A pointer to the clk
- *
- * @return true on binded, or false on no
+ * Return: true on binded, or false on no
*/
bool clk_dev_binded(struct clk *clk);
+
+#else /* CONFIG_IS_ENABLED(CLK) */
+
+static inline int clk_request(struct udevice *dev, struct clk *clk)
+{
+ return -ENOSYS;
+}
+
+static inline void clk_free(struct clk *clk)
+{
+ return;
+}
+
+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;
+}
+
+static inline ulong clk_round_rate(struct clk *clk, ulong rate)
+{
+ return -ENOSYS;
+}
+
+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
+ *
+ * Return: true if valid, or false
+ */
+static inline bool clk_valid(struct clk *clk)
+{
+ return clk && !!clk->dev;
+}
+
+int soc_clk_dump(void);
+
#endif
#define clk_prepare_enable(clk) clk_enable(clk)
projects / platform / kernel / u-boot.git / blobdiff