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clk: Add driver API to HTML docs

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This converts the existing driver API docs (clk-uclass.h) to kernel doc
format and adds them to the HTML documentation. Because the kernel doc
sphinx converter does not handle functions in structs very well, the
individual methods are documented separately. This is primarily inspired by
the phylink documentation [1], which uses this trick extensively.

[1] https://www.kernel.org/doc/html/latest/networking/kapi.html#c.phylink_mac_ops

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/20211222171114.3091780-5-seanga2@gmail.com
This commit is contained in:
Sean Anderson 2021-12-22 12:11:13 -05:00
parent 9c88b13a90
commit a0abea867a
2 changed files with 115 additions and 78 deletions
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6
doc/api/clk.rst
View File

@ -11,3 +11,9 @@ Client API
.. kernel-doc:: include/clk.h
:internal:
Driver API
----------
.. kernel-doc:: include/clk-uclass.h
:internal:

187
include/clk-uclass.h
View File

@ -16,96 +16,127 @@ struct ofnode_phandle_args;
/**
* struct clk_ops - The functions that a clock driver must implement.
* @of_xlate: Translate a client's device-tree (OF) clock specifier.
* @request: Request a translated clock.
* @rfree: Free a previously requested clock.
* @round_rate: Adjust a rate to the exact rate a clock can provide.
* @get_rate: Get current clock rate.
* @set_rate: Set current clock rate.
* @set_parent: Set current clock parent
* @enable: Enable a clock.
* @disable: Disable a clock.
*
* The individual methods are described more fully below.
*/
struct clk_ops {
/**
* of_xlate - Translate a client's device-tree (OF) clock specifier.
*
* The clock core calls this function as the first step in implementing
* a client's clk_get_by_*() call.
*
* If this function pointer is set to NULL, the clock core will use a
* default implementation, which assumes #clock-cells = <1>, and that
* the DT cell contains a simple integer clock ID.
*
* At present, the clock API solely supports device-tree. If this
* changes, other xxx_xlate() functions may be added to support those
* other mechanisms.
*
* @clock: The clock struct to hold the translation result.
* @args: The clock specifier values from device tree.
* @return 0 if OK, or a negative error code.
*/
int (*of_xlate)(struct clk *clock,
struct ofnode_phandle_args *args);
/**
* request - Request a translated clock.
*
* The clock core calls this function as the second step in
* implementing a client's clk_get_by_*() call, following a successful
* xxx_xlate() call, or as the only step in implementing a client's
* clk_request() call.
*
* @clock: The clock struct to request; this has been fille in by
* a previoux xxx_xlate() function call, or by the caller
* of clk_request().
* @return 0 if OK, or a negative error code.
*/
int (*request)(struct clk *clock);
/**
* rfree - Free a previously requested clock.
*
* This is the implementation of the client clk_free() API.
*
* @clock: The clock to free.
* @return 0 if OK, or a negative error code.
*/
int (*rfree)(struct clk *clock);
/**
* round_rate() - Adjust a rate to the exact rate a clock can provide.
*
* @clk: The clock to manipulate.
* @rate: Desidered clock rate in Hz.
* @return rounded rate in Hz, or -ve error code.
*/
ulong (*round_rate)(struct clk *clk, ulong rate);
/**
* get_rate() - Get current clock rate.
*
* @clk: The clock to query.
* @return clock rate in Hz, or -ve error code
*/
ulong (*get_rate)(struct clk *clk);
/**
* set_rate() - Set current clock rate.
*
* @clk: The clock to manipulate.
* @rate: New clock rate in Hz.
* @return new rate, or -ve error code.
*/
ulong (*set_rate)(struct clk *clk, ulong rate);
/**
* set_parent() - Set current clock parent
*
* @clk: The clock to manipulate.
* @parent: New clock parent.
* @return zero on success, or -ve error code.
*/
int (*set_parent)(struct clk *clk, struct clk *parent);
/**
* enable() - Enable a clock.
*
* @clk: The clock to manipulate.
* @return zero on success, or -ve error code.
*/
int (*enable)(struct clk *clk);
/**
* disable() - Disable a clock.
*
* @clk: The clock to manipulate.
* @return zero on success, or -ve error code.
*/
int (*disable)(struct clk *clk);
};
#if 0 /* For documentation only */
/**
* of_xlate() - Translate a client's device-tree (OF) clock specifier.
* @clock: The clock struct to hold the translation result.
* @args: The clock specifier values from device tree.
*
* The clock core calls this function as the first step in implementing
* a client's clk_get_by_*() call.
*
* If this function pointer is set to NULL, the clock core will use a
* default implementation, which assumes #clock-cells = <1>, and that
* the DT cell contains a simple integer clock ID.
*
* At present, the clock API solely supports device-tree. If this
* changes, other xxx_xlate() functions may be added to support those
* other mechanisms.
*
* Return: 0 if OK, or a negative error code.
*/
int of_xlate(struct clk *clock, struct ofnode_phandle_args *args);
/**
* request() - Request a translated clock.
* @clock: The clock struct to request; this has been fille in by
* a previoux xxx_xlate() function call, or by the caller
* of clk_request().
*
* The clock core calls this function as the second step in
* implementing a client's clk_get_by_*() call, following a successful
* xxx_xlate() call, or as the only step in implementing a client's
* clk_request() call.
*
* Return: 0 if OK, or a negative error code.
*/
int request(struct clk *clock);
/**
* rfree() - Free a previously requested clock.
* @clock: The clock to free.
*
* This is the implementation of the client clk_free() API.
*
* Return: 0 if OK, or a negative error code.
*/
int rfree(struct clk *clock);
/**
* round_rate() - Adjust a rate to the exact rate a clock can provide.
* @clk: The clock to manipulate.
* @rate: Desidered clock rate in Hz.
*
* Return: rounded rate in Hz, or -ve error code.
*/
ulong round_rate(struct clk *clk, ulong rate);
/**
* get_rate() - Get current clock rate.
* @clk: The clock to query.
*
* Return: clock rate in Hz, or -ve error code
*/
ulong get_rate(struct clk *clk);
/**
* set_rate() - Set current clock rate.
* @clk: The clock to manipulate.
* @rate: New clock rate in Hz.
*
* Return: new rate, or -ve error code.
*/
ulong set_rate(struct clk *clk, ulong rate);
/**
* set_parent() - Set current clock parent
* @clk: The clock to manipulate.
* @parent: New clock parent.
*
* Return: zero on success, or -ve error code.
*/
int set_parent(struct clk *clk, struct clk *parent);
/**
* enable() - Enable a clock.
* @clk: The clock to manipulate.
*
* Return: zero on success, or -ve error code.
*/
int enable(struct clk *clk);
/**
* disable() - Disable a clock.
* @clk: The clock to manipulate.
*
* Return: zero on success, or -ve error code.
*/
int disable(struct clk *clk);
#endif
#endif