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doc: Document timer API 

This adds kerneldocs for <timer.h>.

I don't know who should maintain doc/api/timer.rst, since the timer
subsystem seems to be maintained by SoC maintainers. MAINTAINERS is left
un-updated for the moment.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Sean Anderson 2020-10-07 14:37:43 -04:00 committed by Tom Rini
parent c670aeee3d
commit aff60aba6c
3 changed files with 33 additions and 22 deletions
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1
doc/api/index.rst
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@ -12,4 +12,5 @@ U-Boot API documentation
pinctrl
rng
serial
timer
unicode

8
doc/api/timer.rst Normal file
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@ -0,0 +1,8 @@
.. SPDX-License-Identifier: GPL-2.0+
.. Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
Timer Subsystem
===============
.. kernel-doc:: include/timer.h
:internal:

46
include/timer.h
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@ -6,12 +6,12 @@
#ifndef _TIMER_H_
#define _TIMER_H_
/*
* dm_timer_init - initialize a timer for time keeping. On success
/**
* dm_timer_init() - initialize a timer for time keeping. On success
* initializes gd->timer so that lib/timer can use it for future
* referrence.
*
* @return - 0 on success or error number
* Return: 0 on success or error number
*/
int dm_timer_init(void);
@ -30,49 +30,51 @@ int dm_timer_init(void);
*/
int timer_timebase_fallback(struct udevice *dev);
/*
* timer_conv_64 - convert 32-bit counter value to 64-bit
*
/**
* timer_conv_64() - convert 32-bit counter value to 64-bit
* @count: 32-bit counter value
* @return: 64-bit counter value
*
* Return: 64-bit counter value
*/
u64 timer_conv_64(u32 count);
/*
* Get the current timer count
*
/**
* timer_get_count() - Get the current timer count
* @dev: The timer device
* @count: pointer that returns the current timer count
* @return: 0 if OK, -ve on error
*
* Return: 0 if OK, -ve on error
*/
int timer_get_count(struct udevice *dev, u64 *count);
/*
* Get the timer input clock frequency
*
/**
* timer_get_rate() - Get the timer input clock frequency
* @dev: The timer device
* @return: the timer input clock frequency
*
* Return: the timer input clock frequency
*/
unsigned long timer_get_rate(struct udevice *dev);
/*
/**
* struct timer_ops - Driver model timer operations
*
* The uclass interface is implemented by all timer devices which use
* driver model.
*/
struct timer_ops {
/*
* Get the current timer count
/**
* @get_count: Get the current timer count
*
* @dev: The timer device
*
* @count: pointer that returns the current 64-bit timer count
* @return: 0 if OK, -ve on error
*
* Return: 0 if OK, -ve on error
*/
int (*get_count)(struct udevice *dev, u64 *count);
};
/*
/**
* struct timer_dev_priv - information about a device used by the uclass
*
* @clock_rate: the timer input clock frequency
@ -84,7 +86,7 @@ struct timer_dev_priv {
/**
* timer_early_get_count() - Implement timer_get_count() before driver model
*
* If CONFIG_TIMER_EARLY is enabled, this function wil be called to return
* If ``CONFIG_TIMER_EARLY`` is enabled, this function wil be called to return
* the current timer value before the proper driver model timer is ready.
* It should be implemented by one of the timer values. This is mostly useful
* for tracing.
@ -94,7 +96,7 @@ u64 timer_early_get_count(void);
/**
* timer_early_get_rate() - Get the timer rate before driver model
*
* If CONFIG_TIMER_EARLY is enabled, this function wil be called to return
* If ``CONFIG_TIMER_EARLY`` is enabled, this function wil be called to return
* the current timer rate in Hz before the proper driver model timer is ready.
* It should be implemented by one of the timer values. This is mostly useful
* for tracing. This corresponds to the clock_rate value in struct