[PATCH v2 21/22] doc: Add log kerneldocs to documentation

[Sean Anderson <seanga2@gmail.com>]

The functions in log.h are already mostly documented, so add them to the
generated documentation.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
---

Changes in v2:
- Add % before constants in kerneldocs
- Document log_level_t and log_category_t members

 doc/develop/logging.rst |   5 ++
 include/log.h           | 138 +++++++++++++++++++++++++---------------
 2 files changed, 92 insertions(+), 51 deletions(-)

diff --git a/doc/develop/logging.rst b/doc/develop/logging.rst
index 7ce8482ab6..6a22062073 100644
--- a/doc/develop/logging.rst
+++ b/doc/develop/logging.rst
@@ -288,3 +288,8 @@ information
 Add a command to add new log records and delete existing records.
 
 Provide additional log() functions - e.g. logc() to specify the category
+
+Logging API
+-----------
+.. kernel-doc:: include/log.h
+   :internal:
diff --git a/include/log.h b/include/log.h
index 9dd4484095..1aae3e3ef1 100644
--- a/include/log.h
+++ b/include/log.h
@@ -17,49 +17,81 @@
 
 struct cmd_tbl;
 
-/** Log levels supported, ranging from most to least important */
+/**
+ * enum log_level_t - Log levels supported, ranging from most to least important
+ */
 enum log_level_t {
-	LOGL_EMERG = 0,		/* U-Boot is unstable */
-	LOGL_ALERT,		/* Action must be taken immediately */
-	LOGL_CRIT,		/* Critical conditions */
-	LOGL_ERR,		/* Error that prevents something from working */
-	LOGL_WARNING,		/* Warning may prevent optimial operation */
-	LOGL_NOTICE,		/* Normal but significant condition, printf() */
-	LOGL_INFO,		/* General information message */
-	LOGL_DEBUG,		/* Basic debug-level message */
-	LOGL_DEBUG_CONTENT,	/* Debug message showing full message content */
-	LOGL_DEBUG_IO,		/* Debug message showing hardware I/O access */
+	/** @LOGL_EMERG: U-Boot is unstable */
+	LOGL_EMERG = 0,
+	/** @LOGL_ALERT: Action must be taken immediately */
+	LOGL_ALERT,
+	/** @LOGL_CRIT: Critical conditions */
+	LOGL_CRIT,
+	/** @LOGL_ERR: Error that prevents something from working */
+	LOGL_ERR,
+	/** @LOGL_WARNING: Warning may prevent optimial operation */
+	LOGL_WARNING,
+	/** @LOGL_NOTICE: Normal but significant condition, printf() */
+	LOGL_NOTICE,
+	/** @LOGL_INFO: General information message */
+	LOGL_INFO,
+	/** @LOGL_DEBUG: Basic debug-level message */
+	LOGL_DEBUG,
+	/** @LOGL_DEBUG_CONTENT: Debug message showing full message content */
+	LOGL_DEBUG_CONTENT,
+	/** @LOGL_DEBUG_IO: Debug message showing hardware I/O access */
+	LOGL_DEBUG_IO,
 
+	/** @LOGL_COUNT: Total number of valid log levels */
 	LOGL_COUNT,
+	/** @LOGL_NONE: Used to indicate that there is no valid log level */
 	LOGL_NONE,
 
+	/** @LOGL_FIRST: The first, most-important log level */
 	LOGL_FIRST = LOGL_EMERG,
+	/** @LOGL_MAX: The last, least-important log level */
 	LOGL_MAX = LOGL_DEBUG_IO,
 };
 
 /**
- * Log categories supported. Most of these correspond to uclasses (i.e.
- * enum uclass_id) but there are also some more generic categories
+ * enum log_category_t - Log categories supported.
+ *
+ * Log categories between %LOGC_FIRST and %LOGC_NONE correspond to uclasses
+ * (i.e. &enum uclass_id), but there are also some more generic categories.
  */
 enum log_category_t {
+	/** @LOGC_FIRST: First log category */
 	LOGC_FIRST = 0,	/* First part mirrors UCLASS_... */
 
+	/** @LOGC_NONE: Default log category */
 	LOGC_NONE = UCLASS_COUNT,	/* First number is after all uclasses */
-	LOGC_ARCH,	/* Related to arch-specific code */
-	LOGC_BOARD,	/* Related to board-specific code */
-	LOGC_CORE,	/* Related to core features (non-driver-model) */
-	LOGC_DM,	/* Core driver-model */
-	LOGC_DT,	/* Device-tree */
-	LOGC_EFI,	/* EFI implementation */
-	LOGC_ALLOC,	/* Memory allocation */
-	LOGC_SANDBOX,	/* Related to the sandbox board */
-	LOGC_BLOBLIST,	/* Bloblist */
-	LOGC_DEVRES,	/* Device resources (devres_... functions) */
-	/* Advanced Configuration and Power Interface (ACPI) */
+	/** @LOGC_ARCH: Related to arch-specific code */
+	LOGC_ARCH,
+	/** @LOGC_BOARD: Related to board-specific code */
+	LOGC_BOARD,
+	/** @LOGC_CORE: Related to core features (non-driver-model) */
+	LOGC_CORE,
+	/** @LOGC_DM: Core driver-model */
+	LOGC_DM,
+	/** @LOGC_DT: Device-tree */
+	LOGC_DT,
+	/** @LOGC_EFI: EFI implementation */
+	LOGC_EFI,
+	/** @LOGC_ALLOC: Memory allocation */
+	LOGC_ALLOC,
+	/** @LOGC_SANDBOX: Related to the sandbox board */
+	LOGC_SANDBOX,
+	/** @LOGC_BLOBLIST: Bloblist */
+	LOGC_BLOBLIST,
+	/** @LOGC_DEVRES: Device resources (``devres_...`` functions) */
+	LOGC_DEVRES,
+	/** @LOGC_ACPI: Advanced Configuration and Power Interface (ACPI) */
 	LOGC_ACPI,
 
-	LOGC_COUNT,	/* Number of log categories */
-	LOGC_END,	/* Sentinel value for a list of log categories */
+	/** @LOGC_COUNT: Number of log categories */
+	LOGC_COUNT,
+	/** @LOGC_END: Sentinel value for lists of log categories */
+	LOGC_END,
 };
 
 /* Helper to cast a uclass ID to a log category */
@@ -78,7 +110,7 @@ static inline int log_uc_cat(enum uclass_id id)
  * @func: Function where log record was generated
  * @fmt: printf() format string for log record
  * @...: Optional parameters, according to the format string @fmt
- * @return 0 if log record was emitted, -ve on error
+ * Return: 0 if log record was emitted, -ve on error
  */
 int _log(enum log_category_t cat, enum log_level_t level, const char *file,
 	 int line, const char *func, const char *fmt, ...)
@@ -231,7 +263,7 @@ void __assert_fail(const char *assertion, const char *file, unsigned int line,
  * full pathname as it may be huge. Only use this when the user should be
  * warning, similar to BUG_ON() in linux.
  *
- * @return true if assertion succeeded (condition is true), else false
+ * Return: true if assertion succeeded (condition is true), else false
  */
 #define assert_noisy(x) \
 	({ bool _val = (x); \
@@ -304,8 +336,9 @@ struct log_device;
  */
 struct log_driver {
 	const char *name;
+
 	/**
-	 * emit() - emit a log record
+	 * @emit: emit a log record
 	 *
 	 * Called by the log system to pass a log record to a particular driver
 	 * for processing. The filter is checked before calling this function.
@@ -359,11 +392,11 @@ enum log_filter_flags {
  * @filter_num: Sequence number of this filter.  This is returned when adding a
  *	new filter, and must be provided when removing a previously added
  *	filter.
- * @flags: Flags for this filter (LOGFF_...)
+ * @flags: Flags for this filter (``LOGFF_...``)
  * @cat_list: List of categories to allow (terminated by %LOGC_END). If empty
- *	then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
+ *	then all categories are permitted. Up to %LOGF_MAX_CATEGORIES entries
  *	can be provided
- * @level: Maximum (or minimum, if LOGFF_MIN_LEVEL) log level to allow
+ * @level: Maximum (or minimum, if %LOGFF_MIN_LEVEL) log level to allow
  * @file_list: List of files to allow, separated by comma. If NULL then all
  *	files are permitted
  * @sibling_node: Next filter in the list of filters for this log device
@@ -384,8 +417,8 @@ struct log_filter {
  * log_get_cat_name() - Get the name of a category
  *
  * @cat: Category to look up
- * @return category name (which may be a uclass driver name) if found, or
- *	 "<invalid>" if invalid, or "<missing>" if not found
+ * Return: category name (which may be a uclass driver name) if found, or
+ *	   "<invalid>" if invalid, or "<missing>" if not found
  */
 const char *log_get_cat_name(enum log_category_t cat);
 
@@ -393,7 +426,7 @@ const char *log_get_cat_name(enum log_category_t cat);
  * log_get_cat_by_name() - Look up a category by name
  *
  * @name: Name to look up
- * @return category ID, or LOGC_NONE if not found
+ * Return: Category, or %LOGC_NONE if not found
  */
 enum log_category_t log_get_cat_by_name(const char *name);
 
@@ -401,7 +434,7 @@ enum log_category_t log_get_cat_by_name(const char *name);
  * log_get_level_name() - Get the name of a log level
  *
  * @level: Log level to look up
- * @return log level name (in ALL CAPS)
+ * Return: Log level name (in ALL CAPS)
  */
 const char *log_get_level_name(enum log_level_t level);
 
@@ -409,7 +442,7 @@ const char *log_get_level_name(enum log_level_t level);
  * log_get_level_by_name() - Look up a log level by name
  *
  * @name: Name to look up
- * @return log level ID, or LOGL_NONE if not found
+ * Return: Log level, or %LOGL_NONE if not found
  */
 enum log_level_t log_get_level_by_name(const char *name);
 
@@ -417,7 +450,7 @@ enum log_level_t log_get_level_by_name(const char *name);
  * log_device_find_by_name() - Look up a log device by its driver's name
  *
  * @drv_name: Name of the driver
- * @return the log device, or NULL if not found
+ * Return: the log device, or %NULL if not found
  */
 struct log_device *log_device_find_by_name(const char *drv_name);
 
@@ -465,15 +498,16 @@ int do_log_test(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
  *
  * @drv_name: Driver name to add the filter to (since each driver only has a
  *	single device)
- * @flags: Flags for this filter (LOGFF_...)
+ * @flags: Flags for this filter (``LOGFF_...``)
  * @cat_list: List of categories to allow (terminated by %LOGC_END). If empty
- *	then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
+ *	then all categories are permitted. Up to %LOGF_MAX_CATEGORIES entries
  *	can be provided
- * @level: Maximum (or minimum, if LOGFF_LEVEL_MIN) log level to allow
+ * @level: Maximum (or minimum, if %LOGFF_LEVEL_MIN) log level to allow
  * @file_list: List of files to allow, separated by comma. If NULL then all
  *	files are permitted
- * @return the sequence number of the new filter (>=0) if the filter was added,
- *	or a -ve value on error
+ * Return:
+ *   the sequence number of the new filter (>=0) if the filter was added, or a
+ *   -ve value on error
  */
 int log_add_filter_flags(const char *drv_name, enum log_category_t cat_list[],
 			 enum log_level_t level, const char *file_list,
@@ -485,13 +519,14 @@ int log_add_filter_flags(const char *drv_name, enum log_category_t cat_list[],
  * @drv_name: Driver name to add the filter to (since each driver only has a
  *	single device)
  * @cat_list: List of categories to allow (terminated by %LOGC_END). If empty
- *	then all categories are permitted. Up to LOGF_MAX_CATEGORIES entries
+ *	then all categories are permitted. Up to %LOGF_MAX_CATEGORIES entries
  *	can be provided
  * @max_level: Maximum log level to allow
- * @file_list: List of files to allow, separated by comma. If NULL then all
+ * @file_list: List of files to allow, separated by comma. If %NULL then all
  *	files are permitted
- * @return the sequence number of the new filter (>=0) if the filter was added,
- *	or a -ve value on error
+ * Return:
+ *   the sequence number of the new filter (>=0) if the filter was added, or a
+ *   -ve value on error
  */
 static inline int log_add_filter(const char *drv_name,
 				 enum log_category_t cat_list[],
@@ -508,8 +543,9 @@ static inline int log_add_filter(const char *drv_name,
  * @drv_name: Driver name to remove the filter from (since each driver only has
  *	a single device)
  * @filter_num: Filter number to remove (as returned by log_add_filter())
- * @return 0 if the filter was removed, -ENOENT if either the driver or the
- *	filter number was not found
+ * Return:
+ *   0 if the filter was removed, -%ENOENT if either the driver or the filter
+ *   number was not found
  */
 int log_remove_filter(const char *drv_name, int filter_num);
 
@@ -517,7 +553,7 @@ int log_remove_filter(const char *drv_name, int filter_num);
 /**
  * log_init() - Set up the log system ready for use
  *
- * @return 0 if OK, -ENOMEM if out of memory
+ * Return: 0 if OK, -%ENOMEM if out of memory
  */
 int log_init(void);
 #else
@@ -531,7 +567,7 @@ static inline int log_init(void)
  * log_get_default_format() - get default log format
  *
  * The default log format is configurable via
- * CONFIG_LOGF_FILE, CONFIG_LOGF_LINE, CONFIG_LOGF_FUNC.
+ * %CONFIG_LOGF_FILE, %CONFIG_LOGF_LINE, and %CONFIG_LOGF_FUNC.
  *
  * Return:	default log format
  */
-- 
2.28.0