[PATCH 7/9] command: allow runtime usage

[Jean-Christophe PLAGNIOL-VILLARD]

This will allow as example to list the currently supported digest.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
 common/command.c  | 2 ++
 include/command.h | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/common/command.c b/common/command.c
index 61191c2..dc2cb88 100644
--- a/common/command.c
+++ b/common/command.c
@@ -47,6 +47,8 @@ void barebox_cmd_usage(struct command *cmdtp)
 		puts(cmdtp->help);
 		putchar('\n');
 	}
+	if (cmdtp->usage)
+		cmdtp->usage();
 #endif
 }
 EXPORT_SYMBOL(barebox_cmd_usage);
diff --git a/include/command.h b/include/command.h
index 5d5bf53..3aca1a9 100644
--- a/include/command.h
+++ b/include/command.h
@@ -54,6 +54,7 @@ struct command {
 	uint32_t	group;
 #ifdef	CONFIG_LONGHELP
 	const char	*help;		/* Help  message	(long)	*/
+	void		(*usage)(void);
 #endif
 }
 #ifdef __x86_64__
@@ -115,8 +116,10 @@ static const __maybe_unused char cmd_##_name##_help[] =
 
 #ifdef CONFIG_LONGHELP
 #define BAREBOX_CMD_HELP(text)	.help = text,
+#define BAREBOX_CMD_USAGE(fn)	.usage = fn,
 #else
 #define BAREBOX_CMD_HELP(text)
+#define BAREBOX_CMD_USAGE(fn)
 #endif
 
 #define BAREBOX_CMD_GROUP(grp)	.group = grp,
-- 
2.1.4