media-ctl: Document the --links option argument

The --links option take a mandatory argument. Document it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

diff --git a/utils/media-ctl/options.c b/utils/media-ctl/options.c
index 2e9851e..2135d93 100644 (file)
--- a/utils/media-ctl/options.c
+++ b/utils/media-ctl/options.c
@@ -41,7 +41,7 @@ static void usage(const char *argv0, int verbose)
        printf("    --get-v4l2 pad      Print the active format on a given pad\n");
        printf("-h, --help              Show verbose help and exit\n");
        printf("-i, --interactive       Modify links interactively\n");
-       printf("-l, --links             Comma-separated list of links descriptors to setup\n");
+       printf("-l, --links links       Comma-separated list of link descriptors to setup\n");
        printf("-p, --print-topology    Print the device topology\n");
        printf("    --print-dot         Print the device topology as a dot graph\n");
        printf("-r, --reset             Reset all links to inactive\n");
@@ -52,6 +52,7 @@ static void usage(const char *argv0, int verbose)
 
        printf("\n");
        printf("Links and formats are defined as\n");
+       printf("\tlinks           = link { ',' link } ;\n");
        printf("\tlink            = pad '->' pad '[' flags ']' ;\n");
        printf("\tpad             = entity ':' pad-number ;\n");
        printf("\tentity          = entity-number | ( '\"' entity-name '\"' ) ;\n");