Add an optional argument to the -p option that allows printing all
information related to a given entity. This may be handy sometimes if only
a single entity is of interest and there are many entities.

Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
---
 utils/media-ctl/media-ctl.c | 26 +++++++++++++++-----------
 utils/media-ctl/options.c   |  9 ++++++---
 utils/media-ctl/options.h   |  1 +
 3 files changed, 22 insertions(+), 14 deletions(-)

diff --git a/utils/media-ctl/media-ctl.c b/utils/media-ctl/media-ctl.c
index 0499008..fdd2449 100644
--- a/utils/media-ctl/media-ctl.c
+++ b/utils/media-ctl/media-ctl.c
@@ -504,14 +504,6 @@ static void media_print_topology_text(struct media_device 
*media)
                        media, media_get_entity(media, i));
 }
 
-void media_print_topology(struct media_device *media, int dot)
-{
-       if (dot)
-               media_print_topology_dot(media);
-       else
-               media_print_topology_text(media);
-}
-
 int main(int argc, char **argv)
 {
        struct media_device *media;
@@ -611,9 +603,21 @@ int main(int argc, char **argv)
                }
        }
 
-       if (media_opts.print || media_opts.print_dot) {
-               media_print_topology(media, media_opts.print_dot);
-               printf("\n");
+       if (media_opts.print_dot) {
+               media_print_topology_dot(media);
+       } else if (media_opts.print_entity) {
+               struct media_entity *entity = NULL;
+
+               entity = media_get_entity_by_name(media,
+                                                 media_opts.print_entity);
+               if (entity == NULL) {
+                       printf("Entity '%s' not found\n",
+                              media_opts.print_entity);
+                       goto out;
+               }
+               media_print_topology_text_entity(media, entity);
+       } else if (media_opts.print) {
+               media_print_topology_text(media);
        }
 
        if (media_opts.reset) {
diff --git a/utils/media-ctl/options.c b/utils/media-ctl/options.c
index a288a1b..3352626 100644
--- a/utils/media-ctl/options.c
+++ b/utils/media-ctl/options.c
@@ -51,7 +51,9 @@ static void usage(const char *argv0)
        printf("-i, --interactive       Modify links interactively\n");
        printf("-l, --links links       Comma-separated list of link 
descriptors to setup\n");
        printf("    --known-mbus-fmts   List known media bus formats and their 
numeric values\n");
-       printf("-p, --print-topology    Print the device topology\n");
+       printf("-p, --print-topology [name] Print the device topology\n");
+       printf("                        If entity name is specified, 
information to that entity\n");
+       printf("                        only is printed.\n");
        printf("    --print-dot         Print the device topology as a dot 
graph\n");
        printf("-r, --reset             Reset all links to inactive\n");
        printf("-v, --verbose           Be verbose\n");
@@ -109,7 +111,7 @@ static struct option opts[] = {
        {"links", 1, 0, 'l'},
        {"known-mbus-fmts", 0, 0, OPT_LIST_KNOWN_MBUS_FMTS},
        {"print-dot", 0, 0, OPT_PRINT_DOT},
-       {"print-topology", 0, 0, 'p'},
+       {"print-topology", 2, 0, 'p'},
        {"reset", 0, 0, 'r'},
        {"verbose", 0, 0, 'v'},
        { },
@@ -146,7 +148,7 @@ int parse_cmdline(int argc, char **argv)
        }
 
        /* parse options */
-       while ((opt = getopt_long(argc, argv, "d:e:f:hil:prvV:",
+       while ((opt = getopt_long(argc, argv, "d:e:f:hil:p::rvV:",
                                  opts, NULL)) != -1) {
                switch (opt) {
                case 'd':
@@ -182,6 +184,7 @@ int parse_cmdline(int argc, char **argv)
 
                case 'p':
                        media_opts.print = 1;
+                       media_opts.print_entity = optarg;
                        break;
 
                case 'r':
diff --git a/utils/media-ctl/options.h b/utils/media-ctl/options.h
index 9b5f314..ff9dfdf 100644
--- a/utils/media-ctl/options.h
+++ b/utils/media-ctl/options.h
@@ -30,6 +30,7 @@ struct media_options
                     print_dot:1,
                     reset:1,
                     verbose:1;
+       const char *print_entity;
        const char *entity;
        const char *formats;
        const char *links;
-- 
2.7.4

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