Since commit 5b9d44df2307f (mkimage: Display a better list of available image
types) mkimage usage text suggest to "use -T to see a list of available image
types". Unfortunately, commit 02221f29deb8 (mkimage: Convert to use getopt())
broke that feature, because getopt() fails when -T has no option argument.

Add a pseudo image type name 'list' that lists all image types. Update the
usage text accordingly.

Cc: Simon Glass <[email protected]>
Signed-off-by: Baruch Siach <[email protected]>
---
v2: Use 'list' pseudo type instead of getopt() optional argument
---
 tools/mkimage.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/tools/mkimage.c b/tools/mkimage.c
index d982bc5665f1..28ff35e670a3 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -113,7 +113,7 @@ static void usage(const char *msg)
 #endif
        fprintf(stderr, "       %s -V ==> print version information and exit\n",
                params.cmdname);
-       fprintf(stderr, "Use -T to see a list of available image types\n");
+       fprintf(stderr, "Use '-T list' to see a list of available image 
types\n");
 
        exit(EXIT_FAILURE);
 }
@@ -260,6 +260,10 @@ static void process_args(int argc, char **argv)
                        params.skipcpy = 1;
                        break;
                case 'T':
+                       if (strcmp(optarg, "list") == 0) {
+                               show_valid_options(IH_TYPE);
+                               exit(EXIT_SUCCESS);
+                       }
                        type = genimg_get_type_id(optarg);
                        if (type < 0) {
                                show_valid_options(IH_TYPE);
-- 
2.11.0

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