cmd: spi: Judge the number of added parameters

When only sspi is entered, help information can be printed.

Signed-off-by: chenzhipeng <chenzhipeng@eswincomputing.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/cmd/spi.c b/cmd/spi.c
index 454ebe3..f30018f 100644 (file)
--- a/cmd/spi.c
+++ b/cmd/spi.c
@@ -112,6 +112,9 @@ int do_spi(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 
        if ((flag & CMD_FLAG_REPEAT) == 0)
        {
+               if (argc < 2)
+                       return CMD_RET_USAGE;
+
                if (argc >= 2) {
                        mode = CONFIG_DEFAULT_SPI_MODE;
                        bus = dectoul(argv[1], &cp);