cmd: mmc: update the mmc command's usage about argument

It's confusing whether arguments are optional or mandatory.
Update the command's usage to clarify how to use.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/cmd/mmc.c b/cmd/mmc.c
index 1529a3e..cb6b59f 100644 (file)
--- a/cmd/mmc.c
+++ b/cmd/mmc.c
@@ -1017,13 +1017,13 @@ U_BOOT_CMD(
        "  Power cycling is required to initialize partitions after set to complete.\n"
 #endif
 #ifdef CONFIG_SUPPORT_EMMC_BOOT
-       "mmc bootbus dev boot_bus_width reset_boot_bus_width boot_mode\n"
+       "mmc bootbus <dev> <boot_bus_width> <reset_boot_bus_width> <boot_mode>\n"
        " - Set the BOOT_BUS_WIDTH field of the specified device\n"
        "mmc bootpart-resize <dev> <boot part size MB> <RPMB part size MB>\n"
        " - Change sizes of boot and RPMB partitions of specified device\n"
-       "mmc partconf dev [boot_ack boot_partition partition_access]\n"
+       "mmc partconf <dev> [boot_ack boot_partition partition_access]\n"
        " - Show or change the bits of the PARTITION_CONFIG field of the specified device\n"
-       "mmc rst-function dev value\n"
+       "mmc rst-function <dev> <value>\n"
        " - Change the RST_n_FUNCTION field of the specified device\n"
        "   WARNING: This is a write-once field and 0 / 1 / 2 are the only valid values.\n"
 #endif