Standardize command usage messages with cmd_usage()

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/drivers/gpio/pca953x.c b/drivers/gpio/pca953x.c
index 390d99a..f80baeb 100644
--- a/drivers/gpio/pca953x.c
+++ b/drivers/gpio/pca953x.c
@@ -164,7 +164,7 @@
 	if (!c || !((argc == (c->maxargs)) ||
 		(((int)c->cmd == PCA953X_CMD_DEVICE) &&
 		 (argc == (c->maxargs - 1))))) {
-		printf("Usage:\n%s\n", cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}
 
diff --git a/drivers/misc/ds4510.c b/drivers/misc/ds4510.c
index 4cd2fc2..958ff68 100644
--- a/drivers/misc/ds4510.c
+++ b/drivers/misc/ds4510.c
@@ -294,7 +294,7 @@
 	if (!c || !((argc == (c->maxargs)) ||
 		(((int)c->cmd == DS4510_CMD_DEVICE) &&
 		 (argc == (c->maxargs - 1))))) {
-		printf("Usage:\n%s\n", cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}
 
@@ -371,7 +371,7 @@
 	} else if (strcmp(argv[2], "write") == 0) {
 		rw_func = ds4510_mem_write;
 	} else {
-		printf("Usage:\n%s\n", cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}
 
diff --git a/drivers/qe/qe.c b/drivers/qe/qe.c
index e914d01..7b29fd7 100644
--- a/drivers/qe/qe.c
+++ b/drivers/qe/qe.c
@@ -425,7 +425,7 @@
 	ulong addr;
 
 	if (argc < 3) {
-		printf ("Usage:\n%s\n", cmdtp->usage);
+		cmd_usage(cmdtp);
 		return 1;
 	}
 
@@ -455,7 +455,7 @@
 		return qe_upload_firmware((const struct qe_firmware *) addr);
 	}
 
-	printf ("Usage:\n%s\n", cmdtp->usage);
+	cmd_usage(cmdtp);
 	return 1;
 }