[PATCH v2] cmd: add a panic command

[Heiko Stuebner]

From: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>

Even in boot scripts it may be needed to "panic" when all options
are exhausted and the device specification specifies hanging
instead of resetting the board.

So add a new panic command that just wraps around the core panic
call in U-Boot and can take an optional message.

Signed-off-by: Heiko Stuebner <heiko.stuebner at theobroma-systems.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
changes in v2:
- add blank line before return (Simon)
- fix U-Boot spelling (Simon)

 cmd/Makefile |  1 +
 cmd/panic.c  | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 cmd/panic.c

diff --git a/cmd/Makefile b/cmd/Makefile
index ac843b4b16..027fa9083a 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -8,6 +8,7 @@ ifndef CONFIG_SPL_BUILD
 obj-y += boot.o
 obj-$(CONFIG_CMD_BOOTM) += bootm.o
 obj-y += help.o
+obj-y += panic.o
 obj-y += version.o
 
 # command
diff --git a/cmd/panic.c b/cmd/panic.c
new file mode 100644
index 0000000000..329231fb66
--- /dev/null
+++ b/cmd/panic.c
@@ -0,0 +1,23 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2020 Theobroma Systems Design und Consulting GmbH
+ */
+
+#include <common.h>
+#include <command.h>
+
+static int do_panic(cmd_tbl_t *cmdtp, int flag, int argc,
+		    char * const argv[])
+{
+	char *text = (argc < 2) ? "" : argv[1];
+
+	panic(text);
+
+	return CMD_RET_SUCCESS;
+}
+
+U_BOOT_CMD(
+	panic,	2,	1,	do_panic,
+	"Panic with optional message",
+	"[message]"
+);
-- 
2.26.2