[PATCH v2 2/6] reset: Add explicit cold reset support

[dmukhin at ford.com]

From: Denis Mukhin <dmukhin at ford.com> 

Some prototype boards default to a non-cold reset type, e.g. warm reset.

Add `reset -c` so users can excplicitly request a cold reset when needed.

Signed-off-by: Denis Mukhin <dmukhin at ford.com>
---
Changes since v1:
- corrected args parsing in do_reset()
- updated commit message
- fixup reset command description
---
 cmd/boot.c                         |  3 ++-
 drivers/sysreset/sysreset-uclass.c | 13 +++++++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/cmd/boot.c b/cmd/boot.c
index 29cdf4a9a81a..2cef907e291e 100644
--- a/cmd/boot.c
+++ b/cmd/boot.c
@@ -59,13 +59,14 @@ U_BOOT_CMD(
 U_BOOT_CMD(
 	reset, 2, 0,	do_reset,
 	"Perform RESET of the CPU",
-	"- cold boot without level specifier\n"
+	"- reset without level specifier\n"
 #if IS_ENABLED(CONFIG_SYSRESET_CMD_RESET_ARGS)
 // All options handled by sysreset drivers via their sysreset_ops.request_arg callback
 #ifdef CONFIG_SYSRESET_QCOM_PSCI
 	"reset -edl - Boot to Emergency DownLoad mode\n"
 #endif
 #endif
+	"reset -c - cold reset if implemented\n"
 	"reset -w - warm reset if implemented"
 );
 
diff --git a/drivers/sysreset/sysreset-uclass.c b/drivers/sysreset/sysreset-uclass.c
index d2fddb470bf1..df68b5c3f9eb 100644
--- a/drivers/sysreset/sysreset-uclass.c
+++ b/drivers/sysreset/sysreset-uclass.c
@@ -174,8 +174,17 @@ int do_reset(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 	if (argc > 2)
 		return CMD_RET_USAGE;
 
-	if (argc == 2 && argv[1][0] == '-' && argv[1][1] == 'w') {
-		reset_type = SYSRESET_WARM;
+	if (argc == 2 && argv[1][0] == '-') {
+		switch (argv[1][1]) {
+		case 'c':
+			reset_type = SYSRESET_COLD;
+			break;
+		case 'w':
+			reset_type = SYSRESET_WARM;
+			break;
+		default:
+			return CMD_RET_USAGE;
+		}
 	}
 
 	printf("resetting ...\n");
-- 
2.54.0