commands: reset: allow specifying reset by name

So far, we were fine by using the highest priority restart handler
whenever more than one was available. There are reasons to want to
configure this however:

 - When communicating with BootROM, e.g. to force boot from recovery
   mode: The reset chosen must not cause the reboot mode stored to
   volatile memory to vanish
 - When testing (undocumented) reset behavior, e.g. to analyze how
   the EFI reset behaves

Extend the reset command to support this. When no extra command line
option is supplied, the old behavior is maintained.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 26 insertions, 2 deletions

diff --git a/common/restart.c b/common/restart.c
index 0f9e03765d..2bf7b166b0 100644
--- a/common/restart.c
+++ b/common/restart.c
@@ -75,20 +75,33 @@ int restart_handler_register_fn(const char *name,
 }
 
 /**
- * restart_machine() - reset the whole system
+ * restart_handler_get_by_name() - reset the whole system
  */
-void __noreturn restart_machine(void)
+struct restart_handler *restart_handler_get_by_name(const char *name)
 {
 	struct restart_handler *rst = NULL, *tmp;
 	unsigned int priority = 0;
 
 	list_for_each_entry(tmp, &restart_handler_list, list) {
+		if (name && tmp->name && strcmp(name, tmp->name))
+			continue;
 		if (tmp->priority > priority) {
 			priority = tmp->priority;
 			rst = tmp;
 		}
 	}
 
+	return rst;
+}
+
+/**
+ * restart_machine() - reset the whole system
+ */
+void __noreturn restart_machine(void)
+{
+	struct restart_handler *rst;
+
+	rst = restart_handler_get_by_name(NULL);
 	if (rst) {
 		pr_debug("%s: using restart handler %s\n", __func__, rst->name);
 		console_flush();
@@ -112,3 +125,14 @@ unsigned int of_get_restart_priority(struct device_node *node)
 
 	return priority;
 }
+
+/*
+ * restart_handlers_print - print informations about all restart handlers
+ */
+void restart_handlers_print(void)
+{
+	struct restart_handler *tmp;
+
+	list_for_each_entry(tmp, &restart_handler_list, list)
+		printf("%-20s %6d\n", tmp->name, tmp->priority);
+}