common: oftree: Pass reset source and reset source instance to kernel

Detecting reset reason is, in some cases, a destructive operation and in such cases it is impossible to obtain that information in the kernel without some help from barebox. Pass reset source and reset source instance to kernel to Linux to make it availible to Linux userspace. This info is placeed under /chosen/bootsource and it can be read under Linux in /sys/firmware/devicetree/base/chosen/reset-source. and /sys/firmware/devicetree/base/chosen/reset-source-instance. Signed-off-by: Andrey Smirnov <[email protected]> Signed-off-by: Sascha Hauer <[email protected]>
ndreys · May 18, 2018 · 58243d9 · 58243d9
1 parent 89677d1
commit 58243d9
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/common/oftree.c b/common/oftree.c
@@ -13,6 +13,7 @@
 #include <boot.h>
 #include <bootsource.h>
 #include <i2c/i2c.h>
+#include <reset_source.h>
 
 #define MAX_LEVEL	32		/* how deeply nested we will go */
 
@@ -158,6 +159,10 @@ static int of_fixup_bootargs(struct device_node *root, void *unused)
 	if (err)
 		return err;
 
+	of_property_write_string(node, "reset-source", reset_source_name());
+	of_property_write_u32(node, "reset-source-instance",
+			      reset_source_get_instance());
+
 	return of_fixup_bootargs_bootsource(root, node);
 }