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From: Andrey Smirnov <andrew.smirnov@gmail.com>
To: barebox@lists.infradead.org
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Subject: [PATCH v3 4/4] common: oftree: Pass reset source and reset source instance to kernel
Date: Thu, 17 May 2018 14:29:17 -0700	[thread overview]
Message-ID: <20180517212917.3628-5-andrew.smirnov@gmail.com> (raw)
In-Reply-To: <20180517212917.3628-1-andrew.smirnov@gmail.com>

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 <andrew.smirnov@gmail.com>
---
 common/oftree.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/common/oftree.c b/common/oftree.c
index a38dfff29..5bb5420a7 100644
--- 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);
 }
 
-- 
2.17.0


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  parent reply	other threads:[~2018-05-17 21:29 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-17 21:29 [PATCH v3 0/4] Pass reset and boot sources via /chosen node Andrey Smirnov
2018-05-17 21:29 ` [PATCH v3 1/4] of: Make of_property_get_value() public Andrey Smirnov
2018-05-17 21:29 ` [PATCH v3 2/4] bootsource: Add bootsource alias name API Andrey Smirnov
2018-05-17 21:29 ` [PATCH v3 3/4] common: oftree: Pass bootsource and bootsource instance to kernel Andrey Smirnov
2018-05-17 21:29 ` Andrey Smirnov [this message]
2018-05-22  7:17 ` [PATCH v3 0/4] Pass reset and boot sources via /chosen node Sascha Hauer

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