From: Marek Behún <marek.behun@nic.cz>
Date: Mon, 1 Jun 2020 21:00:50 +0000 (+0200)
Subject: firmware: turris-mox-rwtm: add debugfs documentation
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=e6e57b663ea13e595f0c1fc310959f4e44dbf601;p=linux.git

firmware: turris-mox-rwtm: add debugfs documentation

Add debugfs ABI documentation for the ECDSA signatures.

Signed-off-by: Marek Behún <marek.behun@nic.cz>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
---

diff --git a/Documentation/ABI/testing/debugfs-turris-mox-rwtm b/Documentation/ABI/testing/debugfs-turris-mox-rwtm
new file mode 100644
index 0000000000000..2b3255ee68fd6
--- /dev/null
+++ b/Documentation/ABI/testing/debugfs-turris-mox-rwtm
@@ -0,0 +1,9 @@
+What:		/sys/kernel/debug/turris-mox-rwtm/do_sign
+Date:		Jun 2020
+KernelVersion:	5.8
+Contact:	Marek Behún <marek.behun@nic.cz>
+Description:	(W) Message to sign with the ECDSA private key stored in
+		    device's OTP. The message must be exactly 64 bytes (since
+		    this is intended for SHA-512 hashes).
+		(R) The resulting signature, 136 bytes. This contains the R and
+		    S values of the ECDSA signature, both in big-endian format.