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Date: Wed, 1 Apr 2020 20:36:40 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Florian Fainelli <f.fainelli@...il.com>, hsinyi@...omium.org,
geert+renesas@...der.be, will@...nel.org, swboyd@...omium.org,
robh@...nel.org, tytso@....edu
Subject: [PATCH] Documentation: dt-bindings: Document 'rng-seed' for /chosen
The /chosen node can have a 'rng-seed' property read as a u32 quantity
which would contain a random number provided by the boot agent. This is
useful in configurations where the kernel does not have access to a
random number generator.
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
Documentation/devicetree/bindings/chosen.txt | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/Documentation/devicetree/bindings/chosen.txt b/Documentation/devicetree/bindings/chosen.txt
index 45e79172a646..126b31eecfeb 100644
--- a/Documentation/devicetree/bindings/chosen.txt
+++ b/Documentation/devicetree/bindings/chosen.txt
@@ -28,6 +28,19 @@ mode) when EFI_RNG_PROTOCOL is supported, it will be overwritten by
the Linux EFI stub (which will populate the property itself, using
EFI_RNG_PROTOCOL).
+rng-seed
+--------
+
+This property is used to initialize the kernel's entropy pool from a
+trusted boot agent capable of providing a random number. It is parsed
+as a u32 value, e.g.
+
+/ {
+ chosen {
+ rng-seed = <0xcafef00d>;
+ };
+};
+
stdout-path
-----------
--
2.17.1
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