From c194a38675eac13862ecb51d8a443a566fed97d4 Mon Sep 17 00:00:00 2001 From: David Brazdil Date: Wed, 26 Jan 2022 23:12:36 +0000 Subject: [PATCH] dt-bindings: reserved-memory: Open Profile for DICE Add DeviceTree bindings for Open Profile for DICE, an open protocol for measured boot. Firmware uses DICE to measure the hardware/software combination and generates Compound Device Identifier (CDI) certificates. These are stored in memory and the buffer is described in the DT as a reserved memory region compatible with 'google,open-dice'. 'no-map' is required to ensure the memory region is never treated by the kernel as system memory. Reviewed-by: Rob Herring Signed-off-by: David Brazdil Link: https://lore.kernel.org/r/20220126231237.529308-2-dbrazdil@google.com Signed-off-by: Greg Kroah-Hartman --- .../bindings/reserved-memory/google,open-dice.yaml | 46 ++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 Documentation/devicetree/bindings/reserved-memory/google,open-dice.yaml diff --git a/Documentation/devicetree/bindings/reserved-memory/google,open-dice.yaml b/Documentation/devicetree/bindings/reserved-memory/google,open-dice.yaml new file mode 100644 index 0000000..257a0b5 --- /dev/null +++ b/Documentation/devicetree/bindings/reserved-memory/google,open-dice.yaml @@ -0,0 +1,46 @@ +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/reserved-memory/google,open-dice.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Open Profile for DICE Device Tree Bindings + +description: | + This binding represents a reserved memory region containing data + generated by the Open Profile for DICE protocol. + + See https://pigweed.googlesource.com/open-dice/ + +maintainers: + - David Brazdil + +allOf: + - $ref: "reserved-memory.yaml" + +properties: + compatible: + const: google,open-dice + + reg: + description: page-aligned region of memory containing DICE data + +required: + - compatible + - reg + - no-map + +unevaluatedProperties: false + +examples: + - | + reserved-memory { + #address-cells = <2>; + #size-cells = <1>; + + dice: dice@12340000 { + compatible = "google,open-dice"; + reg = <0x00 0x12340000 0x2000>; + no-map; + }; + }; -- 2.7.4