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SubjectRe: [PATCH v3 1/2] dt-bindings: firmware: Add Open Profile for DICE
On Mon, Dec 13, 2021 at 07:58:32PM +0000, David Brazdil wrote:
> 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 referenced by a compatible device node.
>
> Signed-off-by: David Brazdil <dbrazdil@google.com>
> ---
> .../bindings/firmware/google,open-dice.yaml | 51 +++++++++++++++++++
> 1 file changed, 51 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/firmware/google,open-dice.yaml
>
> diff --git a/Documentation/devicetree/bindings/firmware/google,open-dice.yaml b/Documentation/devicetree/bindings/firmware/google,open-dice.yaml
> new file mode 100644
> index 000000000000..1aa69f381b8c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/google,open-dice.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/firmware/google,open-dice.yaml#
> +$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 <dbrazdil@google.com>
> +
> +properties:
> + compatible:
> + enum:
> + - google,open-dice
> +
> + memory-region:
> + maxItems: 1
> + description: |
> + phandle to the reserved memory node to be associated with the device
> + The reserved memory node should be defined as per the bindings,
> + Documentation/devicetree/bindings/reserved-memory/reserved-memory.yaml
> +
> +required:
> + - compatible
> + - memory-region
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + reserved-memory {
> + #address-cells = <2>;
> + #size-cells = <1>;
> +
> + dice_reserved: dice@12340000 {
> + reg = <0x00 0x12340000 0x2000>;
> + no-map;
> + };
> + };
> +
> + dice {
> + compatible = "google,open-dice";
> + memory-region = <&dice_reserved>;
There's no need for this indirection. Just add the compatible to the
dice@12340000 node. You can bind drivers to /reserved-memory nodes.
Rob

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