Documentation/devicetree/bindings/tpm/microsoft,ftpm.yaml

   1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/tpm/microsoft,ftpm.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Microsoft firmware-based Trusted Platform Module (fTPM)
   8
   9 maintainers:
  10   - Thirupathaiah Annapureddy <thiruan@microsoft.com>
  11   - Sasha Levin <sashal@kernel.org>
  12
  13 description: |
  14   Commodity CPU architectures, such as ARM and Intel CPUs, have started to
  15   offer trusted computing features in their CPUs aimed at displacing dedicated
  16   trusted hardware.  Unfortunately, these CPU architectures raise serious
  17   challenges to building trusted systems because they omit providing secure
  18   resources outside the CPU perimeter.
  19
  20   Microsoft's firmware-based TPM 2.0 (fTPM) leverages ARM TrustZone to overcome
  21   these challenges and provide software with security guarantees similar to
  22   those of dedicated trusted hardware.
  23
  24   https://www.microsoft.com/en-us/research/publication/ftpm-software-implementation-tpm-chip/
  25   https://github.com/Microsoft/ms-tpm-20-ref/tree/main/Samples/ARM32-FirmwareTPM
  26
  27 properties:
  28   compatible:
  29     const: microsoft,ftpm
  30
  31 required:
  32   - compatible
  33   - linux,sml-base
  34   - linux,sml-size
  35
  36 allOf:
  37   - $ref: tpm-common.yaml#
  38
  39 unevaluatedProperties: false
  40
  41 examples:
  42   - |
  43     tpm {
  44         compatible = "microsoft,ftpm";
  45         linux,sml-base = <0x0 0xc0000000>;
  46         linux,sml-size = <0x10000>;
  47     };