| Tom Rini | 93743d2 | 2024-04-01 09:08:13 -0400 | [diff] [blame] | 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 | }; |