| 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/tcg,tpm-tis-i2c.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: I²C-attached Trusted Platform Module conforming to TCG TIS specification |
| 8 | |
| 9 | maintainers: |
| 10 | - Lukas Wunner <lukas@wunner.de> |
| 11 | |
| 12 | description: | |
| 13 | The Trusted Computing Group (TCG) has defined a multi-vendor standard |
| 14 | for accessing a TPM chip. It can be transported over various buses, |
| 15 | one of them being I²C. The standard is named: |
| 16 | TCG PC Client Specific TPM Interface Specification (TIS) |
| 17 | https://trustedcomputinggroup.org/resource/pc-client-work-group-pc-client-specific-tpm-interface-specification-tis/ |
| 18 | |
| 19 | The I²C interface was not originally part of the standard, but added |
| 20 | in 2017 with a separate document: |
| 21 | TCG PC Client Platform TPM Profile Specification for TPM 2.0 (PTP) |
| 22 | https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/ |
| 23 | |
| 24 | Recent TPM 2.0 chips conform to this generic interface, others use a |
| 25 | vendor-specific I²C interface. |
| 26 | |
| 27 | properties: |
| 28 | compatible: |
| 29 | oneOf: |
| 30 | - description: Generic TPM 2.0 chips conforming to TCG PTP interface |
| 31 | items: |
| 32 | - enum: |
| 33 | - infineon,slb9673 |
| 34 | - nuvoton,npct75x |
| 35 | - const: tcg,tpm-tis-i2c |
| 36 | |
| 37 | - description: TPM 1.2 and 2.0 chips with vendor-specific I²C interface |
| 38 | items: |
| 39 | - enum: |
| 40 | - atmel,at97sc3204t # TPM 1.2 |
| 41 | - infineon,slb9635tt # TPM 1.2 (maximum 100 kHz) |
| 42 | - infineon,slb9645tt # TPM 1.2 (maximum 400 kHz) |
| 43 | - infineon,tpm_i2c_infineon # TPM 1.2 |
| 44 | - nuvoton,npct501 # TPM 1.2 |
| 45 | - nuvoton,npct601 # TPM 2.0 |
| 46 | - st,st33zp24-i2c # TPM 2.0 |
| 47 | - winbond,wpct301 # TPM 1.2 |
| 48 | |
| 49 | reg: |
| 50 | description: address of TPM on the I²C bus |
| 51 | |
| 52 | allOf: |
| 53 | - $ref: tpm-common.yaml# |
| 54 | |
| 55 | required: |
| 56 | - compatible |
| 57 | - reg |
| 58 | |
| 59 | unevaluatedProperties: false |
| 60 | |
| 61 | examples: |
| 62 | - | |
| 63 | i2c { |
| 64 | #address-cells = <1>; |
| 65 | #size-cells = <0>; |
| 66 | |
| 67 | tpm@57 { |
| 68 | label = "tpm"; |
| 69 | compatible = "nuvoton,npct601"; |
| 70 | reg = <0x57>; |
| 71 | linux,sml-base = <0x7f 0xfd450000>; |
| 72 | linux,sml-size = <0x10000>; |
| 73 | }; |
| 74 | }; |
| 75 | |
| 76 | - | |
| 77 | #include <dt-bindings/gpio/gpio.h> |
| 78 | #include <dt-bindings/interrupt-controller/irq.h> |
| 79 | i2c { |
| 80 | #address-cells = <1>; |
| 81 | #size-cells = <0>; |
| 82 | |
| 83 | tpm@13 { |
| 84 | reg = <0x13>; |
| 85 | compatible = "st,st33zp24-i2c"; |
| 86 | interrupt-parent = <&gpio5>; |
| 87 | interrupts = <7 IRQ_TYPE_LEVEL_HIGH>; |
| 88 | lpcpd-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>; |
| 89 | }; |
| 90 | }; |