92 lines · yaml
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)2%YAML 1.23---4$id: http://devicetree.org/schemas/tpm/tcg,tpm-tis-i2c.yaml#5$schema: http://devicetree.org/meta-schemas/core.yaml#6 7title: I²C-attached Trusted Platform Module conforming to TCG TIS specification8 9maintainers:10 - Lukas Wunner <lukas@wunner.de>11 12description: |13 The Trusted Computing Group (TCG) has defined a multi-vendor standard14 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 added20 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 a25 vendor-specific I²C interface.26 27properties:28 compatible:29 oneOf:30 - description: Generic TPM 2.0 chips conforming to TCG PTP interface31 items:32 - enum:33 - infineon,slb967334 - nuvoton,npct75x35 - st,st33ktpm2xi2c36 - const: tcg,tpm-tis-i2c37 38 - description: TPM 1.2 and 2.0 chips with vendor-specific I²C interface39 items:40 - enum:41 - atmel,at97sc3204t # TPM 1.242 - infineon,slb9635tt # TPM 1.2 (maximum 100 kHz)43 - infineon,slb9645tt # TPM 1.2 (maximum 400 kHz)44 - infineon,tpm_i2c_infineon # TPM 1.245 - nuvoton,npct501 # TPM 1.246 - nuvoton,npct601 # TPM 2.047 - st,st33zp24-i2c # TPM 2.048 - winbond,wpct301 # TPM 1.249 50 reg:51 description: address of TPM on the I²C bus52 53allOf:54 - $ref: tpm-common.yaml#55 56required:57 - compatible58 - reg59 60unevaluatedProperties: false61 62examples:63 - |64 i2c {65 #address-cells = <1>;66 #size-cells = <0>;67 68 tpm@57 {69 label = "tpm";70 compatible = "nuvoton,npct601";71 reg = <0x57>;72 linux,sml-base = <0x7f 0xfd450000>;73 linux,sml-size = <0x10000>;74 };75 };76 77 - |78 #include <dt-bindings/gpio/gpio.h>79 #include <dt-bindings/interrupt-controller/irq.h>80 i2c {81 #address-cells = <1>;82 #size-cells = <0>;83 84 tpm@13 {85 reg = <0x13>;86 compatible = "st,st33zp24-i2c";87 interrupt-parent = <&gpio5>;88 interrupts = <7 IRQ_TYPE_LEVEL_HIGH>;89 lpcpd-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;90 };91 };92