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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/tpm/tcg,tpm-tis-i2c.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: I²C-attached Trusted Platform Module conforming to TCG TIS specification
maintainers:
- Lukas Wunner <lukas@wunner.de>
description: |
The Trusted Computing Group (TCG) has defined a multi-vendor standard
for accessing a TPM chip. It can be transported over various buses,
one of them being I²C. The standard is named:
TCG PC Client Specific TPM Interface Specification (TIS)
https://trustedcomputinggroup.org/resource/pc-client-work-group-pc-client-specific-tpm-interface-specification-tis/
The I²C interface was not originally part of the standard, but added
in 2017 with a separate document:
TCG PC Client Platform TPM Profile Specification for TPM 2.0 (PTP)
https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
Recent TPM 2.0 chips conform to this generic interface, others use a
vendor-specific I²C interface.
properties:
compatible:
oneOf:
- description: Generic TPM 2.0 chips conforming to TCG PTP interface
items:
- enum:
- infineon,slb9673
- nuvoton,npct75x
- const: tcg,tpm-tis-i2c
- description: TPM 1.2 and 2.0 chips with vendor-specific I²C interface
items:
- enum:
- atmel,at97sc3204t # TPM 1.2
- infineon,slb9635tt # TPM 1.2 (maximum 100 kHz)
- infineon,slb9645tt # TPM 1.2 (maximum 400 kHz)
- infineon,tpm_i2c_infineon # TPM 1.2
- nuvoton,npct501 # TPM 1.2
- nuvoton,npct601 # TPM 2.0
- st,st33zp24-i2c # TPM 2.0
- winbond,wpct301 # TPM 1.2
reg:
description: address of TPM on the I²C bus
allOf:
- $ref: tpm-common.yaml#
required:
- compatible
- reg
unevaluatedProperties: false
examples:
- |
i2c {
#address-cells = <1>;
#size-cells = <0>;
tpm@57 {
label = "tpm";
compatible = "nuvoton,npct601";
reg = <0x57>;
linux,sml-base = <0x7f 0xfd450000>;
linux,sml-size = <0x10000>;
};
};
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
i2c {
#address-cells = <1>;
#size-cells = <0>;
tpm@13 {
reg = <0x13>;
compatible = "st,st33zp24-i2c";
interrupt-parent = <&gpio5>;
interrupts = <7 IRQ_TYPE_LEVEL_HIGH>;
lpcpd-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
};
};
|
