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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-spi.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: SPI-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 SPI. 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/
properties:
compatible:
items:
- enum:
- infineon,slb9670
- st,st33htpm-spi
- st,st33zp24-spi
- const: tcg,tpm_tis-spi
allOf:
- $ref: tpm-common.yaml#
- $ref: /schemas/spi/spi-peripheral-props.yaml#
- if:
properties:
compatible:
contains:
const: st,st33zp24-spi
then:
properties:
spi-max-frequency:
maximum: 10000000
required:
- compatible
- reg
unevaluatedProperties: false
examples:
- |
spi {
#address-cells = <1>;
#size-cells = <0>;
tpm@0 {
reg = <0>;
compatible = "infineon,slb9670", "tcg,tpm_tis-spi";
spi-max-frequency = <10000000>;
};
};
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
spi {
#address-cells = <1>;
#size-cells = <0>;
tpm@0 {
reg = <0>;
compatible = "st,st33zp24-spi", "tcg,tpm_tis-spi";
spi-max-frequency = <10000000>;
interrupt-parent = <&gpio5>;
interrupts = <7 IRQ_TYPE_LEVEL_HIGH>;
lpcpd-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
};
};
|
