xref: /linux/Documentation/devicetree/bindings/tpm/tcg,tpm_tis-spi.yaml (revision 27b984af7a93581e59061e6c4c0c4a62d130d41d) 
1# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/tpm/tcg,tpm_tis-spi.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: SPI-attached Trusted Platform Module conforming to TCG TIS specification
8
9maintainers:
10  - Lukas Wunner <lukas@wunner.de>
11
12description: |
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 SPI.  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
19properties:
20  compatible:
21    items:
22      - enum:
23          - atmel,attpm20p
24          - infineon,slb9670
25          - st,st33htpm-spi
26          - st,st33zp24-spi
27      - const: tcg,tpm_tis-spi
28
29allOf:
30  - $ref: tpm-common.yaml#
31  - $ref: /schemas/spi/spi-peripheral-props.yaml#
32  - if:
33      properties:
34        compatible:
35          contains:
36            const: st,st33zp24-spi
37    then:
38      properties:
39        spi-max-frequency:
40          maximum: 10000000
41
42required:
43  - compatible
44  - reg
45
46unevaluatedProperties: false
47
48examples:
49  - |
50    spi {
51        #address-cells = <1>;
52        #size-cells = <0>;
53
54        tpm@0 {
55            reg = <0>;
56            compatible = "infineon,slb9670", "tcg,tpm_tis-spi";
57            spi-max-frequency = <10000000>;
58        };
59    };
60
61  - |
62    #include <dt-bindings/gpio/gpio.h>
63    #include <dt-bindings/interrupt-controller/irq.h>
64    spi {
65        #address-cells = <1>;
66        #size-cells = <0>;
67
68        tpm@0 {
69            reg = <0>;
70            compatible = "st,st33zp24-spi", "tcg,tpm_tis-spi";
71            spi-max-frequency = <10000000>;
72            interrupt-parent = <&gpio5>;
73            interrupts = <7 IRQ_TYPE_LEVEL_HIGH>;
74            lpcpd-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
75        };
76    };
77