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
7 title: SPI-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 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
19 properties:
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
29 allOf:
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
42 required:
43 - compatible
44 - reg
45
46 unevaluatedProperties: false
47
48 examples:
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 };
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