Documentation/devicetree/bindings/tpm/tcg,tpm_tis-spi.yaml

   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     };