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           - infineon,slb9670
  24           - st,st33htpm-spi
  25           - st,st33zp24-spi
  26       - const: tcg,tpm_tis-spi
  27
  28 allOf:
  29   - $ref: tpm-common.yaml#
  30   - $ref: /schemas/spi/spi-peripheral-props.yaml#
  31   - if:
  32       properties:
  33         compatible:
  34           contains:
  35             const: st,st33zp24-spi
  36     then:
  37       properties:
  38         spi-max-frequency:
  39           maximum: 10000000
  40
  41 required:
  42   - compatible
  43   - reg
  44
  45 unevaluatedProperties: false
  46
  47 examples:
  48   - |
  49     spi {
  50         #address-cells = <1>;
  51         #size-cells = <0>;
  52
  53         tpm@0 {
  54             reg = <0>;
  55             compatible = "infineon,slb9670", "tcg,tpm_tis-spi";
  56             spi-max-frequency = <10000000>;
  57         };
  58     };
  59
  60   - |
  61     #include <dt-bindings/gpio/gpio.h>
  62     #include <dt-bindings/interrupt-controller/irq.h>
  63     spi {
  64         #address-cells = <1>;
  65         #size-cells = <0>;
  66
  67         tpm@0 {
  68             reg = <0>;
  69             compatible = "st,st33zp24-spi", "tcg,tpm_tis-spi";
  70             spi-max-frequency = <10000000>;
  71             interrupt-parent = <&gpio5>;
  72             interrupts = <7 IRQ_TYPE_LEVEL_HIGH>;
  73             lpcpd-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
  74         };
  75     };