linux/Documentation/devicetree/bindings/security/tpm/tpm_tis_spi.txt

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Required properties:
- compatible: should be one of the following
"st,st33htpm-spi"
"infineon,slb9670"
"tcg,tpm_tis-spi"
- spi-max-frequency: Maximum SPI frequency (depends on TPMs).
Optional SoC Specific Properties:
- pinctrl-names: Contains only one value - "default".
- pintctrl-0: Specifies the pin control groups used for this controller.
Example (for ARM-based BeagleBoard xM with TPM_TIS on SPI4):
&mcspi4 {
tpm_tis@0 {
compatible = "tcg,tpm_tis-spi";
spi-max-frequency = <10000000>;
};
};