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23595de568
Commit 4f2a348aa3 ("arm64: dts: imx8mm-venice-gw73xx: add TPM device")
added a devicetree node for the Trusted Platform Module on certain
Gateworks boards.
The commit only used the generic "tcg,tpm_tis-spi" compatible string,
but public documentation shows that the chip is an ATTPM20P from Atmel
(nowadays Microchip):
https://trac.gateworks.com/wiki/tpm
Add the chip to the supported compatible strings of the TPM TIS SPI
schema.
For reference, a datasheet is available at:
https://ww1.microchip.com/downloads/en/DeviceDoc/ATTPM20P-Trusted-Platform-Module-TPM-2.0-SPI-Interface-Summary-Data-Sheet-DS40002082A.pdf
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Cc: Tim Harvey <tharvey@gateworks.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
77 lines
1.9 KiB
YAML
77 lines
1.9 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/tpm/tcg,tpm_tis-spi.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: SPI-attached Trusted Platform Module conforming to TCG TIS specification
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maintainers:
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- Lukas Wunner <lukas@wunner.de>
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description: |
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The Trusted Computing Group (TCG) has defined a multi-vendor standard
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for accessing a TPM chip. It can be transported over various buses,
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one of them being SPI. The standard is named:
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TCG PC Client Specific TPM Interface Specification (TIS)
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https://trustedcomputinggroup.org/resource/pc-client-work-group-pc-client-specific-tpm-interface-specification-tis/
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properties:
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compatible:
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items:
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- enum:
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- atmel,attpm20p
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- infineon,slb9670
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- st,st33htpm-spi
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- st,st33zp24-spi
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- const: tcg,tpm_tis-spi
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allOf:
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- $ref: tpm-common.yaml#
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- $ref: /schemas/spi/spi-peripheral-props.yaml#
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- if:
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properties:
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compatible:
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contains:
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const: st,st33zp24-spi
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then:
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properties:
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spi-max-frequency:
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maximum: 10000000
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required:
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- compatible
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- reg
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unevaluatedProperties: false
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examples:
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- |
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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tpm@0 {
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reg = <0>;
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compatible = "infineon,slb9670", "tcg,tpm_tis-spi";
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spi-max-frequency = <10000000>;
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};
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};
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- |
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#include <dt-bindings/gpio/gpio.h>
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#include <dt-bindings/interrupt-controller/irq.h>
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spi {
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#address-cells = <1>;
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#size-cells = <0>;
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tpm@0 {
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reg = <0>;
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compatible = "st,st33zp24-spi", "tcg,tpm_tis-spi";
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spi-max-frequency = <10000000>;
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interrupt-parent = <&gpio5>;
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interrupts = <7 IRQ_TYPE_LEVEL_HIGH>;
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lpcpd-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
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};
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};
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