linux-hardening - Re: [PATCH v1 2/8] dt-bindings: tpm: Add schema for TIS I2C devices

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Date: Wed, 13 Dec 2023 20:20:20 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Ninad Palsule" <ninad@...ux.ibm.com>, <robh+dt@...nel.org>,
 <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
 <joel@....id.au>, <andrew@...econstruct.com.au>, <peterhuewe@....de>,
 <jgg@...pe.ca>, <keescook@...omium.org>, <tony.luck@...el.com>,
 <gpiccoli@...lia.com>, <johannes.holland@...ineon.com>,
 <linux@...ck-us.net>, <broonie@...nel.org>
Cc: <patrick.rudolph@...ements.com>, <vincent@...emblay.dev>,
 <peteryin.openbmc@...il.com>, <lakshmiy@...ibm.com>, <bhelgaas@...gle.com>,
 <naresh.solanki@...ements.com>, <alexander.stein@...tq-group.com>,
 <festevam@...x.de>, <devicetree@...r.kernel.org>,
 <linux-arm-kernel@...ts.infradead.org>, <linux-aspeed@...ts.ozlabs.org>,
 <linux-kernel@...r.kernel.org>, <linux-integrity@...r.kernel.org>,
 <linux-hardening@...r.kernel.org>, <geissonator@...oo.com>
Subject: Re: [PATCH v1 2/8] dt-bindings: tpm: Add schema for TIS I2C devices

On Tue Dec 12, 2023 at 6:39 PM EET, Ninad Palsule wrote:
> From: Johannes Holland <johannes.holland@...ineon.com>
>
> Add a dt schema to support device tree bindings for the generic I2C
> physical layer. Refer to the TCG PC Client Platform TPM Profile (PTP)
> Specification for TPM 2.0 v1.04 Revision 14.
>
> This includes descriptions for the Nuvoton and Infineon devices.
>
> OpenBMC-Staging-Count: 3

Please don't invent your own tags.

> Signed-off-by: Johannes Holland <johannes.holland@...ineon.com>
> Signed-off-by: Joel Stanley <joel@....id.au>
> Signed-off-by: Ninad Palsule <ninad@...ux.ibm.com>
> ---
>  .../bindings/security/tpm/tpm-tis-i2c.yaml    | 50 +++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml
>
> diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml b/Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml
> new file mode 100644
> index 000000000000..de1e34065748
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml
> @@ -0,0 +1,50 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/security/tpm/tpm-tis-i2c.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: I2C PTP based TPM Devices
> +
> +maintainers:
> +  - Johannes Holland <johannes.holland@...ineon.com>
> +
> +description:
> +  Device Tree Bindings for I2C based Trusted Platform Module (TPM).
> +
> +properties:
> +  $nodename:
> +    pattern: "^tpm(@[0-9a-f]+)?$"
> +
> +  compatible:
> +    oneOf:
> +      - description: Infineon's Trusted Platform Module (TPM) (SLB9673).
> +        items:
> +          - const: infineon,slb9673
> +          - const: tcg,tpm-tis-i2c
> +      - description: Nuvoton's Trusted Platform Module (TPM) (NPCT75x).
> +        items:
> +          - const: nuvoton,npct75x
> +          - const: tcg,tpm-tis-i2c
> +      - const: tcg,tpm-tis-i2c
> +  reg:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      tpm@2e {
> +        compatible = "nuvoton,npct75x", "tcg,tpm-tis-i2c";
> +        reg = <0x2e>;
> +      };
> +    };
> +...


BR, Jarkko