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 12:38:22 -0600
From: Ninad Palsule <ninad@...ux.ibm.com>
To: Jarkko Sakkinen <jarkko@...nel.org>, 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

Hello Jarkko,

On 12/13/23 12:20, Jarkko Sakkinen wrote:
> 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.

Yes, Sorry. I have cherry-picked this commit from openbmc. Now I have 
removed this line.

Thanks for the review.

Thanks & Regards,

Ninad

>
>> 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