Re: [PATCH 3/7] dt-bindings: tpm: Add previously undocumented properties

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On Fri, Sep 30, 2022 at 12:02 PM Alexander Steffen
<Alexander.Steffen@xxxxxxxxxxxx> wrote:
>
> TPM devices may use some more properties than previously allowed by
> trivial-devices.yaml. Document those in trivial-tpms.yaml.
>
> Signed-off-by: Alexander Steffen <Alexander.Steffen@xxxxxxxxxxxx>
> ---
>  .../bindings/security/tpm/trivial-tpms.yaml      | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)

Adding these here means we would need to duplicate them for any device
with its own schema file. You need a common TPM property schema which
the specific TPM device schemas can reference.

>
> diff --git a/Documentation/devicetree/bindings/security/tpm/trivial-tpms.yaml b/Documentation/devicetree/bindings/security/tpm/trivial-tpms.yaml
> index 2092341c6491..a9e2dd17b1ca 100644
> --- a/Documentation/devicetree/bindings/security/tpm/trivial-tpms.yaml
> +++ b/Documentation/devicetree/bindings/security/tpm/trivial-tpms.yaml
> @@ -25,6 +25,22 @@ properties:
>
>    spi-max-frequency: true
>
> +  linux,sml-base:
> +    $ref: /schemas/types.yaml#/definitions/uint64
> +    description: |
> +      64-bit base address of the reserved memory allocated for the firmware
> +      event log
> +
> +  linux,sml-size:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: size of the memory allocated for the firmware event log
> +
> +  powered-while-suspended:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description: |
> +      Present when the TPM is left powered on between suspend and resume
> +      (makes the suspend/resume callbacks do nothing).
> +
>    compatible:
>      contains:
>        enum:
> --
> 2.25.1
>



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