linux-kernel - Re: [PATCH v5 1/5] tpm_crb: implement driver compliant to CRB over FF-A

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Message-ID: <41d5f912-9288-4e13-b074-bd64aacc7a5e@arm.com>
Date: Thu, 20 Feb 2025 13:02:49 -0600
From: Stuart Yoder <stuart.yoder@....com>
To: Jarkko Sakkinen <jarkko@...nel.org>
Cc: linux-integrity@...r.kernel.org, peterhuewe@....de, jgg@...pe.ca,
 sudeep.holla@....com, rafael@...nel.org, lenb@...nel.org,
 linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 1/5] tpm_crb: implement driver compliant to CRB over
 FF-A


On 2/20/25 3:28 AM, Jarkko Sakkinen wrote:
> On Wed, Feb 19, 2025 at 02:10:10PM -0600, Stuart Yoder wrote:
>> The Arm specification TPM Service CRB over FF-A specification
>> defines the FF-A messages to interact with a CRB-based TPM
>> implemented as an FF-A secure partition.
>>
>> Spec URL:
>> https://developer.arm.com/documentation/den0138/latest/
>>
>> This driver is probed when a TPM Secure Partition is
>> discovered by the FF-A subsystem. It exposes APIs
>> used by the TPM CRB driver to send notifications to
>> the TPM.
>>
>> Acked-by: Sudeep Holla <sudeep.holla@....com>
>> Signed-off-by: Stuart Yoder <stuart.yoder@....com>
> 
> Cutting hairs now but as I cannot test this and this is 1/5:
> can this patch be run without 2/5-4/5?

Yes. This 1/5 patch has no compile time or runtime dependency
on 2/5-4/5.

Thanks,
Stuart