linux-kernel - Re: [PATCH V4 1/2] dt-bindings: mailbox: Document qcom,ipq5424-tmel

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Message-ID: <ru37oebencfqbepop6ka5i2fc64ifk4nnwqmb4o52nwccpplkp@b7xxxpp5snip>
Date: Fri, 28 Mar 2025 14:51:49 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Sricharan R <quic_srichara@...cinc.com>
Cc: jassisinghbrar@...il.com, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        andersson@...nel.org, konradybcio@...nel.org,
        manivannan.sadhasivam@...aro.org, dmitry.baryshkov@...aro.org
Subject: Re: [PATCH V4 1/2] dt-bindings: mailbox: Document qcom,ipq5424-tmel

On Thu, Mar 27, 2025 at 11:47:49PM +0530, Sricharan R wrote:
> From: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> 
> TMEL(Trust Management Engine Lite) subsystem provides different kinds of

Trust whatever SubSystem (TMEL SS) ...

different to what?

> services like secureboot, remote image authentication, key management,
> crypto, OEM provisioning etc.
> 
> The QMP mailbox is the primary means of communication between TMEL SS and

What is QMP?

> other subsystem on the SoC. A dedicated pair of inbound and outbound
> mailboxes is implemented for each subsystem/external execution environment

Is it implemented in the driver? Is it provided by the hardware? By the
firmware?

> which needs to communicate with TMEL for security services. The inbound
> mailboxes are used to send IPC requests to TMEL, which are then processed
> by TMEL firmware and accordingly the responses are sent back via outbound
> mailboxes.

-- 
With best wishes
Dmitry