linux-kernel - Re: [PATCH v3 3/4] dt-bindings: firmware: Add Qualcomm QSEECOM interface

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Date:   Wed, 8 Mar 2023 16:16:57 -0600
From:   Rob Herring <robh@...nel.org>
To:     Maximilian Luz <luzmaximilian@...il.com>
Cc:     Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Johan Hovold <johan@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Ilias Apalodimas <ilias.apalodimas@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Sumit Garg <sumit.garg@...aro.org>,
        Steev Klimaszewski <steev@...i.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v3 3/4] dt-bindings: firmware: Add Qualcomm QSEECOM
 interface

On Sun, Mar 05, 2023 at 03:21:18AM +0100, Maximilian Luz wrote:
> Add bindings for the Qualcomm Secure Execution Environment interface
> (QSEECOM).

Pretty sure I already asked, but no answer in the commit message. Why do 
we need this? You've already declared the platform supports SCM calls 
with "qcom,scm". Why can't you probe whether you have QSEECOM or not? DT 
is for non-discoverable h/w we are stuck with. Why is software made 
non-discoverable too?

Nodes with only a compatible string are usually just an abuse of DT to 
instantiate some driver.

Rob