linux-kernel - Re: [PATCH v5 01/11] dt-bindings: arm: fsl: add imx-se-fw binding doc

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Message-ID: <574e93da-ec74-f1a2-7170-c16bb225a2bb@kernel.org>
Date:   Thu, 24 Aug 2023 20:45:41 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Rob Herring <robh@...nel.org>, Pankaj Gupta <pankaj.gupta@....com>
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        clin@...e.com, conor+dt@...nel.org, pierre.gondois@....com,
        ping.bai@....com, xiaoning.wang@....com, wei.fang@....com,
        peng.fan@....com, haibo.chen@....com, festevam@...il.com,
        linux-imx@....com, davem@...emloft.net,
        krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, gaurav.jain@....com,
        alexander.stein@...tq-group.com, sahil.malhotra@....com,
        aisheng.dong@....com, V.Sethi@....com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v5 01/11] dt-bindings: arm: fsl: add imx-se-fw binding doc

On 23/08/2023 14:43, Rob Herring wrote:
>> +                                                          |
>> +  +------------------------------------------------------ |
>> +                     |             |           |          |
>> +  userspace     /dev/ele_muXch0    |           |          |
>> +                           /dev/ele_muXch1     |          |
>> +                                         /dev/ele_muXchY  |
>> +                                                          |
>> +
>> +  When a user sends a command to the firmware, it registers its device_ctx
>> +  as waiter of a response from firmware.
>> +
>> +  A user can be registered as receiver of command from the ELE.
>> +  Create char devices in /dev as channels of the form /dev/ele_muXchY with X
>> +  the id of the driver and Y for each users. It allows to send and receive
>> +  messages to the NXP EdgeLock Enclave IP firmware on NXP SoC, where current
>> +  possible value, i.e., supported SoC(s) are imx8ulp, imx93.
> 
> Looks like a bunch of Linux details which don't belong in the binding.
> 
> Why do you need your own custom interface to userspace? No one else has 
> a similar feature in their platforms? Something like virtio or rpmsg 
> doesn't work?

+Cc Greg,

I doubt they care. This is some stub-driver to pass messages from
user-space to the firmware. The interface is undocumented, without
examples and no user-space user.

Best regards,
Krzysztof