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

[Krzysztof Kozlowski]

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