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

[Varun Sethi]

Hi Greg,

> -----Original Message-----
> From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Sent: Friday, August 25, 2023 12:54 AM
> To: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
> Cc: Rob Herring <robh@xxxxxxxxxx>; Pankaj Gupta
> <pankaj.gupta@xxxxxxx>; shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx;
> kernel@xxxxxxxxxxxxxx; clin@xxxxxxxx; conor+dt@xxxxxxxxxx;
> pierre.gondois@xxxxxxx; Jacky Bai <ping.bai@xxxxxxx>; Clark Wang
> <xiaoning.wang@xxxxxxx>; Wei Fang <wei.fang@xxxxxxx>; Peng Fan
> <peng.fan@xxxxxxx>; Bough Chen <haibo.chen@xxxxxxx>;
> festevam@xxxxxxxxx; dl-linux-imx <linux-imx@xxxxxxx>;
> davem@xxxxxxxxxxxxx; krzysztof.kozlowski+dt@xxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; Gaurav Jain <gaurav.jain@xxxxxxx>;
> alexander.stein@xxxxxxxxxxxxxxx; Sahil Malhotra
> <sahil.malhotra@xxxxxxx>; Aisheng Dong <aisheng.dong@xxxxxxx>; Varun
> Sethi <V.Sethi@xxxxxxx>
> Subject: [EXT] Re: [PATCH v5 01/11] dt-bindings: arm: fsl: add imx-se-fw
> binding doc
> 
> Caution: This is an external email. Please take care when clicking links
or
> opening attachments. When in doubt, report the message using the 'Report
> this email' button
> 
> 
> On Thu, Aug 24, 2023 at 08:45:41PM +0200, Krzysztof Kozlowski wrote:
> > 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.
> 
> Great, no user?  Let's delete the code then :)
> 
[Varun] We do have middleware applications that utilize the driver.
Following
are the links:
https://github.com/nxp-imx/imx-secure-enclave
https://github.com/nxp-imx/imx-smw

Also, we plan to enable the kernel crypto API interface to 
leverage operations provided by the firmware.

Regards
Varun

Attachment: smime.p7s
Description: S/MIME cryptographic signature