[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 at linuxfoundation.org>
> Sent: Friday, August 25, 2023 12:54 AM
> To: Krzysztof Kozlowski <krzk at kernel.org>
> Cc: Rob Herring <robh at kernel.org>; Pankaj Gupta
> <pankaj.gupta at nxp.com>; shawnguo at kernel.org; s.hauer at pengutronix.de;
> kernel at pengutronix.de; clin at suse.com; conor+dt at kernel.org;
> pierre.gondois at arm.com; Jacky Bai <ping.bai at nxp.com>; Clark Wang
> <xiaoning.wang at nxp.com>; Wei Fang <wei.fang at nxp.com>; Peng Fan
> <peng.fan at nxp.com>; Bough Chen <haibo.chen at nxp.com>;
> festevam at gmail.com; dl-linux-imx <linux-imx at nxp.com>;
> davem at davemloft.net; krzysztof.kozlowski+dt at linaro.org; linux-arm-
> kernel at lists.infradead.org; devicetree at vger.kernel.org; linux-
> kernel at vger.kernel.org; Gaurav Jain <gaurav.jain at nxp.com>;
> alexander.stein at ew.tq-group.com; Sahil Malhotra
> <sahil.malhotra at nxp.com>; Aisheng Dong <aisheng.dong at nxp.com>; Varun
> Sethi <V.Sethi at nxp.com>
> Subject: [EXT] Re: [PATCH v5 01/11] dt-bindings: arm: fsl: add imx-se-fw
> binding doc
> 
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> 
> 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
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