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

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Message-ID: <AM9PR04MB8211D170F1D484E083C8F899E8E0A@AM9PR04MB8211.eurprd04.prod.outlook.com>
Date:   Mon, 28 Aug 2023 06:00:17 +0000
From:   Varun Sethi <V.Sethi@....com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzk@...nel.org>
CC:     Rob Herring <robh@...nel.org>, Pankaj Gupta <pankaj.gupta@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "clin@...e.com" <clin@...e.com>,
        "conor+dt@...nel.org" <conor+dt@...nel.org>,
        "pierre.gondois@....com" <pierre.gondois@....com>,
        Jacky Bai <ping.bai@....com>,
        Clark Wang <xiaoning.wang@....com>,
        Wei Fang <wei.fang@....com>, Peng Fan <peng.fan@....com>,
        Bough Chen <haibo.chen@....com>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Gaurav Jain <gaurav.jain@....com>,
        "alexander.stein@...tq-group.com" <alexander.stein@...tq-group.com>,
        Sahil Malhotra <sahil.malhotra@....com>,
        Aisheng Dong <aisheng.dong@....com>
Subject: RE: [EXT] Re: [PATCH v5 01/11] dt-bindings: arm: fsl: add imx-se-fw
 binding doc

Hi Greg,

> -----Original Message-----
> From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Sent: Friday, August 25, 2023 12:54 AM
> To: Krzysztof Kozlowski <krzk@...nel.org>
> Cc: Rob Herring <robh@...nel.org>; Pankaj Gupta
> <pankaj.gupta@....com>; shawnguo@...nel.org; s.hauer@...gutronix.de;
> kernel@...gutronix.de; clin@...e.com; conor+dt@...nel.org;
> pierre.gondois@....com; Jacky Bai <ping.bai@....com>; Clark Wang
> <xiaoning.wang@....com>; Wei Fang <wei.fang@....com>; Peng Fan
> <peng.fan@....com>; Bough Chen <haibo.chen@....com>;
> festevam@...il.com; dl-linux-imx <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 <gaurav.jain@....com>;
> alexander.stein@...tq-group.com; Sahil Malhotra
> <sahil.malhotra@....com>; Aisheng Dong <aisheng.dong@....com>; Varun
> Sethi <V.Sethi@....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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