linux-kernel - Re: [Tee-dev] [PATCHv3 2/3] optee: use uuid for sysfs driver entry

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Message-ID: <CAFA6WYN7d=wEY_4wRmG4p5dBHHL1+0u8i5=uf6xZgv1UJsSgEA@mail.gmail.com>
Date:   Tue, 26 May 2020 16:07:34 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     Jerome Forissier <jerome@...issier.org>
Cc:     Maxim Uvarov <maxim.uvarov@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        "tee-dev @ lists . linaro . org" <tee-dev@...ts.linaro.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        linux-integrity@...r.kernel.org, Arnd Bergmann <arnd@...aro.org>,
        peterhuewe@....de
Subject: Re: [Tee-dev] [PATCHv3 2/3] optee: use uuid for sysfs driver entry

On Mon, 25 May 2020 at 21:24, Jerome Forissier <jerome@...issier.org> wrote:
>
>
>
> On 5/25/20 3:36 PM, Maxim Uvarov wrote:
> > On Mon, 25 May 2020 at 15:10, Jerome Forissier <jerome@...issier.org> wrote:
> >>
> >>
> >>
> >> On 5/25/20 1:52 PM, Maxim Uvarov wrote:
> >>> Optee device names for sysfs needed to be unique
> >>
> >> s/Optee/OP-TEE/
> >> s/needed/need/
> >>
> >>> and it's better if they will mean something. UUID for name
> >>> looks like good solution:
> >>> /sys/bus/tee/devices/optee-clnt-<uuid>
> >>
> >> How about mentioning it is the UUID of the Trusted Application on the
> >> TEE side?
> >>
> >
> > Jerome, do you think optee-ta-<uuid> is more suitable here?
>
> Yes, a bit better I think. More "self explanatory"... kind of :)
>

+1

> Is it possible to have several devices bound to the same TA? I think
> nothing forbids this although we may not have any use case for now...
>

A single TA is represented via a single device represented via UUID on
the TEE bus. And I can't think of a scenario where the user may not
want to split the TA so as to support a particular driver in Linux.

-Sumit

> --
> Jerome
> _______________________________________________
> Tee-dev mailing list
> Tee-dev@...ts.linaro.org
> https://lists.linaro.org/mailman/listinfo/tee-dev

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