linux-kernel - Re: [PATCH 2/2] tee: optee: allow selection of ti-smc as a calling method

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Message-ID: <CAL_JsqKSt9H6aSf0x8WYMmWjEWb3mZHJOdBfepaX9QJ6GNg+Yw@mail.gmail.com>
Date:   Tue, 19 Sep 2017 16:10:25 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     "Andrew F. Davis" <afd@...com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] tee: optee: allow selection of ti-smc as a calling method

On Tue, Sep 19, 2017 at 10:54 AM, Andrew F. Davis <afd@...com> wrote:
> On 09/19/2017 08:36 AM, Rob Herring wrote:
>> On Mon, Sep 18, 2017 at 3:50 PM, Andrew F. Davis <afd@...com> wrote:
>>> On TI platforms OP-TEE must be called using a modified SMC call,
>>> allow the selection of this though DT.
>>>
>>> Signed-off-by: Andrew F. Davis <afd@...com>
>>> ---
>>>  Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt | 2 ++
>>>  drivers/tee/optee/core.c                                           | 2 ++
>>>  2 files changed, 4 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt
>>> index d38834c67dff..a3275ecdf186 100644
>>> --- a/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt
>>> +++ b/Documentation/devicetree/bindings/arm/firmware/linaro,optee-tz.txt
>>> @@ -20,6 +20,8 @@ the reference implementation maintained by Linaro.
>>>                     "hvc" : HVC #0, with the register assignments specified
>>>                            in drivers/tee/optee/optee_smc.h
>>>
>>> +                   "ti-smc" : Similar to "smc" with TI specific register
>>> +                             adjustments
>>
>> Sigh, really? IMO, this should be determined from the compatible
>> string. Then the next TI (or any vendor) specific thing can be handled
>> without a DT change.
>>
>
> Which compatible string, do you mean the OP-TEE driver check the top
> level platform compatible string?

No, you need to have something like "ti,optee-tz" for the driver to
match on because your implementation is different.

Rob