linux-kernel - RE: [PATCH 13/23] dt-bindings: arm: add Tesla FSD ARM SoC

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Date:   Mon, 17 Jan 2022 18:56:05 +0530
From:   "Alim Akhtar" <alim.akhtar@...sung.com>
To:     "'Krzysztof Kozlowski'" <krzysztof.kozlowski@...onical.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Cc:     <soc@...nel.org>, <linux-clk@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <olof@...om.net>,
        <linus.walleij@...aro.org>, <catalin.marinas@....com>,
        <robh+dt@...nel.org>, <s.nawrocki@...sung.com>,
        <linux-samsung-soc@...r.kernel.org>, <pankaj.dubey@...sung.com>,
        <linux-fsd@...la.com>
Subject: RE: [PATCH 13/23] dt-bindings: arm: add Tesla FSD ARM SoC

Hi Krzysztof

>-----Original Message-----
>From: Krzysztof Kozlowski [mailto:krzysztof.kozlowski@...onical.com]
>Sent: Friday, January 14, 2022 11:00 PM
>To: Alim Akhtar <alim.akhtar@...sung.com>; linux-arm-
>kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
>Cc: soc@...nel.org; linux-clk@...r.kernel.org; devicetree@...r.kernel.org;
>olof@...om.net; linus.walleij@...aro.org; catalin.marinas@....com;
>robh+dt@...nel.org; s.nawrocki@...sung.com; linux-samsung-
>soc@...r.kernel.org; pankaj.dubey@...sung.com; linux-fsd@...la.com
>Subject: Re: [PATCH 13/23] dt-bindings: arm: add Tesla FSD ARM SoC
>
>On 14/01/2022 17:57, Alim Akhtar wrote:
>>
>>
>>> -----Original Message-----
>>> From: Krzysztof Kozlowski [mailto:krzysztof.kozlowski@...onical.com]
>>> Sent: Thursday, January 13, 2022 6:03 PM
>>> To: Alim Akhtar <alim.akhtar@...sung.com>; linux-arm-
>>> kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
>>> Cc: soc@...nel.org; linux-clk@...r.kernel.org;
>>> devicetree@...r.kernel.org; olof@...om.net; linus.walleij@...aro.org;
>>> catalin.marinas@....com;
>>> robh+dt@...nel.org; s.nawrocki@...sung.com; linux-samsung-
>>> soc@...r.kernel.org; pankaj.dubey@...sung.com; linux-fsd@...la.com
>>> Subject: Re: [PATCH 13/23] dt-bindings: arm: add Tesla FSD ARM SoC
>>>
>>> On 13/01/2022 13:11, Alim Akhtar wrote:
>>>> Add device tree bindings for the Tesla FSD ARM SoC.
>>>>
>>>> Cc: linux-fsd@...la.com
>>>> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
>>>> ---
>>>>  .../devicetree/bindings/arm/tesla.yaml        | 25 +++++++++++++++++++
>>>>  1 file changed, 25 insertions(+)
>>>>  create mode 100644
>Documentation/devicetree/bindings/arm/tesla.yaml
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/arm/tesla.yaml
>>>> b/Documentation/devicetree/bindings/arm/tesla.yaml
>>>> new file mode 100644
>>>> index 000000000000..9f89cde76c85
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/arm/tesla.yaml
>>>> @@ -0,0 +1,25 @@
>>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause %YAML 1.2
>>>> +---
>>>> +$id:
>>>> +https://protect2.fireeye.com/v1/url?k=2f0fac44-70949546-2f0e270b-0c
>>>> +c4
>>>> +7a312ab0-50c826f7b1999a5f&q=1&e=bcbf277f-4e93-4705-8f6a-
>>> 2beaa7eb31e2&
>>>>
>+u=http%3A%2F%2Fdevicetree.org%2Fschemas%2Farm%2Ftesla.yaml%23
>>>> +$schema:
>>>> +https://protect2.fireeye.com/v1/url?k=d8493fe2-87d206e0-d848b4ad-
>0c
>>>> +c4
>>>> +7a312ab0-f4e5046adc7da972&q=1&e=bcbf277f-4e93-4705-8f6a-
>>> 2beaa7eb31e2&
>>>> +u=http%3A%2F%2Fdevicetree.org%2Fmeta-schemas%2Fcore.yaml%23
>>>> +
>>>> +title: Tesla Full Self Driving(FSD) platforms device tree bindings
>>>> +
>>>> +maintainers:
>>>> +  - Alim Akhtar <alim.akhtar@...sung.com>
>>>> +  - linux-fsd@...la.com
>>>> +
>>>> +properties:
>>>> +  $nodename:
>>>> +    const: '/'
>>>> +  compatible:
>>>> +    oneOf:
>>>> +
>>>> +      - description: FSD SoC board
>>>> +        items:
>>>> +          - const: tesla,fsd
>>>
>>> Either this is a SoC or a board compatible... Cannot be both.
>>>
>> Actually we call this as fsd board, so let me add accordingly compatible (fsd-
>baord) for board.
>> Thanks
>
>It's confusing and probably not accurate. In your series fsd is three things in
>the same time: an architecture, a SoC and a board (DTS). The last two should
>definitely be different. You probably have some eval board (how it is called
>also in Tesla open source git) or some specific product board.
>
Understood, let me clear this confusion in the patchset-2 where fsd board will have its own compatible and 
of course SoC will have its own (shared with fsd architecture) compatible.

>I cannot judge how different this is from Exynos subarchitecture - looking at
>patches it is not different - so I could understand a FSD sub-arch with only one
>SoC.
>
I understand, it is a bit difficult to visualize it with the current patch set.
As discuss on the other thread, FSD is different, more over the vendor is different, internal design is different.
>
>Best regards,
>Krzysztof