linux-kernel - Re: [PATCH] dt-bindings: soc: Add new board description for MicroBlaze V

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Date:   Wed, 8 Nov 2023 11:24:20 +0100
From:   Michal Simek <michal.simek@....com>
To:     Conor Dooley <conor@...nel.org>
Cc:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com,
        Conor Dooley <conor+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: soc: Add new board description for
 MicroBlaze V



On 11/8/23 11:12, Conor Dooley wrote:
> On Wed, Nov 08, 2023 at 11:06:53AM +0100, Michal Simek wrote:
>>
>>
>> On 11/7/23 22:18, Conor Dooley wrote:
>>> On Tue, Nov 07, 2023 at 12:09:58PM +0100, Michal Simek wrote:
>>>>
>>>>
>>>> On 11/6/23 18:07, Conor Dooley wrote:
>>>>> On Mon, Nov 06, 2023 at 12:53:40PM +0100, Michal Simek wrote:
>>>>>> MicroBlaze V is new AMD/Xilinx soft-core 32bit RISC-V processor IP.
>>>>>> It is hardware compatible with classic MicroBlaze processor. Processor can
>>>>>> be used with standard AMD/Xilinx IPs including interrupt controller and
>>>>>> timer.
>>>>>>
>>>>>> Signed-off-by: Michal Simek <michal.simek@....com>
>>>>>> ---
>>>>>>
>>>>>>     .../devicetree/bindings/soc/amd/amd.yaml      | 26 +++++++++++++++++++
>>>>>
>>>>> Bindings for SoCs (and by extension boards with them) usually go to in
>>>>> $arch/$vendor.yaml not into soc/$vendor/$vendor.yaml. Why is this any
>>>>> different?
>>>>
>>>> I actually found it based on tracking renesas.yaml which describes one of
>>>> risc-v board. No problem to move it under bindings/riscv/
>>>
>>> That one is kinda a special case, as it contains arm/arm64/riscv.
>>
>> If they are kinda a special case then what are we?
>> All AMD/Xilinx platforms(ZynqMP/Versal/Versal NET) can have
>> arm/arm64/riscv/microblaze cpus(riscv/microblaze as soft cores) in the same
>> board (IIRC I have also seen xtensa soft core on our chips too).
> 
> That would be an argument iff you had all of those in a single file, not
> when you only have a single compatible for a riscv "soc" in it.

But DT (compare to System DT) is all the time describing system from cpu point 
of view. Or are they describing all that 3 different cpus via the same DT?

Thanks,
Michal