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

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Date:   Tue, 7 Nov 2023 12:09:58 +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 11/6/23 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/

> 
>>   1 file changed, 26 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/soc/amd/amd.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/soc/amd/amd.yaml b/Documentation/devicetree/bindings/soc/amd/amd.yaml
>> new file mode 100644
>> index 000000000000..21adf28756fa
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/soc/amd/amd.yaml
>> @@ -0,0 +1,26 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/soc/amd/amd.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: AMD Platforms
>> +
>> +maintainers:
>> +  - Michal Simek <michal.simek@....com>
>> +
>> +description: |
>> +  AMD boards with MicroBlaze V SOC
>> +
>> +properties:
>> +  $nodename:
>> +    const: '/'
>> +  compatible:
>> +    oneOf:
>> +      - description: AMD MicroBlaze V
>> +        items:
>> +          - const: amd,mbv
> 
> You don't actually list any boards here, but instead permit having only
> the SoC compatible and no board one. The SoC compatible is also
> incredibly generic. Personally I don't think this binding makes any
> sense as it appears to exist as a catch all for anything using your
> new cores in any combination.

I think I need to define any string for compatibility because it is standard 
property. Because this is soft core it can be added to any board with AMD/Xilinx 
chip. I don't have really an option to list all boards.

I am happy to change it to something else but not sure to what.

Thanks,
Michal