linux-kernel - Re: [PATCH 3/3] dt-bindings: riscv: sifive: Add SiFive Private L2 cache controller

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Date:   Fri, 16 Jun 2023 11:37:42 +0100
From:   Ben Dooks <ben.dooks@...ethink.co.uk>
To:     Conor Dooley <conor.dooley@...rochip.com>,
        Eric Lin <eric.lin@...ive.com>
Cc:     conor@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, palmer@...belt.com,
        paul.walmsley@...ive.com, aou@...s.berkeley.edu, maz@...nel.org,
        chenhuacai@...nel.org, baolu.lu@...ux.intel.com, will@...nel.org,
        kan.liang@...ux.intel.com, nnac123@...ux.ibm.com,
        pierre.gondois@....com, huangguangbin2@...wei.com, jgross@...e.com,
        chao.gao@...el.com, maobibo@...ngson.cn,
        linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, dslin1010@...il.com,
        Zong Li <zong.li@...ive.com>, Nick Hu <nick.hu@...ive.com>
Subject: Re: [PATCH 3/3] dt-bindings: riscv: sifive: Add SiFive Private L2
 cache controller

On 16/06/2023 11:10, Conor Dooley wrote:
> Hey Eric,
> 
> On Fri, Jun 16, 2023 at 02:32:10PM +0800, Eric Lin wrote:
>> This add YAML DT binding documentation for SiFive Private L2
>> cache controller
>>
>> Signed-off-by: Eric Lin <eric.lin@...ive.com>
>> Reviewed-by: Zong Li <zong.li@...ive.com>
>> Reviewed-by: Nick Hu <nick.hu@...ive.com>
> 
> Firstly, bindings need to come before the driver using them.
> 
>> ---
>>   .../bindings/riscv/sifive,pL2Cache0.yaml      | 81 +++++++++++++++++++
>>   1 file changed, 81 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/riscv/sifive,pL2Cache0.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/riscv/sifive,pL2Cache0.yaml b/Documentation/devicetree/bindings/riscv/sifive,pL2Cache0.yaml
>> new file mode 100644
>> index 000000000000..b5d8d4a39dde
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/riscv/sifive,pL2Cache0.yaml
> 
> Cache bindings have moved to devicetree/bindings/cache.
> 
>> @@ -0,0 +1,81 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +# Copyright (C) 2023 SiFive, Inc.
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/riscv/sifive,pL2Cache0.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: SiFive Private L2 Cache Controller
>> +
>> +maintainers:
>> +  - Greentime Hu  <greentime.hu@...ive.com>
>> +  - Eric Lin      <eric.lin@...ive.com>
> 
> Drop the alignment here please.
> 
>> +
>> +description:
>> +  The SiFive Private L2 Cache Controller is per hart and communicates with both the upstream
>> +  L1 caches and downstream L3 cache or memory, enabling a high-performance cache subsystem.
>> +  All the properties in ePAPR/DeviceTree specification applies for this platform.
> 
> Please wrap before 80 characters.
> 
>> +
>> +allOf:
>> +  - $ref: /schemas/cache-controller.yaml#
>> +
>> +select:
>> +  properties:
>> +    compatible:
>> +      contains:
>> +        enum:
>> +          - sifive,pL2Cache0
>> +          - sifive,pL2Cache1
> 
> Why is this select: required?
> 
>> +  required:
>> +    - compatible
>> +
>> +properties:
>> +  compatible:
>> +    items:
>> +      - enum:
>> +          - sifive,pL2Cache0
>> +          - sifive,pL2Cache1
> 
> What is the difference between these? (and drop the caps please)
> 
> Should this also not fall back to "cache"?

I thought cache is required as the last resort.
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius

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