netdev - Re: [PATCH v3 2/9] dt-bindings: net: starfive,jh7110-dwmac: Add JH7100 SoC compatible

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Message-ID: <6c62e3b2-acde-4580-9b67-56683289e45e@collabora.com>
Date: Fri, 15 Dec 2023 23:03:24 +0200
From: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To: Samuel Holland <samuel.holland@...ive.com>,
 Jessica Clarke <jrtc27@...c27.com>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Emil Renner Berthing <kernel@...il.dk>,
 Samin Guo <samin.guo@...rfivetech.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Hal Feng <hal.feng@...rfivetech.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Richard Cochran <richardcochran@...il.com>,
 Giuseppe Cavallaro <peppe.cavallaro@...com>, netdev@...r.kernel.org,
 "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
 <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
 linux-riscv <linux-riscv@...ts.infradead.org>, linux-clk@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH v3 2/9] dt-bindings: net: starfive,jh7110-dwmac: Add
 JH7100 SoC compatible

On 12/15/23 22:59, Samuel Holland wrote:
> On 2023-12-15 2:47 PM, Jessica Clarke wrote:
>> On 15 Dec 2023, at 20:40, Cristian Ciocaltea <cristian.ciocaltea@...labora.com> wrote:
>>>
>>> The Synopsys DesignWare MAC found on StarFive JH7100 SoC is mostly
>>> similar to the newer JH7110, but it requires only two interrupts and a
>>> single reset line, which is 'ahb' instead of the commonly used
>>> 'stmmaceth'.
>>>
>>> Since the common binding 'snps,dwmac' allows selecting 'ahb' only in
>>> conjunction with 'stmmaceth', extend the logic to also permit exclusive
>>> usage of the 'ahb' reset name.  This ensures the following use cases are
>>> supported:
>>>
>>>  JH7110: reset-names = "stmmaceth", "ahb";
>>>  JH7100: reset-names = "ahb";
>>>  other:  reset-names = "stmmaceth";
>>>
>>> Also note the need to use a different dwmac fallback, as v5.20 applies
>>> to JH7110 only, while JH7100 relies on v3.7x.
>>>
>>> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
>>> ---
>>> .../devicetree/bindings/net/snps,dwmac.yaml   |  3 +-
>>> .../bindings/net/starfive,jh7110-dwmac.yaml   | 74 +++++++++++++------
>>> 2 files changed, 55 insertions(+), 22 deletions(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>>> index 5c2769dc689a..c1380ff1c054 100644
>>> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>>> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
>>> @@ -95,6 +95,7 @@ properties:
>>>         - snps,dwmac-5.20
>>>         - snps,dwxgmac
>>>         - snps,dwxgmac-2.10
>>> +        - starfive,jh7100-dwmac
>>>         - starfive,jh7110-dwmac
>>>
>>>   reg:
>>> @@ -146,7 +147,7 @@ properties:
>>>   reset-names:
>>>     minItems: 1
>>>     items:
>>> -      - const: stmmaceth
>>> +      - enum: [stmmaceth, ahb]
>>>       - const: ahb
>>
>> I’m not so well-versed in the YAML bindings, but would this not allow
>> reset-names = "ahb", "ahb"?
> 
> Yes, it would. You need something like:
> 
> reset-names:
>   oneOf:
>     - enum: [stmmaceth, ahb]
>     - items:
>         - const: stmmaceth
>         - const: ahb

Oh yes, I always forget about the "oneOf" thing. Thanks!

> Regards,
> Samuel
>