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

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Date: Fri, 15 Dec 2023 20:47:58 +0000
From: Jessica Clarke <jrtc27@...c27.com>
To: Cristian Ciocaltea <cristian.ciocaltea@...labora.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 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"?

Jess