netdev - Re: [PATCH net-next v5 1/5] net: dt-bindings: Introduce the Qualcomm IPQESS Ethernet controller

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Date:   Fri, 21 Oct 2022 14:30:59 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Maxime Chevallier <maxime.chevallier@...tlin.com>
CC:     "davem@...emloft.net" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "thomas.petazzoni@...tlin.com" <thomas.petazzoni@...tlin.com>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>
Subject: Re: [PATCH net-next v5 1/5] net: dt-bindings: Introduce the Qualcomm
 IPQESS Ethernet controller

On Fri, Oct 21, 2022 at 02:45:52PM +0200, Maxime Chevallier wrote:
> +  interrupts:
> +    minItems: 2
> +    maxItems: 32
> +    description: One interrupt per tx and rx queue, with up to 16 queues.

What does the binding require in terms of ordering, exactly? Whose
interrupt is the 7th one (GIC_SPI 71 in your example)? RX/TX of which
queue?

> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clocks
> +  - resets
> +  - phy-mode
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/qcom,gcc-ipq4019.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    gmac: ethernet@...0000 {
> +        compatible = "qcom,ipq4019-ess-edma";
> +        reg = <0xc080000 0x8000>;
> +        resets = <&gcc ESS_RESET>;
> +        clocks = <&gcc GCC_ESS_CLK>;
> +        interrupts = <GIC_SPI  65 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  66 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  67 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  68 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  69 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  70 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  71 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  72 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  73 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  74 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  75 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  76 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  77 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  78 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  79 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI  80 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 240 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 241 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 242 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 243 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 244 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 245 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 246 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 247 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 248 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 249 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 250 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 251 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 252 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 253 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 254 IRQ_TYPE_EDGE_RISING>,
> +                     <GIC_SPI 255 IRQ_TYPE_EDGE_RISING>;
> +
> +        phy-mode = "internal";

I think empty lines are typically added between properties and nodes
(and between nodes on the same hierarchy), rather than between 2
properties.

> +        fixed-link {
> +            speed = <1000>;
> +            full-duplex;
> +            pause;
> +            asym-pause;

Any particular reason for "asym-pause"? Looking at the comment above
linkmode_resolve_pause(), I don't think it makes any difference to the
flow control resolution (link partner AsmDir is "don't care" when we
have MAC_SYM_PAUSE in mac_capabilities and the "fixed-link" node -
effectively the link partner - also has "pause").

> +        };
> +    };
> +
> +...
> -- 
> 2.37.3
>