linux-kernel - Re: [PATCH v3 1/4] dt-bindings: net: Add FSD EQoS device tree bindings

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Message-ID: <4e745c2a-57bd-45da-8bd2-ee1cb2bab84f@lunn.ch>
Date:   Mon, 14 Aug 2023 22:39:55 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Sriranjani P <sriranjani.p@...sung.com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        richardcochran@...il.com, alexandre.torgue@...s.st.com,
        joabreu@...opsys.com, mcoquelin.stm32@...il.com,
        alim.akhtar@...sung.com, linux-fsd@...la.com,
        pankaj.dubey@...sung.com, swathi.ks@...sung.com,
        ravi.patel@...sung.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 1/4] dt-bindings: net: Add FSD EQoS device tree
 bindings

> +  fsd-rx-clock-skew:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    items:
> +      - items:
> +          - description: phandle to the syscon node
> +          - description: offset of the control register
> +    description:
> +      Should be phandle/offset pair. The phandle to the syscon node.

What clock are you skew-ing here? And why?

> +    ethernet_1: ethernet@...00000 {
> +              compatible = "tesla,dwc-qos-ethernet-4.21";
> +              reg = <0x0 0x14300000 0x0 0x10000>;
> +              interrupts = <GIC_SPI 176 IRQ_TYPE_LEVEL_HIGH>;
> +              clocks = <&clock_peric PERIC_EQOS_TOP_IPCLKPORT_CLK_PTP_REF_I>,
> +                       <&clock_peric PERIC_EQOS_TOP_IPCLKPORT_ACLK_I>,
> +                       <&clock_peric PERIC_EQOS_TOP_IPCLKPORT_HCLK_I>,
> +                       <&clock_peric PERIC_EQOS_TOP_IPCLKPORT_RGMII_CLK_I>,
> +                       <&clock_peric PERIC_EQOS_TOP_IPCLKPORT_CLK_RX_I>,
> +                       <&clock_peric PERIC_BUS_D_PERIC_IPCLKPORT_EQOSCLK>,
> +                       <&clock_peric PERIC_BUS_P_PERIC_IPCLKPORT_EQOSCLK>,
> +                       <&clock_peric PERIC_EQOS_PHYRXCLK_MUX>,
> +                       <&clock_peric PERIC_EQOS_PHYRXCLK>,
> +                       <&clock_peric PERIC_DOUT_RGMII_CLK>;
> +              clock-names = "ptp_ref",
> +                            "master_bus",
> +                            "slave_bus",
> +                            "tx",
> +                            "rx",
> +                            "master2_bus",
> +                            "slave2_bus",
> +                            "eqos_rxclk_mux",
> +                            "eqos_phyrxclk",
> +                            "dout_peric_rgmii_clk";
> +              pinctrl-names = "default";
> +              pinctrl-0 = <&eth1_tx_clk>, <&eth1_tx_data>, <&eth1_tx_ctrl>,
> +                          <&eth1_phy_intr>, <&eth1_rx_clk>, <&eth1_rx_data>,
> +                          <&eth1_rx_ctrl>, <&eth1_mdio>;
> +              fsd-rx-clock-skew = <&sysreg_peric 0x10>;
> +              iommus = <&smmu_peric 0x0 0x1>;
> +              phy-mode = "rgmii";

I know it is just an example, but "rgmii" is generally
wrong. "rgmii-id" is generally what you need. And when i do see
"rgmii", it starts ringing alarm bells for me, it could mean your
RGMII delays are being handled wrongly.

       Andrew