linux-kernel - Re: [PATCH 2/3] arm64: dts: imx8ulp: Add the fec support

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Message-ID: <751e1ec6-2d34-44f6-a6c3-775df8a3cea2@pengutronix.de>
Date:   Mon, 4 Jul 2022 09:07:19 +0200
From:   Ahmad Fatoum <a.fatoum@...gutronix.de>
To:     Wei Fang <wei.fang@....com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        shawnguo@...nel.org, s.hauer@...gutronix.de
Cc:     aisheng.dong@....com, devicetree@...r.kernel.org, peng.fan@....com,
        ping.bai@....com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-imx@....com,
        kernel@...gutronix.de, sudeep.holla@....com, festevam@...il.com,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] arm64: dts: imx8ulp: Add the fec support

Hello Wei,

On 04.07.22 12:10, Wei Fang wrote:
> +	clock_ext_rmii: clock-ext-rmii {
> +		compatible = "fixed-clock";
> +		clock-frequency = <50000000>;
> +		#clock-cells = <0>;
> +		clock-output-names = "ext_rmii_clk";
> +	};
> +
> +	clock_ext_ts: clock-ext-ts {
> +		compatible = "fixed-clock";
> +		#clock-cells = <0>;
> +		clock-output-names = "ext_ts_clk";
> +	};

How are these SoC-specific? They sound like they belong
into board DT.

> +				clocks = <&cgc1 IMX8ULP_CLK_XBAR_DIVBUS>,
> +					 <&pcc4 IMX8ULP_CLK_ENET>,
> +					 <&cgc1 IMX8ULP_CLK_ENET_TS_SEL>,
> +					 <&clock_ext_rmii>;
> +				clock-names = "ipg", "ahb", "ptp", "enet_clk_ref";

I think the default should be the other way round, assume MAC to provide reference
clock and allow override on board-level if PHY does it instead.

Cheers,
Ahmad


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