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

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Message-ID: <AM9PR04MB9003A7CE12B40492CB23619788819@AM9PR04MB9003.eurprd04.prod.outlook.com>
Date:   Tue, 5 Jul 2022 02:45:10 +0000
From:   Wei Fang <wei.fang@....com>
To:     Ahmad Fatoum <a.fatoum@...gutronix.de>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
CC:     Aisheng Dong <aisheng.dong@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Peng Fan <peng.fan@....com>, Jacky Bai <ping.bai@....com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        "festevam@...il.com" <festevam@...il.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [EXT] Re: [PATCH 2/3] arm64: dts: imx8ulp: Add the fec support

Hi Ahmad:

	Thanks for your reply. clock_ext_rmii and clock_ext_ts indeed belong into board DT, I will move them to imx.8ulp-evk.dts and resubmit the patch. And refer to imx8ulp reference manual, the enet_clk_ref only has external clock source, so it is related to specifical board. Therefore, can I delete the enet_clk_ref clock in imx8ulp.dtsi (as shown below) and override the clock and clock-names properties in imx8ulp-evk.dts ?

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


-----Original Message-----
From: Ahmad Fatoum <a.fatoum@...gutronix.de> 
Sent: 2022年7月4日 15:07
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 <aisheng.dong@....com>; devicetree@...r.kernel.org; Peng Fan <peng.fan@....com>; Jacky Bai <ping.bai@....com>; netdev@...r.kernel.org; linux-kernel@...r.kernel.org; dl-linux-imx <linux-imx@....com>; kernel@...gutronix.de; sudeep.holla@....com; festevam@...il.com; linux-arm-kernel@...ts.infradead.org
Subject: [EXT] Re: [PATCH 2/3] arm64: dts: imx8ulp: Add the fec support

Caution: EXT Email

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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