linux-kernel - Re: [PATCH V2 3/3] arm64: dts: imx8ulp-evk: Add the fec support

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Message-ID: <YsvK99Gb0JL3YbQB@lunn.ch>
Date:   Mon, 11 Jul 2022 09:02:15 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Wei Fang <wei.fang@....com>
Cc:     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, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        peng.fan@....com, ping.bai@....com, sudeep.holla@....com,
        linux-arm-kernel@...ts.infradead.org, aisheng.dong@....com
Subject: Re: [PATCH V2 3/3] arm64: dts: imx8ulp-evk: Add the fec support

On Mon, Jul 11, 2022 at 07:44:34PM +1000, Wei Fang wrote:
> Enable the fec on i.MX8ULP EVK board.
> 
> Signed-off-by: Wei Fang <wei.fang@....com>
> ---
> V2 change:
> Add clock_ext_rmii and clock_ext_ts. They are both related to EVK board.
> ---
>  arch/arm64/boot/dts/freescale/imx8ulp-evk.dts | 57 +++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
> index 33e84c4e9ed8..ebce716b10e6 100644
> --- a/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8ulp-evk.dts
> @@ -19,6 +19,21 @@ memory@...00000 {
>  		device_type = "memory";
>  		reg = <0x0 0x80000000 0 0x80000000>;
>  	};
> +
> +	clock_ext_rmii: clock-ext-rmii {
> +		compatible = "fixed-clock";
> +		clock-frequency = <50000000>;
> +		clock-output-names = "ext_rmii_clk";
> +		#clock-cells = <0>;
> +	};
> +
> +	clock_ext_ts: clock-ext-ts {
> +		compatible = "fixed-clock";
> +		/* External ts clock is 50MHZ from PHY on EVK board. */
> +		clock-frequency = <50000000>;
> +		clock-output-names = "ext_ts_clk";
> +		#clock-cells = <0>;
> +	};

Do you need any PHY properties to turn this clock on? Or is it
strapped to be always on?

I'm surprised it is limited to Fast Ethernet. I know the Vybrid and
some of the older SoCs are Fast Ethernet only, but i thought all the
newer supported 1G?

	 Andrew