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

From: Andrew Lunn <[email-masked]>
Date: Mon, 11 Jul 2022 09:02:15 +0200

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 <[email-masked]>
> ---
> 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@80000000 {
>  		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