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

Andrew Lunn
2022-07-11T07:02:38Z

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@nxp.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@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