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How do I set the ENET_REF_CLK rate

Question asked by Michael Worster on Oct 14, 2016
Latest reply on Oct 15, 2016 by Michael Worster

I have a design which uses an i.MX6DL processor, my base design makes use of the Ethernet in RMII mode and uses the GPIO_16 to provide the ENET_REF_CLK. Here is the setup from my device tree:


&fec {
    pinctrl-names = "default";
    pinctrl-0 = <&pinctrl_enet>;
    phy-mode = "rmii";
    phy-reset-gpios = <&gpio5 14 0>;
    status = "okay";


What I'm seeing is the Ethernet clock is running at 125MHz and I need it running at 50MHz, I was assuming there would be a max-frequency option in the device tree, but I couldn't find any such entry in the fsl-fec.txt file.


Is there a way to limit the clock rate in the device tree?


If not, how should this be handled?