imx8mp LAN8720 reset after clock disabled

[MrNam]

I am currently facing the following problem (using an i.MX 8MP):

During boot, the clock going to the lan8720 is being disabled for ~500ms. After that, the clock comes back but there is no reset. This can cause strange behavior (100 mbit not available, only 10 mbit). I am able to reproduce this issue.

I think it is the same issue as here: https://community.nxp.com/t5/i-MX-Processors/imx6ull-doesn-t-reset-LAN8720A-after-clk-enable/m-p/128...

The problem comes from: https://source.codeaurora.org/external/imx/linux-imx/commit/drivers/net/phy/smsc.c?h=lf-5.10.y&id=d6...

When I revert this patch, the issue goes away (Reset will come when clock is re-enabled - measured with oscilloscope - I attached my measurements as images).

However, I want to properly fix this problem and not revert this patch.

My dts currently looks like this:

&fec {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_fec>;

phy-mode = "rmii";

phy-handle = <&ethphy1>;

fsl,magic-packet;

assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_266M>,

<&clk IMX8MP_SYS_PLL2_100M>,

<&clk IMX8MP_SYS_PLL2_50M>;

assigned-clock-rates = <0>, <0>, <50000000>, <100000000>;

status = "okay";

mdio {

#address-cells = <1>;

#size-cells = <0>;

ethphy1: ethernet-phy-smsc@0 {

compatible = "ethernet-phy-ieee802.3-c22";

reg = <0>;

clocks = <&clk IMX8MP_CLK_ENET_PHY_REF>;

/*

* 100MBit/s ethernet with smsc phy

* detection does not work properly between two devices

* with same phy and enabled energy detect mode.

* disable it

*/

smsc,disable-energy-detect;

/* phy reset */

reset-gpios = <&gpio4 0 GPIO_ACTIVE_LOW>;

reset-names = "phy";

reset-assert-us = <1000>;

reset-deassert-us = <1000>;

status = "okay";

};

};

};

According to https://www.spinics.net/lists/devicetree/msg385831.html it seems that I need to add the clocks parameter to my device tree. I tried that but it did not work. I am not sure if I added the correct clock. I tried:

[...]

ethphy1: ethernet-phy-smsc@0 {

compatible = "ethernet-phy-ieee802.3-c22";

reg = <0>;

clocks = <&clk IMX8MP_CLK_ENET_QOS>; //I also tried <&clk IMX8MP_CLK_ENET_REF> and <&clk IMX8MP_CLK_ENET1_ROOT>

[...] 

Can someone help me with this?