Device tree source File

[Elias_M]

can someone tell me if the phy-supply "phy-supply = <&reg_3v3_eth0>;" proprety in the ccimx8mn-dvk.dts is the supply voltage of the Fast ethernet controller (FEC1) VDD_ENET ?

in the schematic of the devlopment Kit, there is VDD_ENET connected to 1.8v.

can somone give me an explanation for this ?

I am using an SOM connect core 8M Nano based on the IMX8MN but using the KSZ9131 a different Ethernet transceiver  than the one used in the develpment Kit the AR8031

[JorgeCas]

Hello,

This is the voltage level of I/O for the PHY, does not necessarily the same as the core voltage or the voltage used by the MAC in i.MX8MN side for power management.

These voltages should match, if not I suggest you do the change it the correct voltage level.

Please check if this mismatch is just the name of the label used in manufacturer source code.

Best regards.

[Elias_M]

this is the fec1 linux dts node for the board : 

&fec1 {

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_fec1_gpio>,

    <&pinctrl_fec1>;

phy-mode = "rgmii-id";

phy-handle = <&ethphy0>;

digi,mdio-lt-supply = <&reg_1v8_ext>;

phy-supply = <&reg_3v3_eth0>;

phy-reset-gpios = <&gpio5 3 GPIO_ACTIVE_LOW>;

phy-reset-duration = <1>;

digi,phy-reset-in-suspend;

fsl,magic-packet;

status = "okay";

mdio {

#address-cells = <1>;

#size-cells = <0>;

ethphy0: ethernet-phy@0 {

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

reg = <0>;

at803x,eee-disabled;

at803x,vddio-1p8v;

};

};

};

reg_3v3_eth0: regulator@3 {
compatible = "regulator-fixed";
reg = <3>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_reg_3v3_eth0>;
regulator-name = "3v3_eth0";
regulator-min-microvolt = <3300000>;
regulator-max-microvolt = <3300000>;
gpio = <&gpio5 4 GPIO_ACTIVE_HIGH>;
enable-active-high;
startup-delay-us = <10000>;
vin-supply = <&reg_3v3_ext>;
};