We are developing vehicle applications using imx8mp. FEC connects the RTL8211 and connects the marvell's 88X2220 using eqos.FEC connects fine, 88X2220 connects at 100M, but gigabit ethernet doesn't work(No RX Packet). When loading the driver, everything is printed normally without any errors.
Linux kernel version is Linux imx8mp-lpddr4-evk 5.10.72-lts-5.10.
If we observe the rx clock on the rgmii side of the nxp, the signal comes out, but but the swinging voltage moves from 0.8V to 1.2V.
If we cut off the input to nxp, the waveform normally comes out as 0V ~1.8V.
I tried to pull up the register in the device tree, but there is no voltage change at all.
Below is the device tree we use.
=============================================================================
&eqos {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_eqos>;
phy-mode = "rgmii";
phy-handle = <ðphy0>;
status = "okay";
mdio {
compatible = "snps,dwmac-mdio";
#address-cells = <1>;
#size-cells = <0>;
ethphy0: ethernet-phy@7 {
compatible = "ethernet-phy-ieee802.3-c45";
reg = <7>;
};
};
fixed-link {
speed = <1000>;
full-duplex;
};
};
pinctrl_eqos: eqosgrp {
fsl,pins = <
MX8MP_IOMUXC_ENET_MDC__ENET_QOS_MDC 0x3
MX8MP_IOMUXC_ENET_MDIO__ENET_QOS_MDIO 0x3
MX8MP_IOMUXC_ENET_RD0__ENET_QOS_RGMII_RD0 0x91
MX8MP_IOMUXC_ENET_RD1__ENET_QOS_RGMII_RD1 0x91
MX8MP_IOMUXC_ENET_RD2__ENET_QOS_RGMII_RD2 0x91
MX8MP_IOMUXC_ENET_RD3__ENET_QOS_RGMII_RD3 0x91
MX8MP_IOMUXC_ENET_RXC__CCM_ENET_QOS_CLOCK_GENERATE_RX_CLK 0x91 ==> 0x1c4
MX8MP_IOMUXC_ENET_RX_CTL__ENET_QOS_RGMII_RX_CTL 0x91
MX8MP_IOMUXC_ENET_TD0__ENET_QOS_RGMII_TD0 0x1f
MX8MP_IOMUXC_ENET_TD1__ENET_QOS_RGMII_TD1 0x1f
MX8MP_IOMUXC_ENET_TD2__ENET_QOS_RGMII_TD2 0x1f
MX8MP_IOMUXC_ENET_TD3__ENET_QOS_RGMII_TD3 0x1f
MX8MP_IOMUXC_ENET_TX_CTL__ENET_QOS_RGMII_TX_CTL 0x1f
MX8MP_IOMUXC_ENET_TXC__CCM_ENET_QOS_CLOCK_GENERATE_TX_CLK 0x1f
MX8MP_IOMUXC_SAI2_RXC__GPIO4_IO22 0x19
>;
};
=====================================================================
For the marvell 88Q2220, mdio is a c45 clause. does that have anything to do with it?
How can I solve it?
