u-boot/board/beacon/imx8mm/imx8mm_beacon.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2020 Compass Electronics Group, LLC
 */

#include <common.h>
#include <miiphy.h>
#include <netdev.h>
#include <asm/global_data.h>

#include <asm/arch/clock.h>
#include <asm/arch/sys_proto.h>
#include <asm/io.h>

DECLARE_GLOBAL_DATA_PTR;

#if IS_ENABLED(CONFIG_FEC_MXC)
static int setup_fec(void)
{
	struct iomuxc_gpr_base_regs *gpr =
		(struct iomuxc_gpr_base_regs *)IOMUXC_GPR_BASE_ADDR;

	/* Use 125M anatop REF_CLK1 for ENET1, not from external */
	clrsetbits_le32(&gpr->gpr[1], 0x2000, 0);

	return 0;
}

int board_phy_config(struct phy_device *phydev)
{
	/* enable rgmii rxc skew and phy mode select to RGMII copper */
	phy_write(phydev, MDIO_DEVAD_NONE, 0x1d, 0x1f);
	phy_write(phydev, MDIO_DEVAD_NONE, 0x1e, 0x8);

	phy_write(phydev, MDIO_DEVAD_NONE, 0x1d, 0x00);
	phy_write(phydev, MDIO_DEVAD_NONE, 0x1e, 0x82ee);
	phy_write(phydev, MDIO_DEVAD_NONE, 0x1d, 0x05);
	phy_write(phydev, MDIO_DEVAD_NONE, 0x1e, 0x100);

	if (phydev->drv->config)
		phydev->drv->config(phydev);
	return 0;
}
#endif

int board_init(void)
{
	if (IS_ENABLED(CONFIG_FEC_MXC))
		setup_fec();

	return 0;
}