board/theobroma-systems/puma_rk3399/puma-rk3399.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
 */

#include <dm.h>
#include <syscon.h>
#include <dm/pinctrl.h>
#include <asm/arch-rockchip/clock.h>
#include <asm/arch-rockchip/hardware.h>
#include <asm/arch-rockchip/grf_rk3399.h>
#include "../common/common.h"

static void setup_iodomain(void)
{
	const u32 GRF_IO_VSEL_GPIO4CD_SHIFT = 3;
	struct rk3399_grf_regs *grf =
	    syscon_get_first_range(ROCKCHIP_SYSCON_GRF);

	/*
	 * Set bit 3 in GRF_IO_VSEL so PCIE_RST# works (pin GPIO4_C6).
	 * Linux assumes that PCIE_RST# works out of the box as it probes
	 * PCIe before loading the iodomain driver.
	 */
	rk_setreg(&grf->io_vsel, 1 << GRF_IO_VSEL_GPIO4CD_SHIFT);
}

int rockchip_early_misc_init_r(void)
{
	setup_iodomain();
	setup_boottargets();

	return 0;
}