u-boot/arch/arm/mach-rockchip/rk3288/rk3288.c

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/*
* Copyright (c) 2016 Rockchip Electronics Co., Ltd
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <asm/io.h>
#include <asm/arch/hardware.h>
#define GRF_SOC_CON2 0x24c
int arch_cpu_init(void)
{
/* We do some SoC one time setting here. */
/* Use rkpwm by default */
rk_setreg(GRF_SOC_CON2, 1 << 0);
return 0;
}