upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/arch/arm/include/asm/imx-common/mxc_i2c.h

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/*
* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_ARCH_MXC_MXC_I2C_H__
#define __ASM_ARCH_MXC_MXC_I2C_H__
#include <asm/imx-common/iomux-v3.h>
struct i2c_pin_ctrl {
iomux_v3_cfg_t i2c_mode;
iomux_v3_cfg_t gpio_mode;
unsigned char gp;
unsigned char spare;
};
struct i2c_pads_info {
struct i2c_pin_ctrl scl;
struct i2c_pin_ctrl sda;
};
void setup_i2c(unsigned i2c_index, int speed, int slave_addr,
struct i2c_pads_info *p);
void bus_i2c_init(void *base, int speed, int slave_addr,
int (*idle_bus_fn)(void *p), void *p);
int bus_i2c_read(void *base, uchar chip, uint addr, int alen, uchar *buf,
int len);
int bus_i2c_write(void *base, uchar chip, uint addr, int alen,
const uchar *buf, int len);
#endif