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/drivers/misc/mc9sdz60.c

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/*
* (C) Copyright 2010 Stefano Babic <sbabic@denx.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <config.h>
#include <common.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <i2c.h>
#include <mc9sdz60.h>
#ifndef CONFIG_SYS_FSL_MC9SDZ60_I2C_ADDR
#error "You have to configure I2C address for MC9SDZ60"
#endif
u8 mc9sdz60_reg_read(enum mc9sdz60_reg reg)
{
u8 val;
if (i2c_read(CONFIG_SYS_FSL_MC9SDZ60_I2C_ADDR, reg, 1, &val, 1)) {
puts("Error reading MC9SDZ60 register\n");
return -1;
}
return val;
}
void mc9sdz60_reg_write(enum mc9sdz60_reg reg, u8 val)
{
i2c_write(CONFIG_SYS_FSL_MC9SDZ60_I2C_ADDR, reg, 1, &val, 1);
}