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/arch-sunxi/pmic_bus.h

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* (C) Copyright 2015 Hans de Goede <hdegoede@redhat.com>
*
* Sunxi PMIC bus access helpers header
*/
#ifndef _SUNXI_PMIC_BUS_H
#define _SUNXI_PMIS_BUS_H
int pmic_bus_init(void);
int pmic_bus_read(u8 reg, u8 *data);
int pmic_bus_write(u8 reg, u8 data);
int pmic_bus_setbits(u8 reg, u8 bits);
int pmic_bus_clrbits(u8 reg, u8 bits);
#endif