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/spi.h

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/*
* Copyright 2011 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __MXC_SPI_H_
#define __MXC_SPI_H_
/*
* Board-level chip-select callback
* Should return GPIO # to be used for chip-select
*/
int board_spi_cs_gpio(unsigned bus, unsigned cs);
#endif