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-stv0991/gpio.h

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/*
* (C) Copyright 2014
* Vikas Manocha, ST Micoelectronics, vikas.manocha@st.com
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_ARCH_STV0991_GPIO_H
#define __ASM_ARCH_STV0991_GPIO_H
enum gpio_direction {
GPIO_DIRECTION_IN,
GPIO_DIRECTION_OUT,
};
struct gpio_regs {
u32 data; /* offset 0x0 */
u32 reserved[0xff]; /* 0x4--0x3fc */
u32 dir; /* offset 0x400 */
};
#endif /* __ASM_ARCH_STV0991_GPIO_H */