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-am33xx/gpio.h

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/*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _GPIO_AM33xx_H
#define _GPIO_AM33xx_H
#include <asm/omap_gpio.h>
#define OMAP_MAX_GPIO 128
#define AM33XX_GPIO0_BASE 0x44E07000
#define AM33XX_GPIO1_BASE 0x4804C000
#define AM33XX_GPIO2_BASE 0x481AC000
#define AM33XX_GPIO3_BASE 0x481AE000
#define AM33XX_GPIO4_BASE 0x48320000
#define AM33XX_GPIO5_BASE 0x48322000
/* GPIO CTRL register */
#define GPIO_CTRL_DISABLEMODULE_SHIFT 0
#define GPIO_CTRL_DISABLEMODULE_MASK (1 << 0)
#define GPIO_CTRL_ENABLEMODULE GPIO_CTRL_DISABLEMODULE_MASK
/* GPIO OUTPUT ENABLE register */
#define GPIO_OE_ENABLE(x) (1 << x)
/* GPIO SETDATAOUT register */
#define GPIO_SETDATAOUT(x) (1 << x)
#endif /* _GPIO_AM33xx_H */