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/include/dt-bindings/gpio/x86-gpio.h

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/*
* This header provides constants for binding intel,x86-pinctrl.
*/
#ifndef _DT_BINDINGS_GPIO_X86_GPIO_H
#define _DT_BINDINGS_GPIO_X86_GPIO_H
#include <dt-bindings/gpio/gpio.h>
#define GPIO_MODE_NATIVE 0
#define GPIO_MODE_GPIO 1
#define GPIO_MODE_FUNC0 0
#define GPIO_MODE_FUNC1 1
#define GPIO_MODE_FUNC2 2
#define GPIO_MODE_FUNC3 3
#define GPIO_MODE_FUNC4 4
#define GPIO_MODE_FUNC5 5
#define GPIO_MODE_FUNC6 6
#define PIN_INPUT 0
#define PIN_OUTPUT 1
#define PIN_INPUT_NOPULL 0
#define PIN_INPUT_PULLUP 1
#define PIN_INPUT_PULLDOWN 2
#define PULL_STR_2K 0
#define PULL_STR_20K 2
#endif