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/mach-at91/include/mach/at91_pit.h

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/*
* [origin: Linux kernel include/asm-arm/arch-at91/at91_pit.h]
*
* Copyright (C) 2007 Andrew Victor
* Copyright (C) 2007 Atmel Corporation.
*
* Periodic Interval Timer (PIT) - System peripherals regsters.
* Based on AT91SAM9261 datasheet revision D.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef AT91_PIT_H
#define AT91_PIT_H
typedef struct at91_pit {
u32 mr; /* 0x00 Mode Register */
u32 sr; /* 0x04 Status Register */
u32 pivr; /* 0x08 Periodic Interval Value Register */
u32 piir; /* 0x0C Periodic Interval Image Register */
} at91_pit_t;
#define AT91_PIT_MR_IEN 0x02000000
#define AT91_PIT_MR_EN 0x01000000
#define AT91_PIT_MR_PIV_MASK(x) (x & 0x000fffff)
#define AT91_PIT_MR_PIV(x) (x & AT91_PIT_MR_PIV_MASK)
#endif