linux/arch/arm/mach-ep93xx/hardware.h
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   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * arch/arm/mach-ep93xx/include/mach/hardware.h
   4 */
   5
   6#ifndef __ASM_ARCH_HARDWARE_H
   7#define __ASM_ARCH_HARDWARE_H
   8
   9#include "platform.h"
  10
  11/*
  12 * The EP93xx has two external crystal oscillators.  To generate the
  13 * required high-frequency clocks, the processor uses two phase-locked-
  14 * loops (PLLs) to multiply the incoming external clock signal to much
  15 * higher frequencies that are then divided down by programmable dividers
  16 * to produce the needed clocks.  The PLLs operate independently of one
  17 * another.
  18 */
  19#define EP93XX_EXT_CLK_RATE     14745600
  20#define EP93XX_EXT_RTC_RATE     32768
  21
  22#define EP93XX_KEYTCHCLK_DIV4   (EP93XX_EXT_CLK_RATE / 4)
  23#define EP93XX_KEYTCHCLK_DIV16  (EP93XX_EXT_CLK_RATE / 16)
  24
  25#endif
  26