1 /* 2 * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 #include <imx_regs.h> 7 #include <imx_clock.h> 8 9 static void imx7_clock_uart_init(void) 10 { 11 unsigned int i; 12 13 for (i = 0; i < MXC_MAX_UART_NUM; i++) 14 imx_clock_disable_uart(i); 15 } 16 17 static void imx7_clock_wdog_init(void) 18 { 19 unsigned int i; 20 21 for (i = 0; i < MXC_MAX_WDOG_NUM; i++) 22 imx_clock_disable_wdog(i); 23 } 24 25 void imx_clock_init(void) 26 { 27 /* 28 * The BootROM hands off to the next stage with the internal 24 MHz XTAL 29 * crystal already clocking the main PLL, which is very handy. 30 * Here we should enable whichever peripherals are required for ATF and 31 * OPTEE. 32 * 33 * Subsequent stages in the boot process such as u-boot and Linux 34 * already have a significant and mature code-base around clocks, so our 35 * objective should be to enable what we need for ATF/OPTEE without 36 * breaking any existing upstream code in Linux and u-boot. 37 */ 38 39 /* Initialize UART clocks */ 40 imx7_clock_uart_init(); 41 42 /* Watchdog clocks */ 43 imx7_clock_wdog_init(); 44 } 45