linux/drivers/clk/clk-bcm2835.c
<<
>>
Prefs
   1/*
   2 * Copyright (C) 2010 Broadcom
   3 * Copyright (C) 2012 Stephen Warren
   4 *
   5 * This program is free software; you can redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; either version 2 of the License, or
   8 * (at your option) any later version.
   9 *
  10 * This program is distributed in the hope that it will be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write to the Free Software
  17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18 */
  19
  20#include <linux/clk-provider.h>
  21#include <linux/clkdev.h>
  22#include <linux/clk/bcm2835.h>
  23#include <linux/clk-provider.h>
  24#include <linux/of.h>
  25
  26static const __initconst struct of_device_id clk_match[] = {
  27        { .compatible = "fixed-clock", .data = of_fixed_clk_setup, },
  28        { }
  29};
  30
  31/*
  32 * These are fixed clocks. They're probably not all root clocks and it may
  33 * be possible to turn them on and off but until this is mapped out better
  34 * it's the only way they can be used.
  35 */
  36void __init bcm2835_init_clocks(void)
  37{
  38        struct clk *clk;
  39        int ret;
  40
  41        clk = clk_register_fixed_rate(NULL, "sys_pclk", NULL, CLK_IS_ROOT,
  42                                        250000000);
  43        if (IS_ERR(clk))
  44                pr_err("sys_pclk not registered\n");
  45
  46        clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT,
  47                                        126000000);
  48        if (IS_ERR(clk))
  49                pr_err("apb_pclk not registered\n");
  50
  51        clk = clk_register_fixed_rate(NULL, "uart0_pclk", NULL, CLK_IS_ROOT,
  52                                        3000000);
  53        if (IS_ERR(clk))
  54                pr_err("uart0_pclk not registered\n");
  55        ret = clk_register_clkdev(clk, NULL, "20201000.uart");
  56        if (ret)
  57                pr_err("uart0_pclk alias not registered\n");
  58
  59        clk = clk_register_fixed_rate(NULL, "uart1_pclk", NULL, CLK_IS_ROOT,
  60                                        125000000);
  61        if (IS_ERR(clk))
  62                pr_err("uart1_pclk not registered\n");
  63        ret = clk_register_clkdev(clk, NULL, "20215000.uart");
  64        if (ret)
  65                pr_err("uart1_pclk alias not registered\n");
  66
  67        of_clk_init(clk_match);
  68}
  69
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.