drivers/clk/clk-bcm2835.c

   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
  26 static const struct of_device_id clk_match[] __initconst = {
  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  */
  36 void __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 }