LXR linux/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
  24/*
  25 * These are fixed clocks. They're probably not all root clocks and it may
  26 * be possible to turn them on and off but until this is mapped out better
  27 * it's the only way they can be used.
  28 */
  29void __init bcm2835_init_clocks(void)
  30{
  31        struct clk *clk;
  32        int ret;
  33
  34        clk = clk_register_fixed_rate(NULL, "sys_pclk", NULL, CLK_IS_ROOT,
  35                                        250000000);
  36        if (!clk)
  37                pr_err("sys_pclk not registered\n");
  38
  39        clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT,
  40                                        126000000);
  41        if (!clk)
  42                pr_err("apb_pclk not registered\n");
  43
  44        clk = clk_register_fixed_rate(NULL, "uart0_pclk", NULL, CLK_IS_ROOT,
  45                                        3000000);
  46        if (!clk)
  47                pr_err("uart0_pclk not registered\n");
  48        ret = clk_register_clkdev(clk, NULL, "20201000.uart");
  49        if (ret)
  50                pr_err("uart0_pclk alias not registered\n");
  51
  52        clk = clk_register_fixed_rate(NULL, "uart1_pclk", NULL, CLK_IS_ROOT,
  53                                        125000000);
  54        if (!clk)
  55                pr_err("uart1_pclk not registered\n");
  56        ret = clk_register_clkdev(clk, NULL, "20215000.uart");
  57        if (ret)
  58                pr_err("uart0_pclk alias not registered\n");
  59}
  60