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/of.h>
24
25 /*
26 * These are fixed clocks. They're probably not all root clocks and it may
27 * be possible to turn them on and off but until this is mapped out better
28 * it's the only way they can be used.
29 */
bcm2835_init_clocks(void)30 void __init bcm2835_init_clocks(void)
31 {
32 struct clk *clk;
33 int ret;
34
35 clk = clk_register_fixed_rate(NULL, "sys_pclk", NULL, CLK_IS_ROOT,
36 250000000);
37 if (IS_ERR(clk))
38 pr_err("sys_pclk not registered\n");
39
40 clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT,
41 126000000);
42 if (IS_ERR(clk))
43 pr_err("apb_pclk not registered\n");
44
45 clk = clk_register_fixed_rate(NULL, "uart0_pclk", NULL, CLK_IS_ROOT,
46 3000000);
47 if (IS_ERR(clk))
48 pr_err("uart0_pclk not registered\n");
49 ret = clk_register_clkdev(clk, NULL, "20201000.uart");
50 if (ret)
51 pr_err("uart0_pclk alias not registered\n");
52
53 clk = clk_register_fixed_rate(NULL, "uart1_pclk", NULL, CLK_IS_ROOT,
54 125000000);
55 if (IS_ERR(clk))
56 pr_err("uart1_pclk not registered\n");
57 ret = clk_register_clkdev(clk, NULL, "20215000.uart");
58 if (ret)
59 pr_err("uart1_pclk alias not registered\n");
60 }
61