Merge tag 'locks-v3.16-2' of git://git.samba.org/jlayton/linux
[linux/fpc-iii.git] / arch / arm / mach-imx / clk.c
blobedc35df7bed4a0da6d72dde245ca9257fc296805
1 #include <linux/clk.h>
2 #include <linux/err.h>
3 #include <linux/of.h>
4 #include <linux/slab.h>
5 #include <linux/spinlock.h>
6 #include "clk.h"
8 DEFINE_SPINLOCK(imx_ccm_lock);
10 static struct clk * __init imx_obtain_fixed_clock_from_dt(const char *name)
12 struct of_phandle_args phandle;
13 struct clk *clk = ERR_PTR(-ENODEV);
14 char *path;
16 path = kasprintf(GFP_KERNEL, "/clocks/%s", name);
17 if (!path)
18 return ERR_PTR(-ENOMEM);
20 phandle.np = of_find_node_by_path(path);
21 kfree(path);
23 if (phandle.np) {
24 clk = of_clk_get_from_provider(&phandle);
25 of_node_put(phandle.np);
27 return clk;
30 struct clk * __init imx_obtain_fixed_clock(
31 const char *name, unsigned long rate)
33 struct clk *clk;
35 clk = imx_obtain_fixed_clock_from_dt(name);
36 if (IS_ERR(clk))
37 clk = imx_clk_fixed(name, rate);
38 return clk;
42 * This fixups the register CCM_CSCMR1 write value.
43 * The write/read/divider values of the aclk_podf field
44 * of that register have the relationship described by
45 * the following table:
47 * write value read value divider
48 * 3b'000 3b'110 7
49 * 3b'001 3b'111 8
50 * 3b'010 3b'100 5
51 * 3b'011 3b'101 6
52 * 3b'100 3b'010 3
53 * 3b'101 3b'011 4
54 * 3b'110 3b'000 1
55 * 3b'111 3b'001 2(default)
57 * That's why we do the xor operation below.
59 #define CSCMR1_FIXUP 0x00600000
61 void imx_cscmr1_fixup(u32 *val)
63 *val ^= CSCMR1_FIXUP;
64 return;