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ARM: SAMSUNG: add clock_tree debugfs file in clock 

Add a clock/clock_tree debugfs file that shows the entire clock
hierarchy including usage counts and rates.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
[kgene.kim@samsung.com: silence checkpatch complaining]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Colin Cross 2012-10-23 19:11:04 +09:00 committed by Kukjin Kim
parent 6f0c0580b7
commit 52569e2f17
1 changed files with 64 additions and 1 deletions
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65
arch/arm/plat-samsung/clock.c
View File

@ -389,6 +389,64 @@ int __init s3c24xx_register_baseclocks(unsigned long xtal)
static struct dentry *clk_debugfs_root;
static void clock_tree_show_one(struct seq_file *s, struct clk *c, int level)
{
struct clk *child;
const char *state;
char buf[255] = { 0 };
int n = 0;
if (c->name)
n = snprintf(buf, sizeof(buf) - 1, "%s", c->name);
if (c->devname)
n += snprintf(buf + n, sizeof(buf) - 1 - n, ":%s", c->devname);
state = (c->usage > 0) ? "on" : "off";
seq_printf(s, "%*s%-*s %-6s %-3d %-10lu\n",
level * 3 + 1, "",
50 - level * 3, buf,
state, c->usage, clk_get_rate(c));
list_for_each_entry(child, &clocks, list) {
if (child->parent != c)
continue;
clock_tree_show_one(s, child, level + 1);
}
}
static int clock_tree_show(struct seq_file *s, void *data)
{
struct clk *c;
unsigned long flags;
seq_printf(s, " clock state ref rate\n");
seq_printf(s, "----------------------------------------------------\n");
spin_lock_irqsave(&clocks_lock, flags);
list_for_each_entry(c, &clocks, list)
if (c->parent == NULL)
clock_tree_show_one(s, c, 0);
spin_unlock_irqrestore(&clocks_lock, flags);
return 0;
}
static int clock_tree_open(struct inode *inode, struct file *file)
{
return single_open(file, clock_tree_show, inode->i_private);
}
static const struct file_operations clock_tree_fops = {
.open = clock_tree_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int clk_debugfs_register_one(struct clk *c)
{
int err;
@ -446,13 +504,18 @@ static int __init clk_debugfs_init(void)
{
struct clk *c;
struct dentry *d;
int err;
int err = -ENOMEM;
d = debugfs_create_dir("clock", NULL);
if (!d)
return -ENOMEM;
clk_debugfs_root = d;
d = debugfs_create_file("clock_tree", S_IRUGO, clk_debugfs_root, NULL,
&clock_tree_fops);
if (!d)
goto err_out;
list_for_each_entry(c, &clocks, list) {
err = clk_debugfs_register(c);
if (err)