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Commit 52569e2f authored by Colin Cross's avatar Colin Cross Committed by Kukjin Kim
Browse files

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: default avatarColin Cross <ccross@android.com>
Signed-off-by: default avatarJonghwan Choi <jhbird.choi@samsung.com>
[kgene.kim@samsung.com: silence checkpatch complaining]
Signed-off-by: default avatarKukjin Kim <kgene.kim@samsung.com>
parent 6f0c0580

arch/arm/plat-samsung/clock.c

+64 −1
Original line number Diff line number Diff line
@@ -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)