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clk: JSON debugfs clock tree summary 

Clock information is dumped in JSON format which is easy
for machines to parse.

Each clock is represented as an object which has same name as
clock and following properties
	- enable_count
	- prepare_count
	- rate

Output is verified using online JSON editor.

Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Prashant Gaikwad 2012-12-26 19:16:23 +05:30 committed by Mike Turquette
parent 1af599df6b
commit bddca8944a
1 changed files with 75 additions and 0 deletions
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75
drivers/clk/clk.c
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@ -96,6 +96,76 @@ static const struct file_operations clk_summary_fops = {
.release = single_release,
};
static void clk_dump_one(struct seq_file *s, struct clk *c, int level)
{
if (!c)
return;
seq_printf(s, "\"%s\": { ", c->name);
seq_printf(s, "\"enable_count\": %d,", c->enable_count);
seq_printf(s, "\"prepare_count\": %d,", c->prepare_count);
seq_printf(s, "\"rate\": %lu", c->rate);
}
static void clk_dump_subtree(struct seq_file *s, struct clk *c, int level)
{
struct clk *child;
struct hlist_node *tmp;
if (!c)
return;
clk_dump_one(s, c, level);
hlist_for_each_entry(child, tmp, &c->children, child_node) {
seq_printf(s, ",");
clk_dump_subtree(s, child, level + 1);
}
seq_printf(s, "}");
}
static int clk_dump(struct seq_file *s, void *data)
{
struct clk *c;
struct hlist_node *tmp;
bool first_node = true;
seq_printf(s, "{");
mutex_lock(&prepare_lock);
hlist_for_each_entry(c, tmp, &clk_root_list, child_node) {
if (!first_node)
seq_printf(s, ",");
first_node = false;
clk_dump_subtree(s, c, 0);
}
hlist_for_each_entry(c, tmp, &clk_orphan_list, child_node) {
seq_printf(s, ",");
clk_dump_subtree(s, c, 0);
}
mutex_unlock(&prepare_lock);
seq_printf(s, "}");
return 0;
}
static int clk_dump_open(struct inode *inode, struct file *file)
{
return single_open(file, clk_dump, inode->i_private);
}
static const struct file_operations clk_dump_fops = {
.open = clk_dump_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
/* caller must hold prepare_lock */
static int clk_debug_create_one(struct clk *clk, struct dentry *pdentry)
{
@ -241,6 +311,11 @@ static int __init clk_debug_init(void)
if (!d)
return -ENOMEM;
d = debugfs_create_file("clk_dump", S_IRUGO, rootdir, NULL,
&clk_dump_fops);
if (!d)
return -ENOMEM;
orphandir = debugfs_create_dir("orphans", rootdir);
if (!orphandir)