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clk: JSON debugfs clock tree summary

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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)