From bddca8944a7ab6699984c4b1b677261eb1c8d819 Mon Sep 17 00:00:00 2001 From: Prashant Gaikwad Date: Wed, 26 Dec 2012 19:16:23 +0530 Subject: 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 Signed-off-by: Mike Turquette --- drivers/clk/clk.c | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c index 8622b9de7302..593a2e42d4af 100644 --- a/drivers/clk/clk.c +++ b/drivers/clk/clk.c @@ -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) -- cgit v1.2.3