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Subject[PATCH 1/2] clk: Add debug clk summary
Date
Adds debug file "clk_summary" in /sys/kernel/debug/clk dir.
It helps to view all the clock registered in human-readable format.

For example:
clock enable_cnt prepare_cnt rate
---------------------------------------------------------------------
i2s0_sync 0 0 24000000
spdif_in_sync 0 0 24000000
spdif_mux 0 0 24000000
spdif 0 0 24000000
spdif_doubler 0 0 48000000
spdif_div 0 0 48000000
spdif_2x 0 0 48000000
clk_32k 2 2 32768
blink_override 1 1 32768
blink 1 1 32768
clk_m 2 2 12000000
clk_out_3_mux 0 0 12000000
clk_out_3 0 0 12000000
pll_ref 3 3 12000000
pll_e_mux 0 0 12000000
pll_e 0 0 100000000
cml0 0 0 100000000
cml1 0 0 100000000
pciex 0 0 100000000
pll_d2 0 0 1000000
pll_d2_out0 0 0 500000
pll_d 0 0 1000000
pll_d_out0 0 0 500000
dsib_mux 0 0 500000
dsib 0 0 500000
dsia 0 0 500000

Signed-off-by: Prashant Gaikwad <pgaikwad@nvidia.com>
---
drivers/clk/clk.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 67 insertions(+), 0 deletions(-)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 56e4495e..d79c088 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -34,6 +34,67 @@ static struct dentry *rootdir;
static struct dentry *orphandir;
static int inited = 0;

+static void clk_summary_show_one(struct seq_file *s, struct clk *c, int level)
+{
+ if (!c)
+ return;
+
+ seq_printf(s, "%*s%-*s %-11d %-12d %-10lu",
+ level * 3 + 1, "",
+ 30 - level * 3, c->name,
+ c->enable_count, c->prepare_count, c->rate);
+ seq_printf(s, "\n");
+}
+
+static void clk_summary_show_subtree(struct seq_file *s, struct clk *c,
+ int level)
+{
+ struct clk *child;
+ struct hlist_node *tmp;
+
+ if (!c)
+ return;
+
+ clk_summary_show_one(s, c, level);
+
+ hlist_for_each_entry(child, tmp, &c->children, child_node)
+ clk_summary_show_subtree(s, child, level + 1);
+}
+
+static int clk_summary_show(struct seq_file *s, void *data)
+{
+ struct clk *c;
+ struct hlist_node *tmp;
+
+ seq_printf(s, " clock enable_cnt prepare_cnt rate\n");
+ seq_printf(s, "---------------------------------------------------------------------\n");
+
+ mutex_lock(&prepare_lock);
+
+ hlist_for_each_entry(c, tmp, &clk_root_list, child_node)
+ clk_summary_show_subtree(s, c, 0);
+
+ hlist_for_each_entry(c, tmp, &clk_orphan_list, child_node)
+ clk_summary_show_subtree(s, c, 0);
+
+ mutex_unlock(&prepare_lock);
+
+ return 0;
+}
+
+
+static int clk_summary_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, clk_summary_show, inode->i_private);
+}
+
+static const struct file_operations clk_summary_fops = {
+ .open = clk_summary_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)
{
@@ -167,12 +228,18 @@ static int __init clk_debug_init(void)
{
struct clk *clk;
struct hlist_node *tmp;
+ struct dentry *d;

rootdir = debugfs_create_dir("clk", NULL);

if (!rootdir)
return -ENOMEM;

+ d = debugfs_create_file("clk_summary", S_IRUGO, rootdir, NULL,
+ &clk_summary_fops);
+ if (!d)
+ return -ENOMEM;
+
orphandir = debugfs_create_dir("orphans", rootdir);

if (!orphandir)
--
1.7.4.1


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