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Message-ID: <1355370586-6600-1-git-send-email-pgaikwad@nvidia.com>
Date: Thu, 13 Dec 2012 09:19:46 +0530
From: Prashant Gaikwad <pgaikwad@...dia.com>
To: <mturquette@...aro.org>, <swarren@...dia.com>
CC: <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
Prashant Gaikwad <pgaikwad@...dia.com>
Subject: [PATCH] clk: debug clock tree
Adds debug file "clock_tree" in /sys/kernel/debug/clk dir.
It helps to view all the clock registered in tree 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@...dia.com>
---
drivers/clk/clk.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 59 insertions(+), 0 deletions(-)
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 56e4495e..7daf201 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -34,6 +34,59 @@ static struct dentry *rootdir;
static struct dentry *orphandir;
static int inited = 0;
+static void clk_tree_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_tree_show_subtree(struct seq_file *s, struct clk *c, int level)
+{
+ struct clk *child;
+ struct hlist_node *tmp;
+
+ if (!c)
+ return;
+
+ clk_tree_show_one(s, c, level);
+
+ hlist_for_each_entry(child, tmp, &c->children, child_node)
+ clk_tree_show_subtree(s, child, level + 1);
+}
+
+static int clk_tree_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");
+
+ hlist_for_each_entry(c, tmp, &clk_root_list, child_node)
+ clk_tree_show_subtree(s, c, 0);
+
+ return 0;
+}
+
+
+static int clk_tree_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, clk_tree_show, inode->i_private);
+}
+
+static const struct file_operations clk_tree_fops = {
+ .open = clk_tree_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 +220,18 @@ 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("clock_tree", S_IRUGO, rootdir, NULL,
+ &clk_tree_fops);
+ if (!d)
+ return -ENOMEM;
+
orphandir = debugfs_create_dir("orphans", rootdir);
if (!orphandir)
--
1.7.4.1
--
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