Commit 1af599df authored by Prashant Gaikwad's avatar Prashant Gaikwad Committed by Mike Turquette
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clk: human-readable debugfs clock tree summary 



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: default avatarPrashant Gaikwad <pgaikwad@nvidia.com>
Signed-off-by: default avatarMike Turquette <mturquette@linaro.org>
parent 9f58b9b9

drivers/clk/clk.c

+67 −0
Original line number Diff line number Diff line
@@ -35,6 +35,67 @@ 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)

{
@@ -168,12 +229,18 @@ 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)

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