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clk: human-readable debugfs clock tree summary

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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>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Prashant Gaikwad 2012-12-26 19:16:22 +05:30 committed by Mike Turquette
parent 9f58b9b9fe
commit 1af599df6b
1 changed files with 67 additions and 0 deletions
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67
drivers/clk/clk.c
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@ -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)