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: Prashant Gaikwad <pgaikwad@nvidia.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index eea70da02500..8622b9de7302 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -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)