ARM: SAMSUNG: add clock_tree debugfs file in clock

Add a clock/clock_tree debugfs file that shows the entire clock
hierarchy including usage counts and rates.

Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
[kgene.kim@samsung.com: silence checkpatch complaining]
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

diff --git a/arch/arm/plat-samsung/clock.c b/arch/arm/plat-samsung/clock.c
index 012bbd0..36c1e67 100644 (file)
--- a/arch/arm/plat-samsung/clock.c
+++ b/arch/arm/plat-samsung/clock.c
@@ -389,6 +389,64 @@ int __init s3c24xx_register_baseclocks(unsigned long xtal)
 
 static struct dentry *clk_debugfs_root;
 
+static void clock_tree_show_one(struct seq_file *s, struct clk *c, int level)
+{
+       struct clk *child;
+       const char *state;
+       char buf[255] = { 0 };
+       int n = 0;
+
+       if (c->name)
+               n = snprintf(buf, sizeof(buf) - 1, "%s", c->name);
+
+       if (c->devname)
+               n += snprintf(buf + n, sizeof(buf) - 1 - n, ":%s", c->devname);
+
+       state = (c->usage > 0) ? "on" : "off";
+
+       seq_printf(s, "%*s%-*s %-6s %-3d %-10lu\n",
+                  level * 3 + 1, "",
+                  50 - level * 3, buf,
+                  state, c->usage, clk_get_rate(c));
+
+       list_for_each_entry(child, &clocks, list) {
+               if (child->parent != c)
+                       continue;
+
+               clock_tree_show_one(s, child, level + 1);
+       }
+}
+
+static int clock_tree_show(struct seq_file *s, void *data)
+{
+       struct clk *c;
+       unsigned long flags;
+
+       seq_printf(s, " clock state ref rate\n");
+       seq_printf(s, "----------------------------------------------------\n");
+
+       spin_lock_irqsave(&clocks_lock, flags);
+
+       list_for_each_entry(c, &clocks, list)
+               if (c->parent == NULL)
+                       clock_tree_show_one(s, c, 0);
+
+       spin_unlock_irqrestore(&clocks_lock, flags);
+       return 0;
+}
+
+static int clock_tree_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, clock_tree_show, inode->i_private);
+}
+
+static const struct file_operations clock_tree_fops = {
+       .open           = clock_tree_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
 static int clk_debugfs_register_one(struct clk *c)
 {
        int err;
@@ -446,13 +504,18 @@ static int __init clk_debugfs_init(void)
 {
        struct clk *c;
        struct dentry *d;
-       int err;
+       int err = -ENOMEM;
 
        d = debugfs_create_dir("clock", NULL);
        if (!d)
                return -ENOMEM;
        clk_debugfs_root = d;
 
+       d = debugfs_create_file("clock_tree", S_IRUGO, clk_debugfs_root, NULL,
+                                &clock_tree_fops);
+       if (!d)
+               goto err_out;
+
        list_for_each_entry(c, &clocks, list) {
                err = clk_debugfs_register(c);
                if (err)