1 files changed, 119 insertions, 1 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index a291a6b9cd44..cd0ca0768eed 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -3556,7 +3556,18 @@ static struct class regulator_class = {
 
 static void rdev_init_debugfs(struct regulator_dev *rdev)
 {
-        rdev->debugfs = debugfs_create_dir(rdev_get_name(rdev), debugfs_root);
+        struct device *parent = rdev->dev.parent;
+        const char *rname = rdev_get_name(rdev);
+        char name[NAME_MAX];
+
+        /* Avoid duplicate debugfs directory names */
+        if (parent && rname == rdev->desc->name) {
+                snprintf(name, sizeof(name), "%s-%s", dev_name(parent),
+                         rname);
+                rname = name;
+        }
+
+        rdev->debugfs = debugfs_create_dir(rname, debugfs_root);
         if (!rdev->debugfs) {
                 rdev_warn(rdev, "Failed to create debugfs directory\n");
                 return;
@@ -3963,6 +3974,110 @@ static const struct file_operations supply_map_fops = {
 #endif
 };
 
+#ifdef CONFIG_DEBUG_FS
+static void regulator_summary_show_subtree(struct seq_file *s,
+                                           struct regulator_dev *rdev,
+                                           int level)
+{
+        struct list_head *list = s->private;
+        struct regulator_dev *child;
+        struct regulation_constraints *c;
+        struct regulator *consumer;
+
+        if (!rdev)
+                return;
+
+        seq_printf(s, "%*s%-*s %3d %4d %6d ",
+                   level * 3 + 1, "",
+                   30 - level * 3, rdev_get_name(rdev),
+                   rdev->use_count, rdev->open_count, rdev->bypass_count);
+
+        seq_printf(s, "%5dmV ", _regulator_get_voltage(rdev) / 1000);
+        seq_printf(s, "%5dmA ", _regulator_get_current_limit(rdev) / 1000);
+
+        c = rdev->constraints;
+        if (c) {
+                switch (rdev->desc->type) {
+                case REGULATOR_VOLTAGE:
+                        seq_printf(s, "%5dmV %5dmV ",
+                                   c->min_uV / 1000, c->max_uV / 1000);
+                        break;
+                case REGULATOR_CURRENT:
+                        seq_printf(s, "%5dmA %5dmA ",
+                                   c->min_uA / 1000, c->max_uA / 1000);
+                        break;
+                }
+        }
+
+        seq_puts(s, "\n");
+
+        list_for_each_entry(consumer, &rdev->consumer_list, list) {
+                if (consumer->dev->class == &regulator_class)
+                        continue;
+
+                seq_printf(s, "%*s%-*s ",
+                           (level + 1) * 3 + 1, "",
+                           30 - (level + 1) * 3, dev_name(consumer->dev));
+
+                switch (rdev->desc->type) {
+                case REGULATOR_VOLTAGE:
+                        seq_printf(s, "%37dmV %5dmV",
+                                   consumer->min_uV / 1000,
+                                   consumer->max_uV / 1000);
+                        break;
+                case REGULATOR_CURRENT:
+                        break;
+                }
+
+                seq_puts(s, "\n");
+        }
+
+        list_for_each_entry(child, list, list) {
+                /* handle only non-root regulators supplied by current rdev */
+                if (!child->supply || child->supply->rdev != rdev)
+                        continue;
+
+                regulator_summary_show_subtree(s, child, level + 1);
+        }
+}
+
+static int regulator_summary_show(struct seq_file *s, void *data)
+{
+        struct list_head *list = s->private;
+        struct regulator_dev *rdev;
+
+        seq_puts(s, " regulator                      use open bypass voltage current     min     max\n");
+        seq_puts(s, "-------------------------------------------------------------------------------\n");
+
+        mutex_lock(&regulator_list_mutex);
+
+        list_for_each_entry(rdev, list, list) {
+                if (rdev->supply)
+                        continue;
+
+                regulator_summary_show_subtree(s, rdev, 0);
+        }
+
+        mutex_unlock(&regulator_list_mutex);
+
+        return 0;
+}
+
+static int regulator_summary_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, regulator_summary_show, inode->i_private);
+}
+#endif
+
+static const struct file_operations regulator_summary_fops = {
+#ifdef CONFIG_DEBUG_FS
+        .open           = regulator_summary_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+#endif
+};
+
 static int __init regulator_init(void)
 {
         int ret;
@@ -3976,6 +4091,9 @@ static int __init regulator_init(void)
         debugfs_create_file("supply_map", 0444, debugfs_root, NULL,
                             &supply_map_fops);
 
+        debugfs_create_file("regulator_summary", 0444, debugfs_root,
+                            &regulator_list, &regulator_summary_fops);
+
         regulator_dummy_init();
 
         return ret;