PM / OPP: add a summary tree in debugfs

On rk3399-evb-rev3 the opp_summary would for example look something like:
 device                rate(Hz)    target(uV)    min(uV)    max(uV)
-------------------------------------------------------------------
 platform-dmc
                      200000000       825000      825000      825000
                      300000000       850000      850000      850000
                      400000000       850000      850000      850000
                      528000000       900000      900000      900000
                      600000000       900000      900000      900000
                      800000000       900000      900000      900000
 platform-ff9a0000.gpu
                      200000000       800000      800000      800000
                      297000000       800000      800000      800000
                      400000000       825000      825000      825000
                      500000000       875000      875000      875000
                      600000000       925000      925000      925000
                      800000000      1100000     1100000     1100000
 cpu4
                      408000000       800000      800000      800000
                      600000000       800000      800000      800000
                      816000000       800000      800000      800000
                     1008000000       850000      850000      850000
                     1200000000       875000      875000      875000
                     1416000000       975000      975000      975000
                     1608000000      1025000     1025000     1025000
                     1800000000      1125000     1125000     1125000
 cpu0
                      408000000       800000      800000      800000
                      600000000       800000      800000      800000
                      816000000       800000      800000      800000
                     1008000000       850000      850000      850000
                     1200000000       925000      925000      925000
                     1416000000      1050000     1050000     1050000

Change-Id: I0d33bb84fd36d79df3c1630d98c84f1f6bc42728
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index 9d7bec3bbbcfe15ac7dd3e3bcd06795b3021deba..1cc0d9ab358dbd64656b15daa6ac72a5da3f6726 100644 (file)
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -2156,3 +2156,63 @@ int dev_pm_opp_of_add_table(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
 #endif
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+
+static int opp_summary_show(struct seq_file *s, void *data)
+{
+       struct list_head *lists = (struct list_head *)s->private;
+       struct opp_table *opp_table;
+       struct dev_pm_opp *opp;
+
+       mutex_lock(&opp_table_lock);
+
+       seq_puts(s, " device                rate(Hz)    target(uV)    min(uV)    max(uV)\n");
+       seq_puts(s, "-------------------------------------------------------------------\n");
+
+       list_for_each_entry_rcu(opp_table, lists, node) {
+               seq_printf(s, " %s\n", opp_table->dentry_name);
+               list_for_each_entry(opp, &opp_table->opp_list, node) {
+                       seq_printf(s, "%31lu %12lu %11lu %11lu\n",
+                                  opp->rate,
+                                  opp->u_volt,
+                                  opp->u_volt_min,
+                                  opp->u_volt_max);
+               }
+       }
+
+       mutex_unlock(&opp_table_lock);
+
+       return 0;
+}
+
+static int opp_summary_open(struct inode *inode, struct file *file)
+{
+       return single_open(file, opp_summary_show, inode->i_private);
+}
+
+static const struct file_operations opp_summary_fops = {
+       .open           = opp_summary_open,
+       .read           = seq_read,
+       .llseek         = seq_lseek,
+       .release        = single_release,
+};
+
+static int __init opp_debug_init(void)
+{
+       struct dentry *parent, *d;
+
+       parent = debugfs_lookup("opp", NULL);
+       if (!parent)
+               return -ENOMEM;
+
+       d = debugfs_create_file("opp_summary", 0444, parent, &opp_tables,
+                               &opp_summary_fops);
+       if (!d)
+               return -ENOMEM;
+
+       return 0;
+}
+late_initcall(opp_debug_init);
+#endif