phy: core: add debugfs files

Add a debugfs root for phy class, and create a debugfs directory under
the root when create phy, then phy drivers can add debugfs files.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20230513092218.21139-1-chunfeng.yun@mediatek.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c
index 6464dcb..96a0b1e 100644 (file)
--- a/drivers/phy/phy-core.c
+++ b/drivers/phy/phy-core.c
@@ -11,6 +11,7 @@
 #include <linux/export.h>
 #include <linux/module.h>
 #include <linux/err.h>
+#include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/slab.h>
 #include <linux/of.h>
@@ -20,6 +21,7 @@
 #include <linux/regulator/consumer.h>
 
 static struct class *phy_class;
+static struct dentry *phy_debugfs_root;
 static DEFINE_MUTEX(phy_provider_mutex);
 static LIST_HEAD(phy_provider_list);
 static LIST_HEAD(phys);
@@ -996,6 +998,8 @@ struct phy *phy_create(struct device *dev, struct device_node *node,
                pm_runtime_no_callbacks(&phy->dev);
        }
 
+       phy->debugfs = debugfs_create_dir(dev_name(&phy->dev), phy_debugfs_root);
+
        return phy;
 
 put_dev:
@@ -1226,6 +1230,7 @@ static void phy_release(struct device *dev)
 
        phy = to_phy(dev);
        dev_vdbg(dev, "releasing '%s'\n", dev_name(dev));
+       debugfs_remove_recursive(phy->debugfs);
        regulator_put(phy->pwr);
        ida_simple_remove(&phy_ida, phy->id);
        kfree(phy);
@@ -1242,6 +1247,15 @@ static int __init phy_core_init(void)
 
        phy_class->dev_release = phy_release;
 
+       phy_debugfs_root = debugfs_create_dir("phy", NULL);
+
        return 0;
 }
 device_initcall(phy_core_init);
+
+static void __exit phy_core_exit(void)
+{
+       debugfs_remove_recursive(phy_debugfs_root);
+       class_destroy(phy_class);
+}
+module_exit(phy_core_exit);

diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h
index 3a570bc..f6d607e 100644 (file)
--- a/include/linux/phy/phy.h
+++ b/include/linux/phy/phy.h
@@ -148,6 +148,7 @@ struct phy_attrs {
  * @power_count: used to protect when the PHY is used by multiple consumers
  * @attrs: used to specify PHY specific attributes
  * @pwr: power regulator associated with the phy
+ * @debugfs: debugfs directory
  */
 struct phy {
        struct device           dev;
@@ -158,6 +159,7 @@ struct phy {
        int                     power_count;
        struct phy_attrs        attrs;
        struct regulator        *pwr;
+       struct dentry           *debugfs;
 };
 
 /**