From 32948d8b864c2a30cbd68c19c3400db7bdc1fbd4 Mon Sep 17 00:00:00 2001
From: Finley Xiao <finley.xiao@rock-chips.com>
Date: Wed, 16 Oct 2019 14:46:03 +0800
Subject: [PATCH] PM / devfreq: Add new device link for sysfs

As the device name has been changed to devfreq(X), but user should find
devfreq driver with their parent device name, so add a new link named
with parent name.

Change-Id: I5077ddecbcc8db8d59cb6f16f2be5107b391677d
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>
---
 drivers/devfreq/devfreq.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 504c28d18636..af7c8c30add6 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -27,6 +27,9 @@
 #include <linux/hrtimer.h>
 #include <linux/of.h>
 #include "governor.h"
+#ifdef CONFIG_ARCH_ROCKCHIP
+#include "../base/base.h"
+#endif
 
 static struct class *devfreq_class;
 
@@ -634,6 +637,18 @@ struct devfreq *devfreq_add_device(struct device *dev,
 		goto err_out;
 	}
 
+#ifdef CONFIG_ARCH_ROCKCHIP
+	if (sysfs_create_link(&devfreq->dev.class->p->subsys.kobj,
+			      &devfreq->dev.kobj, dev_name(dev))) {
+		dev_err(dev, "failed to create devfreq %s link\n",
+			dev_name(dev));
+		device_unregister(&devfreq->dev);
+		mutex_unlock(&devfreq->lock);
+		put_device(&devfreq->dev);
+		goto err_out;
+	}
+#endif
+
 	devfreq->trans_table =
 		devm_kzalloc(&devfreq->dev,
 			     array3_size(sizeof(unsigned int),
@@ -699,6 +714,11 @@ int devfreq_remove_device(struct devfreq *devfreq)
 	if (!devfreq)
 		return -EINVAL;
 
+#ifdef CONFIG_ARCH_ROCKCHIP
+	sysfs_delete_link(&devfreq->dev.class->p->subsys.kobj,
+			  &devfreq->dev.kobj, dev_name(devfreq->dev.parent));
+#endif
+
 	device_unregister(&devfreq->dev);
 
 	return 0;