usb: chipidea: debug: remove redundant 'role' debug file

Two 'role' file exist in different position but with totally same function.

1. /sys/devices/platform/soc@0/xxxxxxxx.usb/ci_hdrc.0/role
2. /sys/kernel/debug/usb/ci_hdrc.0/role

This will remove the 2rd redundant 'role' debug file (under debugfs) and
keep the one which is more closer to user.

Acked-by: Peter Chen <[e-mail]>
Signed-off-by: Xu Yang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/usb/chipidea/debug.c

···
 }
 DEFINE_SHOW_ATTRIBUTE(ci_otg);
 
-static int ci_role_show(struct seq_file *s, void *data)
-{
-	struct ci_hdrc *ci = s->private;
-
-	if (ci->role != CI_ROLE_END)
-		seq_printf(s, "%s\n", ci_role(ci)->name);
-
-	return 0;
-}
-
-static ssize_t ci_role_write(struct file *file, const char __user *ubuf,
-			     size_t count, loff_t *ppos)
-{
-	struct seq_file *s = file->private_data;
-	struct ci_hdrc *ci = s->private;
-	enum ci_role role;
-	char buf[8];
-	int ret;
-
-	if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
-		return -EFAULT;
-
-	for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
-		if (ci->roles[role] &&
-		    !strncmp(buf, ci->roles[role]->name,
-			     strlen(ci->roles[role]->name)))
-			break;
-
-	if (role == CI_ROLE_END || role == ci->role)
-		return -EINVAL;
-
-	pm_runtime_get_sync(ci->dev);
-	disable_irq(ci->irq);
-	ci_role_stop(ci);
-	ret = ci_role_start(ci, role);
-	enable_irq(ci->irq);
-	pm_runtime_put_sync(ci->dev);
-
-	return ret ? ret : count;
-}
-
-static int ci_role_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, ci_role_show, inode->i_private);
-}
-
-static const struct file_operations ci_role_fops = {
-	.open		= ci_role_open,
-	.write		= ci_role_write,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
-
 static int ci_registers_show(struct seq_file *s, void *unused)
 {
 	struct ci_hdrc *ci = s->private;
···
 	if (ci_otg_is_fsm_mode(ci))
 		debugfs_create_file("otg", S_IRUGO, dir, ci, &ci_otg_fops);
 
-	debugfs_create_file("role", S_IRUGO | S_IWUSR, dir, ci, &ci_role_fops);
 	debugfs_create_file("registers", S_IRUGO, dir, ci, &ci_registers_fops);
 }