usb: dwc2: Show dr_mode via debugfs

Show the value of dr_mode via a debufs file.

Signed-off-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/usb/dwc2/debugfs.c b/drivers/usb/dwc2/debugfs.c
index 57747b0df595..794b959a7c8c 100644
--- a/drivers/usb/dwc2/debugfs.c
+++ b/drivers/usb/dwc2/debugfs.c
@@ -839,6 +839,29 @@ static const struct file_operations hw_params_fops = {
         .release        = single_release,
 };
 
+static int dr_mode_show(struct seq_file *seq, void *v)
+{
+        struct dwc2_hsotg *hsotg = seq->private;
+        const char *dr_mode = "";
+
+        device_property_read_string(hsotg->dev, "dr_mode", &dr_mode);
+        seq_printf(seq, "%s\n", dr_mode);
+        return 0;
+}
+
+static int dr_mode_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, dr_mode_show, inode->i_private);
+}
+
+static const struct file_operations dr_mode_fops = {
+        .owner          = THIS_MODULE,
+        .open           = dr_mode_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
 int dwc2_debugfs_init(struct dwc2_hsotg *hsotg)
 {
         int                     ret;
@@ -863,6 +886,12 @@ int dwc2_debugfs_init(struct dwc2_hsotg *hsotg)
                 dev_err(hsotg->dev, "%s: failed to create hw_params\n",
                         __func__);
 
+        file = debugfs_create_file("dr_mode", 0444,
+                                   hsotg->debug_root,
+                                   hsotg, &dr_mode_fops);
+        if (IS_ERR(file))
+                dev_err(hsotg->dev, "%s: failed to create dr_mode\n", __func__);
+
         /* Add gadget debugfs nodes */
         dwc2_hsotg_create_debug(hsotg);