usb: dwc3: debugfs: convert our regdump to use regsets

regset is a generic implementation of regdump
utility through debugfs.
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/dwc3/core.h

@@ -723,6 +723,7 @@ struct dwc3 {
 
 	struct dwc3_hwparams	hwparams;
 	struct dentry		*root;
+	struct debugfs_regset32	*regset;
 
 	u8			test_mode;
 	u8			test_mode_nr;

drivers/usb/dwc3/debugfs.c

@@ -59,7 +59,7 @@
 	.offset	= DWC3_ ##nm - DWC3_GLOBALS_REGS_START,	\
 }
 
-static const struct debugfs_reg32 dwc3_regs[] = {
+static struct debugfs_reg32 dwc3_regs[] = {
 	dump_register(GSBUSCFG0),
 	dump_register(GSBUSCFG1),
 	dump_register(GTXTHRCFG),
@@ -376,27 +376,6 @@ static const struct debugfs_reg32 dwc3_regs[] = {
 	dump_register(OSTS),
 };
 
-static int dwc3_regdump_show(struct seq_file *s, void *unused)
-{
-	struct dwc3		*dwc = s->private;
-
-	seq_printf(s, "DesignWare USB3 Core Register Dump\n");
-	debugfs_print_regs32(s, dwc3_regs, ARRAY_SIZE(dwc3_regs),
-			     dwc->regs, "");
-	return 0;
-}
-
-static int dwc3_regdump_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, dwc3_regdump_show, inode->i_private);
-}
-
-static const struct file_operations dwc3_regdump_fops = {
-	.open			= dwc3_regdump_open,
-	.read			= seq_read,
-	.release		= single_release,
-};
-
 static int dwc3_mode_show(struct seq_file *s, void *unused)
 {
 	struct dwc3		*dwc = s->private;
@@ -666,8 +645,17 @@ int dwc3_debugfs_init(struct dwc3 *dwc)
 
 	dwc->root = root;
 
-	file = debugfs_create_file("regdump", S_IRUGO, root, dwc,
-			&dwc3_regdump_fops);
+	dwc->regset = kzalloc(sizeof(*dwc->regset), GFP_KERNEL);
+	if (!dwc->regset) {
+		ret = -ENOMEM;
+		goto err1;
+	}
+
+	dwc->regset->regs = dwc3_regs;
+	dwc->regset->nregs = ARRAY_SIZE(dwc3_regs);
+	dwc->regset->base = dwc->regs;
+
+	file = debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
 	if (!file) {
 		ret = -ENOMEM;
 		goto err1;