Hi Neil,
> > +static int dwc3_meson_g12a_debugfs_init(struct dwc3_meson_g12a *priv)
> > +{
> > + priv->root = debugfs_create_dir("dwc3-meson-g12a", NULL);
> > + if (IS_ERR(priv->root))
> > + return PTR_ERR(priv->root);
> > +
> > + debugfs_create_file("mode_force", 0600, priv->root, priv,
> > + &dwc3_meson_g12a_mode_force_fops);
> > +
> > + debugfs_create_file("otg_id", 0400, priv->root, priv,
> > + &dwc3_meson_g12a_otg_id_fops);
> > +
> > + return 0;
> > +}
I just stumbled across the "USB role switch framework", see [0]
it seems to provide a userspace API as well and two in-kernel drivers
are using this framework already
(drivers/usb/gadget/udc/renesas_usb3.c,
drivers/usb/roles/intel-xhci-usb-role-switch.c)
[0] https://elixir.bootlin.com/linux/v5.0-rc8/source/drivers/usb/roles/class.c#L246
