On Fri, 11 Dec 2020 at 16:48, Andy Shevchenko
<andriy.shevchenko@xxxxxxxxxxxxxxx> wrote:
>
> On Fri, Dec 11, 2020 at 04:24:21PM +0200, Sam Protsenko wrote:
> > If "port" node is missing in PHY controller node, dwc3_get_extcon()
> > isn't able to find extcon device. This is perfectly fine in case when
> > "usb-role-switch" or OTG is used, but next misleading error message is
> > printed in that case, from of_graph_get_remote_node():
> >
> > OF: graph: no port node found in /phy@1234abcd
> >
> > Avoid printing that message by checking if port node exists in PHY node
> > before calling of_graph_get_remote_node().
>
> So, this has to be v2...
> Anyway, see below.
>
> ...
>
> > static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
> > {
> > struct device *dev = dwc->dev;
> > - struct device_node *np_phy, *np_conn;
> > - struct extcon_dev *edev;
> > + struct device_node *np_phy;
> > + struct extcon_dev *edev = NULL;
> > const char *name;
> >
> > if (device_property_read_bool(dev, "extcon"))
> > @@ -462,15 +462,22 @@ static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
> > return edev;
> > }
> >
> > + /*
> > + * Try to get extcon device from USB PHY controller's "port" node.
> > + * Check if it has the "port" node first, to avoid printing the error
> > + * message from underlying code, as it's a valid case: extcon device
> > + * (and "port" node) may be missing in case of "usb-role-switch" or OTG
> > + * mode.
> > + */
> > np_phy = of_parse_phandle(dev->of_node, "phys", 0);
> > - np_conn = of_graph_get_remote_node(np_phy, -1, -1);
> > + if (of_graph_is_present(np_phy)) {
> > + struct device_node *np_conn;
> >
> > - if (np_conn)
> > - edev = extcon_find_edev_by_node(np_conn);
> > - else
> > - edev = NULL;
> > -
> > - of_node_put(np_conn);
> > + np_conn = of_graph_get_remote_node(np_phy, -1, -1);
> > + if (np_conn)
> > + edev = extcon_find_edev_by_node(np_conn);
> > + of_node_put(np_conn);
> > + }
> > of_node_put(np_phy);
> >
> > return edev;
>
>
> Why not do it slightly different, i.e.
>
> - np_conn = of_graph_get_remote_node(np_phy, -1, -1);
> + if (of_graph_is_present(np_phy))
> + np_conn = of_graph_get_remote_node(np_phy, -1, -1);
> + else
> + np_conn = NULL;
>
> ?
>
Thanks for the review, Andy! I'll address this in v3.
> --
> With Best Regards,
> Andy Shevchenko
>
>
