linux-kernel - Re: [PATCH v3 1/2] usb: dwc3: drd: Avoid error when extcon is missing

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Date:   Sun, 13 Dec 2020 13:26:25 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Sam Protsenko <semen.protsenko@...aro.org>
Cc:     USB <linux-usb@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        John Stultz <john.stultz@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v3 1/2] usb: dwc3: drd: Avoid error when extcon is missing

On Sun, Dec 13, 2020 at 5:22 AM Sam Protsenko
<semen.protsenko@...aro.org> 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

devices

> "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@...4abcd
>
> Avoid printing that message by checking if port node exists in PHY node

if the port

> before calling of_graph_get_remote_node().

Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
> Changes in v3:
>   - Split patch into two patches: logic diff and style diff
>
>  drivers/usb/dwc3/drd.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
> index 3e1c1aacf002..312a4d060e80 100644
> --- a/drivers/usb/dwc3/drd.c
> +++ b/drivers/usb/dwc3/drd.c
> @@ -463,7 +463,10 @@ static struct extcon_dev *dwc3_get_extcon(struct dwc3 *dwc)
>         }
>
>         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))
> +               np_conn = of_graph_get_remote_node(np_phy, -1, -1);
> +       else
> +               np_conn = NULL;
>
>         if (np_conn)
>                 edev = extcon_find_edev_by_node(np_conn);
> --
> 2.29.2
>


-- 
With Best Regards,
Andy Shevchenko