linux-kernel - Re: [PATCH v6 09/10] usb: dwc3: qcom: Detect DWC3 DT-nodes with "usb"-prefixed names

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Date:   Wed, 10 Feb 2021 12:17:27 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Gross <agross@...nel.org>,
        Linux USB List <linux-usb@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 09/10] usb: dwc3: qcom: Detect DWC3 DT-nodes with
 "usb"-prefixed names

On Wed, Feb 10, 2021 at 11:29 AM Serge Semin
<Sergey.Semin@...kalelectronics.ru> wrote:
>
> In accordance with the USB HCD/DRD schema all the USB controllers are
> supposed to have DT-nodes named with prefix "^usb(@.*)?".  Since the
> existing DT-nodes will be renamed in a subsequent patch let's first make
> sure the DWC3 Qualcomm driver supports them and second falls back to the
> deprecated naming so not to fail on the legacy DTS-files passed to the
> newer kernels.
>
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index c703d552bbcf..49ad8d507d37 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -630,7 +630,8 @@ static int dwc3_qcom_of_register_core(struct platform_device *pdev)
>         struct device           *dev = &pdev->dev;
>         int                     ret;
>
> -       dwc3_np = of_get_child_by_name(np, "dwc3");
> +       dwc3_np = of_get_child_by_name(np, "usb") ?:
> +                 of_get_child_by_name(np, "dwc3");

Is there some reason using compatible instead wouldn't work here?

Rob