linux-kernel - Re: [PATCH RESEND v8 6/7] usb: dwc3: qcom: Detect DWC3 DT-nodes using compatible string

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Date:   Fri, 9 Apr 2021 09:05:39 -0500
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Andy Gross <agross@...nel.org>, Felipe Balbi <balbi@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Vladimir Zapolskiy <vz@...ia.com>,
        Alexey Brodkin <abrodkin@...opsys.com>,
        Vineet Gupta <vgupta@...opsys.com>,
        Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-usb@...r.kernel.org, Serge Semin <fancer.lancer@...il.com>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND v8 6/7] usb: dwc3: qcom: Detect DWC3 DT-nodes
 using compatible string

On Fri 09 Apr 06:30 CDT 2021, Serge Semin 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 fix the DWC3
> Qcom-specific code to detect the DWC3 sub-node just by checking its
> compatible string to match the "snps,dwc3". The semantic of the code
> won't change seeing all the DWC USB3 nodes are supposed to have the
> compatible property with any of those strings set.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> 
> ---
> 
> Changelog v7:
> - Replace "of_get_child_by_name(np, "usb") ?: of_get_child_by_name(np, "dwc3");"
>   pattern with using of_get_compatible_child() method.
> - Discard Bjorn Andersson Reviewed-by tag since the patch content
>   has been changed.
> ---
>  drivers/usb/dwc3/dwc3-qcom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
> index fcaf04483ad0..617a1be88371 100644
> --- a/drivers/usb/dwc3/dwc3-qcom.c
> +++ b/drivers/usb/dwc3/dwc3-qcom.c
> @@ -644,7 +644,7 @@ 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_compatible_child(np, "snps,dwc3");
>  	if (!dwc3_np) {
>  		dev_err(dev, "failed to find dwc3 core child\n");
>  		return -ENODEV;
> -- 
> 2.30.1
>