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

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Date:   Fri, 9 Apr 2021 14:30:27 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.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>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH RESEND v8 6/7] usb: dwc3: qcom: Detect DWC3 DT-nodes using compatible string

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.

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