[PATCH v6 1/4] usb: dwc3: of-simple: bail probe if no dwc3 child node

From: Johan Jonker <jbx6244@gmail.com>
To: heiko@sntech.de
Cc: robh+dt@kernel.org, gregkh@linuxfoundation.org, balbi@kernel.org,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-usb@vger.kernel.org
Subject: [PATCH v6 1/4] usb: dwc3: of-simple: bail probe if no dwc3 child node
Date: Thu,  1 Apr 2021 23:36:49 +0200	[thread overview]
Message-ID: <20210401213652.14676-2-jbx6244@gmail.com> (raw)
In-Reply-To: <20210401213652.14676-1-jbx6244@gmail.com>

For some of the dwc3-of-simple compatible SoCs we
don't want to bind this driver to a dwc3 node,
but bind that node to the 'snps,dwc3' driver instead.
The kernel has no logic to decide which driver to bind
to if there are 2 matching drivers, so bail probe if no
dwc3 child node.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
---
 drivers/usb/dwc3/dwc3-of-simple.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-of-simple.c b/drivers/usb/dwc3/dwc3-of-simple.c
index 71fd620c5..8d3baa5df 100644
--- a/drivers/usb/dwc3/dwc3-of-simple.c
+++ b/drivers/usb/dwc3/dwc3-of-simple.c
@@ -38,6 +38,10 @@ static int dwc3_of_simple_probe(struct platform_device *pdev)
 
 	int			ret;
 
+	/* Bail probe if no dwc3 child node. */
+	if (!of_get_compatible_child(dev->of_node, "snps,dwc3"))
+		return -ENODEV;
+
 	simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
 	if (!simple)
 		return -ENOMEM;
-- 
2.11.0

