usb: dwc3: drd: Add support for DR detection through extcon (268784ba) · Commits · 戴 / test

Allow extcon device, found by name, to provide DR status for USB. This is needed, for example, in case of Intel Merrifield platform, where the Intel Basin Cove PMIC provides an extcon device to communicate the detected role. Note, that the "linux,extcon-name" property name is only for kernel internal use by X86/ACPI platform code and as such is not documented in the device tree bindings. Signed-off-by:

Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:

Felipe Balbi <felipe.balbi@linux.intel.com>

drivers/usb/dwc3/drd.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -446,10 +446,20 @@ static struct extcon_dev dwc3_get_extcon(struct dwc3 dwc)
		struct device *dev = dwc->dev;
		struct device_node np_phy, np_conn;
		struct extcon_dev *edev;
		const char *name;

		if (device_property_read_bool(dev, "extcon"))
		return extcon_get_edev_by_phandle(dev, 0);

		/*
		* Device tree platforms should get extcon via phandle.
		* On ACPI platforms, we get the name from a device property.
		* This device property is for kernel internal use only and
		* is expected to be set by the glue code.
		*/
		if (device_property_read_string(dev, "linux,extcon-name", &name) == 0)
		return extcon_get_extcon_dev(name);

		np_phy = of_parse_phandle(dev->of_node, "phys", 0);
		np_conn = of_graph_get_remote_node(np_phy, -1, -1);

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