diff mbox series

[v2,3/3] usb: dwc3: drd: Add support for DR detection through extcon

Message ID 20181115131621.44187-3-andriy.shevchenko@linux.intel.com (mailing list archive)
State New, archived
Headers show
Series [v2,1/3] staging: typec: fusb302: Rename fcs,extcon-name to linux,extcon-name | expand

Commit Message

Andy Shevchenko Nov. 15, 2018, 1:16 p.m. UTC 
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>
Acked-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/usb/dwc3/drd.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)
diff mbox series

Patch

diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c
index 2401bd504891..726100d1ac0d 100644
--- a/drivers/usb/dwc3/drd.c
+++ b/drivers/usb/dwc3/drd.c
@@ -446,10 +446,25 @@  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) {
+		edev = extcon_get_extcon_dev(name);
+		if (!edev)
+			return ERR_PTR(-EPROBE_DEFER);
+
+		return edev;
+	}
+
 	np_phy = of_parse_phandle(dev->of_node, "phys", 0);
 	np_conn = of_graph_get_remote_node(np_phy, -1, -1);