From f0e4cfe9f7477d7203a138cf50bf3efd610e870d Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Sat, 10 Nov 2018 20:11:01 +0200 Subject: [PATCH] UPSTREAM: usb: dwc3: drd: Add support for DR detection through extcon 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. Change-Id: Idfd5fb48b8ef196ba670fb61880fb2a999b538e8 Signed-off-by: Andy Shevchenko Signed-off-by: Felipe Balbi Signed-off-by: William Wu (cherry picked from commit 268784ba14a7bff23bc80531d6db31986eafd54b) --- drivers/usb/dwc3/drd.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/usb/dwc3/drd.c b/drivers/usb/dwc3/drd.c index 2401bd504891..869725d15c74 100644 --- a/drivers/usb/dwc3/drd.c +++ b/drivers/usb/dwc3/drd.c @@ -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);