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authorAndy Shevchenko2018-11-10 20:11:01 +0200
committerFelipe Balbi2018-11-26 09:06:32 +0200
commit268784ba14a7bff23bc80531d6db31986eafd54b (patch)
tree022b0d9e36f7c5e2aab1351cb5575b604a831e89 /drivers/usb/dwc3
parent85383756ae34db2ee46daa779f869598a3443651 (diff)
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. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/dwc3')
-rw-r--r--drivers/usb/dwc3/drd.c10
1 files changed, 10 insertions, 0 deletions
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);