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UPSTREAM: usb: dwc3: drd: Add support for DR detection through extcon

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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 <andriy.shevchenko@linux.intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: William Wu <william.wu@rock-chips.com>
(cherry picked from commit 268784ba14)
This commit is contained in:
Andy Shevchenko
2018-11-10 20:11:01 +02:00
committed by Tao Huang
parent 32686cf9d3
commit f0e4cfe9f7
1 changed files with 10 additions and 0 deletions
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10
drivers/usb/dwc3/drd.c
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@@ -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);