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Bluetooth: btusb: Add out-of-band wakeup support

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Some onboard BT chips (e.g. Marvell 8997) contain a wakeup pin that
can be connected to a gpio on the CPU side, and can be used to wakeup
the host out-of-band. This can be useful in situations where the
in-band wakeup is not possible or not preferable (e.g. the in-band
wakeup may require the USB host controller to remain active, and
hence consuming more system power during system sleep).

The oob gpio interrupt to be used for wakeup on the CPU side, is
read from the device tree node, (using standard interrupt descriptors).
A devcie tree binding document is also added for the driver. The
compatible string is in compliance with
Documentation/devicetree/bindings/usb/usb-device.txt

Signed-off-by: Rajat Jain <[email protected]>
Reviewed-by: Brian Norris <[email protected]>
Acked-by: Rob Herring <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>
This commit is contained in:
Rajat Jain 2017-02-01 14:24:09 -08:00 • committed by Marcel Holtmann
commit fd913ef7ce
2 changed files with 125 additions and 0 deletions
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40
Documentation/devicetree/bindings/net/btusb.txt Normal file
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Generic Bluetooth controller over USB (btusb driver)
---------------------------------------------------
Required properties:
- compatible : should comply with the format "usbVID,PID" specified in
Documentation/devicetree/bindings/usb/usb-device.txt
At the time of writing, the only OF supported devices
(more may be added later) are:
"usb1286,204e" (Marvell 8997)
Optional properties:
- interrupt-parent: phandle of the parent interrupt controller
- interrupt-names: (see below)
- interrupts : The interrupt specified by the name "wakeup" is the interrupt
that shall be used for out-of-band wake-on-bt. Driver will
request this interrupt for wakeup. During system suspend, the
irq will be enabled so that the bluetooth chip can wakeup host
platform out of band. During system resume, the irq will be
disabled to make sure unnecessary interrupt is not received.
Example:
Following example uses irq pin number 3 of gpio0 for out of band wake-on-bt:
&usb_host1_ehci {
status = "okay";
#address-cells = <1>;
#size-cells = <0>;
mvl_bt1: bt@1 {
compatible = "usb1286,204e";
reg = <1>;
interrupt-parent = <&gpio0>;
interrupt-name = "wakeup";
interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
};
};