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kernel_samsung_sm7125/Documentation/devicetree/bindings/net/btusb.txt

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Bluetooth: btusb: Add out-of-band wakeup support 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 <rajatja@google.com> Reviewed-by: Brian Norris <briannorris@chromium.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
8 years ago
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)
Bluetooth: btusb: Configure Marvell to use one of the pins for oob wakeup The Marvell devices may have many gpio pins, and hence for wakeup on these out-of-band pins, the chip needs to be told which pin is to be used for wakeup, using an hci command. Thus, we read the pin number etc from the device tree node and send a command to the chip. Signed-off-by: Rajat Jain <rajatja@google.com> Reviewed-by: Brian Norris <briannorris@chromium.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
8 years ago
Also, vendors that use btusb may have device additional properties, e.g:
Documentation/devicetree/bindings/net/marvell-bt-8xxx.txt
Bluetooth: btusb: Add out-of-band wakeup support 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 <rajatja@google.com> Reviewed-by: Brian Norris <briannorris@chromium.org> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
8 years ago
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>;
};
};