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usb: phy: nop: device tree documentation for vbus 

Enhance the phy documentation by adding 2 new optional bindings :
 - the vbus gpio, which detects usb insertion
 - the vbus regulator, which provides current drawn from the usb cable

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Robert Jarzmik 2014-12-06 22:05:14 +01:00 committed by Felipe Balbi
parent e9f2cefb0c
commit 7bdea87a87
1 changed files with 8 additions and 0 deletions
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8
Documentation/devicetree/bindings/usb/usb-nop-xceiv.txt
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@ -17,6 +17,11 @@ Optional properties:
- reset-gpios: Should specify the GPIO for reset.
- vbus-detect-gpio: should specify the GPIO detecting a VBus insertion
(see Documentation/devicetree/bindings/gpio/gpio.txt)
- vbus-regulator : should specifiy the regulator supplying current drawn from
the VBus line (see Documentation/devicetree/bindings/regulator/regulator.txt).
Example:
hsusb1_phy {
@ -26,8 +31,11 @@ Example:
clock-names = "main_clk";
vcc-supply = <&hsusb1_vcc_regulator>;
reset-gpios = <&gpio1 7 GPIO_ACTIVE_LOW>;
vbus-detect-gpio = <&gpio2 13 GPIO_ACTIVE_HIGH>;
vbus-regulator = <&vbus_regulator>;
};
hsusb1_phy is a NOP USB PHY device that gets its clock from an oscillator
and expects that clock to be configured to 19.2MHz by the NOP PHY driver.
hsusb1_vcc_regulator provides power to the PHY and GPIO 7 controls RESET.
GPIO 13 detects VBus insertion, and accordingly notifies the vbus-regulator.