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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. - 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: Example:
hsusb1_phy { hsusb1_phy {
@ -26,8 +31,11 @@ Example:
clock-names = "main_clk"; clock-names = "main_clk";
vcc-supply = <&hsusb1_vcc_regulator>; vcc-supply = <&hsusb1_vcc_regulator>;
reset-gpios = <&gpio1 7 GPIO_ACTIVE_LOW>; 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 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. 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. hsusb1_vcc_regulator provides power to the PHY and GPIO 7 controls RESET.
GPIO 13 detects VBus insertion, and accordingly notifies the vbus-regulator.