[PATCH v7 1/3] usb: gadget: pxa27x_udc device-tree documentation

[Robert Jarzmik <robert.jarzmik-GANU6spQydw@public.gmane.org>]

Add documentation for device-tree binding of arm PXA 27x udc (usb
device) driver.

Signed-off-by: Robert Jarzmik <robert.jarzmik-GANU6spQydw@public.gmane.org>
Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Acked-by: Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>

---
Since V1: change OF id mrvl,pxa27x_udc -> marvell,pxa27x-udc
          This is a consequence of other DT reviews on the marvell
          namings.
Since V2: Mark's review
          - described standard properties
          - use standard gpio bindings for pullup gpio
Since V3: Arnd's review
          - removed clock-names
---
 Documentation/devicetree/bindings/usb/pxa-usb.txt | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/pxa-usb.txt b/Documentation/devicetree/bindings/usb/pxa-usb.txt
index 79729a9..9c33179 100644
--- a/Documentation/devicetree/bindings/usb/pxa-usb.txt
+++ b/Documentation/devicetree/bindings/usb/pxa-usb.txt
@@ -29,3 +29,25 @@ Example:
 		marvell,port-mode = <2>; /* PMM_GLOBAL_MODE */
 	};
 
+UDC
+
+Required properties:
+ - compatible: Should be "marvell,pxa270-udc" for USB controllers
+   used in device mode.
+ - reg: usb device MMIO address space
+ - interrupts: single interrupt generated by the UDC IP
+ - clocks: input clock of the UDC IP (see clock-bindings.txt)
+
+Optional properties:
+ - gpios:
+   - gpio activated to control the USB D+ pullup (see gpio.txt)
+
+Example:
+
+		pxa27x_udc: udc@40600000 {
+			compatible = "marvell,pxa270-udc";
+			reg = <0x40600000 0x10000>;
+			interrupts = <11>;
+			clocks = <&pxa2xx_clks 11>;
+			gpios = <&gpio 22 GPIO_ACTIVE_LOW>;
+		};
-- 
2.1.0

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