Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / usb / usb3503.txt

diff --git a/kernel/Documentation/devicetree/bindings/usb/usb3503.txt b/kernel/Documentation/devicetree/bindings/usb/usb3503.txt
new file mode 100644 (file)
index 0000000..52493b1
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/usb/usb3503.txt
@@ -0,0 +1,36 @@
+SMSC USB3503 High-Speed Hub Controller
+
+Required properties:
+- compatible: Should be "smsc,usb3503" or "smsc,usb3503a".
+
+Optional properties:
+- reg: Specifies the i2c slave address, it is required and should be 0x08
+       if I2C is used.
+- connect-gpios: Should specify GPIO for connect.
+- disabled-ports: Should specify the ports unused.
+       '1' or '2' or '3' are available for this property to describe the port
+       number. 1~3 property values are possible to be described.
+       Do not describe this property if all ports have to be enabled.
+- intn-gpios: Should specify GPIO for interrupt.
+- reset-gpios: Should specify GPIO for reset.
+- initial-mode: Should specify initial mode.
+                (1 for HUB mode, 2 for STANDBY mode)
+- refclk: Clock used for driving REFCLK signal (optional, if not provided
+       the driver assumes that clock signal is always available, its
+       rate is specified by REF_SEL pins and a value from the primary
+       reference clock frequencies table is used)
+- refclk-frequency: Frequency of the REFCLK signal as defined by REF_SEL
+       pins (optional, if not provided, driver will not set rate of the
+       REFCLK signal and assume that a value from the primary reference
+       clock frequencies table is used)
+
+Examples:
+       usb3503@08 {
+               compatible = "smsc,usb3503";
+               reg = <0x08>;
+               connect-gpios = <&gpx3 0 1>;
+               disabled-ports = <2 3>;
+               intn-gpios = <&gpx3 4 1>;
+               reset-gpios = <&gpx3 5 1>;
+               initial-mode = <1>;
+       };