usb: host: ohci-st: Add ohci-st devicetree bindings documentation

This patch documents the device tree bindings required for
the ohci on-chip controller found in ST consumer electronics SoC's.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/usb/ohci-st.txt b/Documentation/devicetree/bindings/usb/ohci-st.txt
new file mode 100644 (file)
index 0000000..6d83937
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/ohci-st.txt
@@ -0,0 +1,37 @@
+ST USB OHCI controller
+
+Required properties:
+
+ - compatible          : must be "st,st-ohci-300x"
+ - reg                 : physical base addresses of the controller and length of memory mapped
+                         region
+ - interrupts          : one OHCI controller interrupt should be described here
+ - clocks              : phandle list of usb clocks
+ - clock-names         : should be "ic" for interconnect clock and "clk48"
+See: Documentation/devicetree/bindings/clock/clock-bindings.txt
+
+ - phys                        : phandle for the PHY device
+ - phy-names           : should be "usb"
+
+ - resets              : phandle to the powerdown and reset controller for the USB IP
+ - reset-names         : should be "power" and "softreset".
+See: Documentation/devicetree/bindings/reset/st,sti-powerdown.txt
+See: Documentation/devicetree/bindings/reset/reset.txt
+
+Example:
+
+       ohci0: usb@0xfe1ffc00 {
+               compatible = "st,st-ohci-300x";
+               reg = <0xfe1ffc00 0x100>;
+               interrupts = <GIC_SPI 149 IRQ_TYPE_NONE>;
+               clocks = <&clk_s_a1_ls 0>,
+                        <&clockgen_b0 0>;
+               clock-names = "ic", "clk48";
+               phys = <&usb2_phy>;
+               phy-names = "usb";
+               status = "okay";
+
+               resets = <&powerdown STIH416_USB0_POWERDOWN>,
+                        <&softreset STIH416_USB0_SOFTRESET>;
+               reset-names = "power", "softreset";
+       };