phy: phy-stih41x-usb: Add dt documentation for USB phy on STiH415/6

This patch adds dt documentation bindings for the usb phy found
on STiH415/5 SoC's from STMicroelectronics, which support USB 1.1 and 2.0.

Signed-off-by: Maxime Coquelin <maxime.coquelin@st.com>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>

diff --git a/Documentation/devicetree/bindings/phy/phy-stih41x-usb.txt b/Documentation/devicetree/bindings/phy/phy-stih41x-usb.txt
new file mode 100644 (file)
index 0000000..00944a0
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/phy-stih41x-usb.txt
@@ -0,0 +1,24 @@
+STMicroelectronics STiH41x USB PHY binding
+------------------------------------------
+
+This file contains documentation for the usb phy found in STiH415/6 SoCs from
+STMicroelectronics.
+
+Required properties:
+- compatible   : should be "st,stih416-usb-phy" or "st,stih415-usb-phy"
+- st,syscfg    : should be a phandle of the syscfg node
+- clock-names  : must contain "osc_phy"
+- clocks       : must contain an entry for each name in clock-names.
+See: Documentation/devicetree/bindings/clock/clock-bindings.txt
+- #phy-cells   : must be 0 for this phy
+See: Documentation/devicetree/bindings/phy/phy-bindings.txt
+
+Example:
+
+usb2_phy: usb2phy@0 {
+       compatible      = "st,stih416-usb-phy";
+       #phy-cell       = <0>;
+       st,syscfg       = <&syscfg_rear>;
+       clocks          = <&clk_sysin>;
+       clock-names     = "osc_phy";
+};