DT: bindings: net: nfc: Add ST95HF binding doc

This patch includes ST95HF binding doc that guides how to
make node entry of ST95HF in DT file of any platform.

Signed-off-by: Shikha Singh <shikha.singh@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/Documentation/devicetree/bindings/net/nfc/st95hf.txt b/Documentation/devicetree/bindings/net/nfc/st95hf.txt
new file mode 100644 (file)
index 0000000..ea3178b
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/nfc/st95hf.txt
@@ -0,0 +1,50 @@
+* STMicroelectronics : NFC Transceiver ST95HF
+
+ST NFC Transceiver is required to attach with SPI bus.
+ST95HF node should be defined in DT as SPI slave device of SPI
+master with which ST95HF transceiver is physically connected.
+The properties defined below are required to be the part of DT
+to include ST95HF transceiver into the platform.
+
+Required properties:
+===================
+- reg: Address of SPI slave "ST95HF transceiver" on SPI master bus.
+
+- compatible: should be "st,st95hf" for ST95HF NFC transceiver
+
+- spi-max-frequency: Max. operating SPI frequency for ST95HF
+       transceiver.
+
+- enable-gpio: GPIO line to enable ST95HF transceiver.
+
+- interrupt-parent : Standard way to specify the controller to which
+       ST95HF transceiver's interrupt is routed.
+
+- interrupts : Standard way to define ST95HF transceiver's out
+       interrupt.
+
+Optional property:
+=================
+- st95hfvin-supply : This is an optional property. It contains a
+       phandle to ST95HF transceiver's regulator supply node in DT.
+
+Example:
+=======
+spi@9840000 {
+       reg = <0x9840000 0x110>;
+       #address-cells = <1>;
+       #size-cells = <0>;
+       cs-gpios = <&pio0 4>;
+       status = "okay";
+
+       st95hf@0{
+               reg = <0>;
+               compatible = "st,st95hf";
+               status = "okay";
+               spi-max-frequency = <1000000>;
+               enable-gpio = <&pio4 0>;
+               interrupt-parent = <&pio0>;
+               interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+       };
+
+};