nfc: st-nci: Add device tree documentation for spi phy

Add st-nci-spi phy devicetree documentation

Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/Documentation/devicetree/bindings/net/nfc/st-nci.txt b/Documentation/devicetree/bindings/net/nfc/st-nci-i2c.txt
similarity index 100%
rename from Documentation/devicetree/bindings/net/nfc/st-nci.txt
rename to Documentation/devicetree/bindings/net/nfc/st-nci-i2c.txt

diff --git a/Documentation/devicetree/bindings/net/nfc/st-nci-spi.txt b/Documentation/devicetree/bindings/net/nfc/st-nci-spi.txt
new file mode 100644 (file)
index 0000000..525681b
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/nfc/st-nci-spi.txt
@@ -0,0 +1,31 @@
+* STMicroelectronics SAS. ST NCI NFC Controller
+
+Required properties:
+- compatible: Should be "st,st21nfcb-spi"
+- spi-max-frequency: Maximum SPI frequency (<= 10000000).
+- interrupt-parent: phandle for the interrupt gpio controller
+- interrupts: GPIO interrupt to which the chip is connected
+- reset-gpios: Output GPIO pin used to reset the ST21NFCB
+
+Optional SoC Specific Properties:
+- pinctrl-names: Contains only one value - "default".
+- pintctrl-0: Specifies the pin control groups used for this controller.
+
+Example (for ARM-based BeagleBoard xM with ST21NFCB on SPI4):
+
+&mcspi4 {
+
+       status = "okay";
+
+       st21nfcb: st21nfcb@0 {
+
+               compatible = "st,st21nfcb-spi";
+
+               clock-frequency = <4000000>;
+
+               interrupt-parent = <&gpio5>;
+               interrupts = <2 IRQ_TYPE_EDGE_RISING>;
+
+               reset-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>;
+       };
+};