NFC: trf7970a: Add DTS Documentation

Describe the properies used by the trf7970a
RFID/NFC/15693 transceiver driver.

Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/Documentation/devicetree/bindings/net/nfc/trf7970a.txt b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt
new file mode 100644 (file)
index 0000000..8dd3ef7
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/nfc/trf7970a.txt
@@ -0,0 +1,34 @@
+* Texas Instruments TRF7970A RFID/NFC/15693 Transceiver
+
+Required properties:
+- compatible: Should be "ti,trf7970a".
+- spi-max-frequency: Maximum SPI frequency (<= 2000000).
+- interrupt-parent: phandle of parent interrupt handler.
+- interrupts: A single interrupt specifier.
+- ti,enable-gpios: Two GPIO entries used for 'EN' and 'EN2' pins on the
+  TRF7970A.
+- vin-supply: Regulator for supply voltage to VIN pin
+
+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 BeagleBone with TRF7970A on SPI1):
+
+&spi1 {
+       status = "okay";
+
+       nfc@0 {
+               compatible = "ti,trf7970a";
+               reg = <0>;
+               pinctrl-names = "default";
+               pinctrl-0 = <&trf7970a_default>;
+               spi-max-frequency = <2000000>;
+               interrupt-parent = <&gpio2>;
+               interrupts = <14 0>;
+               ti,enable-gpios = <&gpio2 2 GPIO_ACTIVE_LOW>,
+                                 <&gpio2 5 GPIO_ACTIVE_LOW>;
+               vin-supply = <&ldo3_reg>;
+               status = "okay";
+       };
+};

diff --git a/MAINTAINERS b/MAINTAINERS
index b2cf5cfb4d29de3dc27e351ba090134bfd624de6..ec12265ac67bdacd67ab5a6a062c50bf6c1356b5 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6067,6 +6067,7 @@ F:        include/net/nfc/
 F:     include/uapi/linux/nfc.h
 F:     drivers/nfc/
 F:     include/linux/platform_data/pn544.h
+F:     Documentation/devicetree/bindings/net/nfc/
 
 NFS, SUNRPC, AND LOCKD CLIENTS
 M:     Trond Myklebust <trond.myklebust@primarydata.com>