Add device tree binding documentation for MAX2175 Rf to bits tuner
device.

Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasunda...@bp.renesas.com>
---
 .../devicetree/bindings/media/i2c/max2175.txt      | 61 ++++++++++++++++++++++
 .../devicetree/bindings/property-units.txt         |  1 +
 2 files changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/max2175.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/max2175.txt 
b/Documentation/devicetree/bindings/media/i2c/max2175.txt
new file mode 100644
index 0000000..f591ab4
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/max2175.txt
@@ -0,0 +1,61 @@
+Maxim Integrated MAX2175 RF to Bits tuner
+-----------------------------------------
+
+The MAX2175 IC is an advanced analog/digital hybrid-radio receiver with
+RF to BitsĀ® front-end designed for software-defined radio solutions.
+
+Required properties:
+--------------------
+- compatible: "maxim,max2175" for MAX2175 RF-to-bits tuner.
+- clocks: phandle to the fixed xtal clock.
+- clock-names: name of the fixed xtal clock.
+- port: child port node of a tuner that defines the local and remote
+  endpoints. The remote endpoint is assumed to be an SDR device
+  that is capable of receiving the digital samples from the tuner.
+
+Optional properties:
+--------------------
+- maxim,slave        : phandle to the master tuner if it is a slave. This
+                       is used to define two tuners in diversity mode
+                       (1 master, 1 slave). By default each tuner is an
+                       individual master.
+- maxim,refout-load-pF: load capacitance value (in pF) on reference
+                       output drive level. The possible load values are
+                        0 (default - refout disabled)
+                       10
+                       20
+                       30
+                       40
+                       60
+                       70
+- maxim,am-hiz       : empty property indicates AM Hi-Z filter path is
+                       selected for AM antenna input. By default this
+                       filter path is not used.
+
+Example:
+--------
+
+Board specific DTS file
+
+/* Fixed XTAL clock node */
+maxim_xtal: clock {
+       compatible = "fixed-clock";
+       #clock-cells = <0>;
+       clock-frequency = <36864000>;
+};
+
+/* A tuner device instance under i2c bus */
+max2175_0: tuner@60 {
+       compatible = "maxim,max2175";
+       reg = <0x60>;
+       clocks = <&maxim_xtal>;
+       clock-names = "xtal";
+       maxim,refout-load-pF = <10>;
+
+       port {
+               max2175_0_ep: endpoint {
+                       remote-endpoint = <&slave_rx_device>;
+               };
+       };
+
+};
diff --git a/Documentation/devicetree/bindings/property-units.txt 
b/Documentation/devicetree/bindings/property-units.txt
index 12278d7..f1f1c22 100644
--- a/Documentation/devicetree/bindings/property-units.txt
+++ b/Documentation/devicetree/bindings/property-units.txt
@@ -28,6 +28,7 @@ Electricity
 -ohms          : Ohms
 -micro-ohms    : micro Ohms
 -microvolt     : micro volts
+-pF            : pico farads
 
 Temperature
 ----------------------------------------
-- 
1.9.1

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