[media] dt-bindings: media: Add MAX2175 binding description

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

Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@bp.renesas.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/Documentation/devicetree/bindings/media/i2c/max2175.txt b/Documentation/devicetree/bindings/media/i2c/max2175.txt
new file mode 100644 (file)
index 0000000..02b4e9c
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/max2175.txt
@@ -0,0 +1,59 @@
+Maxim Integrated MAX2175 RF to Bits tuner
+-----------------------------------------
+
+The MAX2175 IC is an advanced analog/digital hybrid-radio receiver with
+RF to Bits® front-end designed for software-defined radio solutions.
+
+Required properties:
+--------------------
+- compatible: "maxim,max2175" for MAX2175 RF-to-bits tuner.
+- clocks: clock specifier.
+- port: child port node corresponding to the I2S output, in accordance with
+       the video interface bindings defined in
+       Documentation/devicetree/bindings/media/video-interfaces.txt. The port
+       node must contain at least one endpoint.
+
+Optional properties:
+--------------------
+- maxim,master       : 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   : load capacitance value (in picofarads) on reference
+                       output drive level. The possible load values are:
+                        0 (default - refout disabled)
+                       10
+                       20
+                       30
+                       40
+                       60
+                       70
+- maxim,am-hiz-filter : empty property indicates the AM Hi-Z filter is used
+                       in this hardware for AM antenna input.
+
+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>;
+       maxim,refout-load = <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..7c9f6ee 100644 (file)
--- 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
+-picofarads    : picofarads
 
 Temperature
 ----------------------------------------