Hi Ramesh,
On Tue, May 09, 2017 at 02:37:33PM +0100, Ramesh Shanmugasundaram wrote:
> Add device tree binding documentation for MAX2175 RF to bits tuner
> device.
>
> Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram@xxxxxxxxxxxxxx>
> Acked-by: Rob Herring <robh@xxxxxxxxxx>
> ---
> v5:
> - pF in property-units.txt is renamed to pico-farads (Geert)
> - "maxim,refout-load-pF" is renamed to "maxim,refout-load".
> ---
> .../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 000000000000..dce421857efe
> --- /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 Bits® 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.
How about "clock specifier"
> +- clock-names: name of the fixed xtal clock, shall be "xtal".
If you have a single clock you could drop clock-names. You can obtain it
in the driver using clk_get(dev, NULL) . Up to you.
> +- 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 pico-farads) 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>;
> + clock-names = "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 0849618a9df0..2d1d28843c96 100644
> --- a/Documentation/devicetree/bindings/property-units.txt
> +++ b/Documentation/devicetree/bindings/property-units.txt
> @@ -30,6 +30,7 @@ Electricity
> -micro-ohms : micro Ohms
> -microwatt-hours: micro Watt-hours
> -microvolt : micro volts
> +-pico-farads : picofarads
Why pico-farads and not picofarads? Most of the existing definitions have
no dash. (Just wondering.)
--
Kind regards,
Sakari Ailus
sakari.ailus@xxxxxxxxxxxxxxx
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