On 11/10/16 14:57, Tomas Novotny wrote:
> Signed-off-by: Tomas Novotny <tomas@xxxxxxxxxx>
Nicely documented. Just odd enough that I'll want a device tree Ack on this one
before I take it.
Thanks,
Jonathan
> ---
> .../devicetree/bindings/iio/dac/mcp4725.txt | 35 ++++++++++++++++++++++
> 1 file changed, 35 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iio/dac/mcp4725.txt
>
> diff --git a/Documentation/devicetree/bindings/iio/dac/mcp4725.txt b/Documentation/devicetree/bindings/iio/dac/mcp4725.txt
> new file mode 100644
> index 0000000..1bc6c09
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/dac/mcp4725.txt
> @@ -0,0 +1,35 @@
> +Microchip mcp4725 and mcp4726 DAC device driver
> +
> +Required properties:
> + - compatible: Must be "microchip,mcp4725" or "microchip,mcp4726"
> + - reg: Should contain the DAC I2C address
> + - vdd-supply: Phandle to the Vdd power supply. This supply is used as a
> + voltage reference on mcp4725. It is used as a voltage reference on
> + mcp4726 if there is no vref-supply specified.
> +
> +Optional properties (valid only for mcp4726):
> + - vref-supply: Optional phandle to the Vref power supply. Vref pin is
> + used as a voltage reference when this supply is specified.
> + - microchip,vref-buffered: Boolean to enable buffering of the external
> + Vref pin. This boolean is not valid without the vref-supply. Quoting
> + the datasheet: This is offered in cases where the reference voltage
> + does not have the current capability not to drop its voltage when
> + connected to the internal resistor ladder circuit.
It is particularly nice to have this description of the 'why' in here.
I wish more docs did this!
> +
> +Examples:
> +
> + /* simple mcp4725 */
> + mcp4725@60 {
> + compatible = "microchip,mcp4725";
> + reg = <0x60>;
> + vdd-supply = <&vdac_vdd>;
> + };
> +
> + /* mcp4726 with the buffered external reference voltage */
> + mcp4726@60 {
> + compatible = "microchip,mcp4726";
> + reg = <0x60>;
> + vdd-supply = <&vdac_vdd>;
> + vref-supply = <&vdac_vref>;
> + microchip,vref-buffered;
> + };
>
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