Re: [PATCH v2 3/4] Documentation: dt: iio: add mcp4725/6 dac device binding
From: Jonathan Cameron <hidden>
Date: 2016-10-15 14:08:52
Also in:
linux-iio
On 11/10/16 14:57, Tomas Novotny wrote:
Signed-off-by: Tomas Novotny <redacted>
Nicely documented. Just odd enough that I'll want a device tree Ack on this one before I take it. Thanks, Jonathan
quoted hunk
--- .../devicetree/bindings/iio/dac/mcp4725.txt | 35 ++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/mcp4725.txtdiff --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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