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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.
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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