Microchip mcp4725 and mcp4726 DAC device driver
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Required properties:
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- compatible: Must be "microchip,mcp4725" or "microchip,mcp4726"
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- reg: Should contain the DAC I2C address
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- vdd-supply: Phandle to the Vdd power supply. This supply is used as a
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voltage reference on mcp4725. It is used as a voltage reference on
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mcp4726 if there is no vref-supply specified.
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Optional properties (valid only for mcp4726):
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- vref-supply: Optional phandle to the Vref power supply. Vref pin is
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used as a voltage reference when this supply is specified.
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- microchip,vref-buffered: Boolean to enable buffering of the external
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Vref pin. This boolean is not valid without the vref-supply. Quoting
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the datasheet: This is offered in cases where the reference voltage
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does not have the current capability not to drop its voltage when
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connected to the internal resistor ladder circuit.
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Examples:
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/* simple mcp4725 */
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mcp4725@60 {
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compatible = "microchip,mcp4725";
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reg = <0x60>;
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vdd-supply = <&vdac_vdd>;
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};
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/* mcp4726 with the buffered external reference voltage */
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mcp4726@60 {
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compatible = "microchip,mcp4726";
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reg = <0x60>;
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vdd-supply = <&vdac_vdd>;
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vref-supply = <&vdac_vref>;
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microchip,vref-buffered;
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};
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