64 lines
1.9 KiB
Plaintext
64 lines
1.9 KiB
Plaintext
|
STMicroelectronics STM32 DAC
|
||
|
|
|
||
|
|
The STM32 DAC is a 12-bit voltage output digital-to-analog converter. The DAC
|
||
|
|
may be configured in 8 or 12-bit mode. It has two output channels, each with
|
||
|
|
its own converter.
|
||
|
|
It has built-in noise and triangle waveform generator and supports external
|
||
|
|
triggers for conversions. The DAC's output buffer allows a high drive output
|
||
|
|
current.
|
||
|
|
|
||
|
|
Contents of a stm32 dac root node:
|
||
|
|
-----------------------------------
|
||
|
|
Required properties:
|
||
|
|
- compatible: Should be one of:
|
||
|
|
"st,stm32f4-dac-core"
|
||
|
|
"st,stm32h7-dac-core"
|
||
|
|
- reg: Offset and length of the device's register set.
|
||
|
|
- clocks: Must contain an entry for pclk (which feeds the peripheral bus
|
||
|
|
interface)
|
||
|
|
- clock-names: Must be "pclk".
|
||
|
|
- vref-supply: Phandle to the vref+ input analog reference supply.
|
||
|
|
- #address-cells = <1>;
|
||
|
|
- #size-cells = <0>;
|
||
|
|
|
||
|
|
Optional properties:
|
||
|
|
- resets: Must contain the phandle to the reset controller.
|
||
|
|
- A pinctrl state named "default" for each DAC channel may be defined to set
|
||
|
|
DAC_OUTx pin in mode of operation for analog output on external pin.
|
||
|
|
|
||
|
|
Contents of a stm32 dac child node:
|
||
|
|
-----------------------------------
|
||
|
|
DAC core node should contain at least one subnode, representing a
|
||
|
|
DAC instance/channel available on the machine.
|
||
|
|
|
||
|
|
Required properties:
|
||
|
|
- compatible: Must be "st,stm32-dac".
|
||
|
|
- reg: Must be either 1 or 2, to define (single) channel in use
|
||
|
|
- #io-channel-cells = <1>: See the IIO bindings section "IIO consumers" in
|
||
|
|
Documentation/devicetree/bindings/iio/iio-bindings.txt
|
||
|
|
|
||
|
|
Example:
|
||
|
|
dac: dac@40007400 {
|
||
|
|
compatible = "st,stm32h7-dac-core";
|
||
|
|
reg = <0x40007400 0x400>;
|
||
|
|
clocks = <&clk>;
|
||
|
|
clock-names = "pclk";
|
||
|
|
vref-supply = <®_vref>;
|
||
|
|
pinctrl-names = "default";
|
||
|
|
pinctrl-0 = <&dac_out1 &dac_out2>;
|
||
|
|
#address-cells = <1>;
|
||
|
|
#size-cells = <0>;
|
||
|
|
|
||
|
|
dac1: dac@1 {
|
||
|
|
compatible = "st,stm32-dac";
|
||
|
|
#io-channels-cells = <1>;
|
||
|
|
reg = <1>;
|
||
|
|
};
|
||
|
|
|
||
|
|
dac2: dac@2 {
|
||
|
|
compatible = "st,stm32-dac";
|
||
|
|
#io-channels-cells = <1>;
|
||
|
|
reg = <2>;
|
||
|
|
};
|
||
|
|
};
|