Commit 48428d17 authored by Fabrice Gasnier's avatar Fabrice Gasnier Committed by Jonathan Cameron

dt-bindings: iio: stm32-dac: Add support for STM32 DAC

Document STMicroelectronics STM32 DAC (digital-to-analog converter).
Signed-off-by: default avatarFabrice Gasnier <fabrice.gasnier@st.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent ddf9ee40
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: Must be "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 = <&reg_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>;
};
};
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