Document STMicroelectronics STM32 DAC (digital-to-analog converter). Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx> --- .../devicetree/bindings/iio/dac/st,stm32-dac.txt | 56 ++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt diff --git a/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt new file mode 100644 index 0000000..1981983 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt @@ -0,0 +1,56 @@ +STMicroelectronics STM32 DAC + +The STM32 DAC is a 12-bit voltage output digital-to-analog converter. The DAC +can be configured in 8- or 12-bit mode. In 12-bit mode, the data could be +left- or right-aligned. 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. + +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". +- #io-channel-cells = <1>: See the IIO bindings section "IIO consumers" in + Documentation/devicetree/bindings/iio/iio-bindings.txt +- st,dac-channel: Must be either 1 or 2, to define channel in use (e.g. + single channels: 1 or 2) + +Example: + dac: dac@40007400 { + compatible = "st,stm32h7-dac-core"; + reg = <0x40007400 0x400>; + clocks = <&clk>; + clock-names = "pclk"; + vref-supply = <®_vref>; + + dac1: dac@1 { + compatible = "st,stm32-dac"; + #io-channels-cells = <1>; + st,dac-channel = <1>; + }; + + dac2: dac@2 { + compatible = "st,stm32-dac"; + #io-channels-cells = <1>; + st,dac-channel = <2>; + }; + }; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html