From 48428d17325291f5be8c0420efca7e312587d9ad Mon Sep 17 00:00:00 2001 From: Fabrice Gasnier Date: Mon, 10 Apr 2017 17:49:49 +0200 Subject: [PATCH] dt-bindings: iio: stm32-dac: Add support for STM32 DAC Document STMicroelectronics STM32 DAC (digital-to-analog converter). Signed-off-by: Fabrice Gasnier Acked-by: Rob Herring Signed-off-by: Jonathan Cameron --- .../devicetree/bindings/iio/dac/st,stm32-dac.txt | 61 ++++++++++++++++++++++ 1 file changed, 61 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 000000000000..bcee71f808d0 --- /dev/null +++ b/Documentation/devicetree/bindings/iio/dac/st,stm32-dac.txt @@ -0,0 +1,61 @@ +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 = <®_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>; + }; + }; -- 2.11.0