st,stm32-dac.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: "http://devicetree.org/schemas/iio/dac/st,stm32-dac.yaml#"
    5 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
    6 
    7 title: STMicroelectronics STM32 DAC bindings
    8 
    9 description: |
   10   The STM32 DAC is a 12-bit voltage output digital-to-analog converter. The DAC
   11   may be configured in 8 or 12-bit mode. It has two output channels, each with
   12   its own converter.
   13   It has built-in noise and triangle waveform generator and supports external
   14   triggers for conversions. The DAC's output buffer allows a high drive output
   15   current.
   16 
   17 maintainers:
   18   - Fabrice Gasnier <fabrice.gasnier@foss.st.com>
   19 
   20 properties:
   21   compatible:
   22     enum:
   23       - st,stm32f4-dac-core
   24       - st,stm32h7-dac-core
   25 
   26   reg:
   27     maxItems: 1
   28 
   29   resets:
   30     maxItems: 1
   31 
   32   clocks:
   33     maxItems: 1
   34 
   35   clock-names:
   36     items:
   37       - const: pclk
   38 
   39   vref-supply:
   40     description: Phandle to the vref input analog reference voltage.
   41 
   42   '#address-cells':
   43     const: 1
   44 
   45   '#size-cells':
   46     const: 0
   47 
   48 additionalProperties: false
   49 
   50 required:
   51   - compatible
   52   - reg
   53   - clocks
   54   - clock-names
   55   - vref-supply
   56   - '#address-cells'
   57   - '#size-cells'
   58 
   59 patternProperties:
   60   "^dac@[1-2]+$":
   61     type: object
   62     description:
   63       A DAC block node should contain at least one subnode, representing an
   64       DAC instance/channel available on the machine.
   65 
   66     properties:
   67       compatible:
   68         const: st,stm32-dac
   69 
   70       reg:
   71         description: Must be either 1 or 2, to define (single) channel in use
   72         enum: [1, 2]
   73 
   74       '#io-channel-cells':
   75         const: 1
   76 
   77     additionalProperties: false
   78 
   79     required:
   80       - compatible
   81       - reg
   82       - '#io-channel-cells'
   83 
   84 examples:
   85   - |
   86     // Example on stm32mp157c
   87     #include <dt-bindings/clock/stm32mp1-clks.h>
   88     dac: dac@40017000 {
   89       compatible = "st,stm32h7-dac-core";
   90       reg = <0x40017000 0x400>;
   91       clocks = <&rcc DAC12>;
   92       clock-names = "pclk";
   93       vref-supply = <&vref>;
   94       #address-cells = <1>;
   95       #size-cells = <0>;
   96 
   97       dac@1 {
   98         compatible = "st,stm32-dac";
   99         #io-channel-cells = <1>;
  100         reg = <1>;
  101       };
  102 
  103       dac@2 {
  104         compatible = "st,stm32-dac";
  105         #io-channel-cells = <1>;
  106         reg = <2>;
  107       };
  108     };
  109 
  110 ...

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sys/contrib/device-tree/Bindings/iio/dac/st,stm32-dac.yaml