espressif,esp32-dac

Vendor: Espressif Systems

Note

An implementation of a driver matching this compatible is available in drivers/dac/dac_esp32.c.

Description

Espressif Digital to Analog converter (DAC) control node
is part of the RTC low-power domain and belongs to the SENSE
peripherals set. RTC peripherals has GPIOs controlled by the
RTCIO mux, which is separated from the main IO mux.

Two GPIO pads can only be connected to the DAC peripheral.

ESP32 pads
  - GPIO25 as DAC channel 1
  - GPIO26 as DAC channel 2

ESP32-S2 pads
  - GPIO17 as DAC channel 1
  - GPIO18 as DAC channel 2

To enable the DAC peripheral it must be enabled in the board
dts, or in subsequent overlay file.

      &dac {
          status = "okay";
      };

To specify the DAC channel to use, dts overlay must include
properties 'dac-channel-id', which uses zero based channel index.
Variable 'dac-resolution' must be also specified, although ESP32
only supported resolution is 8bits.

      / {
        zephyr,user {
          dac = <&dac>;
          dac-channel-id = <0>;
          dac-resolution = <8>;
        };
      };

NOTE: The DAC peripheral outputs are fixed to gpio pads, therefore
      it does not need to be controlled by the pinctrl node.

Properties

Node specific properties

Properties not inherited from the base binding file.

Name

Type

Details

#io-channel-cells

int

This property is required.

Constant value: 1

Deprecated node specific properties

Deprecated properties not inherited from the base binding file.

(None)

Base properties

Properties inherited from the base binding file, which defines common properties that may be set on many nodes. Not all of these may apply to the “espressif,esp32-dac” compatible.

Name

Type

Details

status

string

 
indicates the operational status of a device

Legal values: 'ok', 'okay', 'disabled', 'reserved', 'fail', 'fail-sss'

See Important properties for more information.

compatible

string-array

 
compatible strings

This property is required.

See Important properties for more information.

reg

array

 
register space

See Important properties for more information.

reg-names

string-array

 
name of each register space

interrupts

array

 
interrupts for device

See Important properties for more information.

interrupts-extended

compound

 
extended interrupt specifier for device

interrupt-names

string-array

 
name of each interrupt

interrupt-parent

phandle

 
phandle to interrupt controller node

label

string

 
Human readable string describing the device (used as device_get_binding() argument)

See Important properties for more information.

This property is deprecated.

clocks

phandle-array

 
Clock gate information

clock-names

string-array

 
name of each clock

#address-cells

int

 
number of address cells in reg property

#size-cells

int

 
number of size cells in reg property

dmas

phandle-array

 
DMA channels specifiers

dma-names

string-array

 
Provided names of DMA channel specifiers

io-channels

phandle-array

 
IO channels specifiers

io-channel-names

string-array

 
Provided names of IO channel specifiers

mboxes

phandle-array

 
mailbox / IPM channels specifiers

mbox-names

string-array

 
Provided names of mailbox / IPM channel specifiers

power-domains

phandle-array

 
Power domain specifiers

power-domain-names

string-array

 
Provided names of power domain specifiers

#power-domain-cells

int

 
Number of cells in power-domains property

zephyr,deferred-init

boolean

 
Do not initialize device automatically on boot. Device should be manually
initialized using device_init().

wakeup-source

boolean

 
Property to identify that a device can be used as wake up source.

When this property is provided a specific flag is set into the
device that tells the system that the device is capable of
wake up the system.

Wake up capable devices are disabled (interruptions will not wake up
the system) by default but they can be enabled at runtime if necessary.

zephyr,pm-device-runtime-auto

boolean

 
Automatically configure the device for runtime power management after the
init function runs.

zephyr,disabling-power-states

phandles

 
List of power states that will disable this device power.

Specifier cell names

  • io-channel cells: output