arduino-header-r3

Description

GPIO pins exposed on Arduino Uno (R3) headers.

The Arduino Uno layout provides four headers, two each along
opposite edges of the board.

Proceeding counter-clockwise:
* An 8-pin Power Supply header.  No pins on this header are exposed
  by this binding.
* A 6-pin Analog Input header.  This has analog input signals
  labeled from A0 at the top through A5 at the bottom.
* An 8-pin header (opposite Analog Input).  This has digital input
  signals labeled from D0 at the bottom D7 at the top;
* A 10-pin header (opposite Power Supply).  This has six additional
  digital input signals labelled from D8 at the bottom through D13
  towards the top, skipping two pins, then finishing with D14 and
  D15 at the top.

This binding provides a nexus mapping for 20 pins where parent pins 0
through 5 correspond to A0 through A5, and parent pins 6 through 21
correspond to D0 through D15, as depicted below:

                             D15  21
                             D14  20
                             AREF -
                             GND  -
    - N/C                    D13  19
    - IOREF                  D12  18
    - RESET                  D11  17
    - 3V3                    D10  16
    - 5V                     D9   15
    - GND                    D8   14
    - GND
    - VIN                    D7   13
                             D6   12
    0 A0                     D5   11
    1 A1                     D4   10
    2 A2                     D3    9
    3 A3                     D2    8
    4 A4                     D1    7
    5 A5                     D0    6

Properties

Properties not inherited from the base binding file.

Name	Type	Details
`gpio-map`	`compound`	This property is required.
`gpio-map-mask`	`compound`
`gpio-map-pass-thru`	`compound`
`#gpio-cells`	`int`	Number of items to expect in a GPIO specifier This property is required.

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 “arduino-header-r3” 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.
`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
`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.