atmel-xplained-header

Description

GPIO pins exposed on Atmel Xplained headers.

The Xplained layout provide a standard 10 pin header.  A board can have
one or more headers and can share pins.  This connector was developed to
match with Atmel AVR XMEGA devices GPIO port plus power signals.  The Atmel
Xplained Pro standard connector keep compatibility with this header and it
can be defined on every board with an Xplained Pro Connector extension and
every pin can be defined as general purpose GPIO.

The AVR XMEGA port was designed as:

Signal  Main Function
   Px0  SDA
   Px1  SCL
   Px2  RX
   Px3  TX
   Px4  SS
   Px5  MOSI
   Px6  MISO
   Px7  SCK
   GND
   VDD

Documentation:
* https://www.microchip.com/development-tools/xplained-boards
* http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-42091-Atmel-Xplained-Pro-Hardware-Development-Kit_User%20Guide.pdf

This binding provides a nexus mapping for 10 pins where pins are disposed
to have a even and odd column:

                       Connector
Bind      Pin Name     Pin   Pin  Pin Name        Bind
  0          I2C(SDA)  1       2  I2C(SCL)         1
  2          UART(RX)  3       4  UART(TX)         3
  4          SPI(CS0)  5       6  SPI(MOSI)        5
  6         SPI(MISO)  7       8  SPI(SCK)         7
                  GND  9      10  VDD(+3.3V)

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 “atmel-xplained-header” 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.