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atmel,sam0-pinctrl

Vendor: Atmel Corporation

Description

Atmel SAM0 Pinctrl container node

The Atmel SAM0 pin controller is a singleton node responsible for controlling
pin function selection and pin properties. For example, you can use this node
to route SERCOM0 as UART were RX to pin PAD1 and enable the pull-up resistor
on the pin.

The node has the 'pinctrl' node label set in your SoC's devicetree, so you can
modify it like this:

  &pinctrl {
          /* your modifications go here */
  };

All device pin configurations should be placed in child nodes of the 'pinctrl'
node, as shown in this example:

  /** You can put this in places like a <board>-pinctrl.dtsi file in
    * your board directory, or a devicetree overlay in your application.
    */

  /** include pre-defined combinations for the SoC variant used by the board */
  #include <dt-bindings/pinctrl/samr21g-pinctrl.h>

  &pinctrl {
    /* configuration for the usart0 "default" state */
    sercom0_uart_default: sercom0_uart_default {
      /* group 1 */
      group1 {
        /* configure PA6 as USART0 TX and PA8 as USART0 CTS */
        pinmux = <PA5D_SERCOM0_PAD1>, <PA6D_SERCOM0_PAD2>;
      };
      /* group 2 */
      group2 {
        /* configure PA5 as USART0 RX and PA7 as USART0 RTS */
        pinmux = <PA4D_SERCOM0_PAD0>, <PA7D_SERCOM0_PAD3>;
        /* both PA5 and PA7 have pull-up enabled */
        bias-pull-up;
      };
    };
  };

The 'usart0_default' child node encodes the pin configurations for a
particular state of a device; in this case, the default (that is, active)
state.

As shown, pin configurations are organized in groups within each child node.
Each group can specify a list of pin function selections in the 'pinmux'
property.

A group can also specify shared pin properties common to all the specified
pins, such as the 'bias-pull-up' property in group 2. Here is a list of
supported standard pin properties:

- bias-pull-up: Enable pull-up resistor.
- bias-pull-down: Enable pull-down resistor.
- drive-strength: Increase sink current.
- input-enable: Enable input on pin.
- output-enable: Enable output on a pin without actively driving it.

To link pin configurations with a device, use a pinctrl-N property for some
number N, like this example you could place in your board's DTS file:

  #include "board-pinctrl.dtsi"

  &usart0 {
        pinctrl-0 = <&usart0_default>;
        pinctrl-names = "default";
  };

Properties

Top level properties

These property descriptions apply to “atmel,sam0-pinctrl” nodes themselves. This page also describes child node properties in the following sections.

Node specific properties

Deprecated node specific properties

Base properties

Properties not inherited from the base binding file.

(None)

Deprecated properties not inherited from the base binding file.

(None)

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,sam0-pinctrl” compatible.

Name	Type	Details
#address-cells	int	number of address cells in reg property This property is required. Constant value: 1
#size-cells	int	number of size cells in reg property This property is required. Constant value: 1
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
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.
power-domain	phandle	Power domain the device belongs to. The device will be notified when the power domain it belongs to is either suspended or resumed.

Grandchild node properties

Name	Type	Details
pinmux	array	An array of pins sharing the same group properties. The pins should be defined using pre-defined macros or, alternatively, using the SAM_PINMUX utility macros depending on the pinmux model used by the SoC series. This property is required.
drive-strength	int	The drive strength controls the output driver strength of an I/O pin configured as an output. 0: Pin drive strength is set to normal drive strength. 1: Pin drive strength is set to stronger drive strength. Legal values: 0, 1
bias-pull-up	boolean	enable pull-up resistor
bias-pull-down	boolean	enable pull-down resistor
input-enable	boolean	enable input on pin (no effect on output, such as enabling an input buffer)
output-enable	boolean	enable output on a pin without actively driving it (such as enabling an output buffer)