nxp,mcux-rt-pinctrl

Vendor: NXP Semiconductors N.V.

Description

The node has the 'pinctrl' node label set in MCUX RT SoC's devicetree. These
nodes can be autogenerated using the MCUXpresso config tools combined with
the rt_dts_gen.py script in NXP's HAL. The mux, mode, input, daisy, and cfg
fields in a group select the pins to be configured, and the remaining
devicetree properties set configuration values for those pins
for example, here is an group configuring LPUART1 pins:

group0 {
  pinmux = <&iomuxc_gpio_ad_b0_12_lpuart1_tx,
    &iomuxc_gpio_ad_b0_13_lpuart1_rx>;
  drive-strength = "r0-6";
  slew-rate = "slow";
  nxp,speed = "100-mhz";
};

This will select GPIO_AD_B0_12 as LPUART1 TX, and GPIO_AD_B0_13 as LPUART1 RX.
Both pins will be configured with a weak latch, drive strength of "r0-6",
slow slew rate, and 100 MHZ speed.
Note that the soc level iomuxc dts file can be examined to find the possible
pinmux options. Here are the affects of each property on the
IOMUXC SW_PAD_CTL register:
input-schmitt-enable: HYS=1
drive-open-drain: ODE=1
input-enable: SION=1 (in SW_MUX_CTL_PAD register)
bias-pull-down: PUE=1, PUS=<bias-pull-down-value>
bias-pull-up: PUE=1, PUS=<bias-pull-up-value>
bias-disable: PKE=0
slew-rate: SRE=<enum_idx>
drive-strength: DSE=<enum_idx>
nxp,speed: SPEED=<enum_idx>

If only required properties are supplied, the pin will have the following
configuration:
HYS=0,
ODE=0,
SION=0,
PUE=0,
PUS=0,
PKE=1,
SRE=<slew-rate>,
DSE=<drive-strength>,
SPEED=<nxp,speed>

Properties

Top level properties

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

Node specific properties

Properties not inherited from the base binding file.

(None)

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 “nxp,mcux-rt-pinctrl” 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.

Grandchild node properties

Name

Type

Details

pinmux

phandles

 
Pin mux selections for this group. See the soc level iomuxc DTSI file
for a defined list of these options.

This property is required.

drive-strength

string

 
Pin output drive strength. Sets the DSE field in the IOMUXC peripheral.
the drive strength is expressed as a output impedance at a given voltage,
but maximum current values can be calculated from these impedances
for a specific load impedance.
000 DSE_0_output_driver_disabled_ — output driver disabled
001 DSE_1_R0_1 — 157 Ohm impedance @3.3V, 260 Ohm impedance @1.8V
010 DSE_2_R0_2 — 78 Ohm @3.3V, 130 Ohm @1.8V
011 DSE_3_R0_3 — 53 Ohm @3.3V, 88 Ohm @1.8V
100 DSE_4_R0_4 — 39 Ohm @3.3V, 65 Ohm @1.8V
101 DSE_5_R0_5 — 32 Ohm @3.3V, 52 Ohm @1.8V
110 DSE_6_R0_6 — 32 Ohm @3.3V, 43 Ohm @1.8V
111 DSE_7_R0_7 — 26 Ohm @3.3V, 37 Ohm @1.8V

This property is required.

Legal values: 'disabled', 'r0', 'r0-2', 'r0-3', 'r0-4', 'r0-5', 'r0-6', 'r0-7'

bias-pull-up-value

string

 
Select the value of the pull up resistor present on this pin
Corresponds to the PUS field in the IOMUXC peripheral.
47k resistor selected as default due to this being the default pullup
value on most SOC pins
00 Unused- no change will be applied to pin
01 PUS_1_47K_Ohm_Pull_Up — 47K Ohm Pull Up
10 PUS_2_100K_Ohm_Pull_Up — 100K Ohm Pull Up
11 PUS_2_22K_Ohm_Pull_Up — 22K Ohm Pull Up

Default value: 47k

Legal values: 'unused', '47k', '100k', '22k'

bias-pull-down-value

string

 
Select the value of the pull up resistor present on this pin
Corresponds to the PUS field in the IOMUXC peripheral. 100k is
currently the only supported pull down resistance.
00 PUS_0_100K_Ohm_Pull_Down - 100K Ohm Pull Down

Default value: 100k

Legal values: '100k'

slew-rate

string

 
Select slew rate for pin. Corresponds to SRE field in IOMUXC peripheral
0 SRE_0_Slow_Slew_Rate — Slow Slew Rate
1 SRE_1_Fast_Slew_Rate — Fast Slew Rate

This property is required.

Legal values: 'slow', 'fast'

nxp,speed

string

 
Sets pin speed. Corresponds to SPEED field in IOMUXC peripheral
00 SPEED_0_low_50MHz_ — low(50MHz)
01 SPEED_1_medium_100MHz_ — medium(100MHz)
10 SPEED_2_medium_150MHz_ — medium(150MHz)
11 SPEED_3_max_200MHz_ — max(200MHz)

Legal values: '50-mhz', '100-mhz', '150-mhz', '200-mhz'

bias-disable

boolean

 
disable any pin bias

bias-pull-up

boolean

 
enable pull-up resistor

bias-pull-down

boolean

 
enable pull-down resistor

drive-open-drain

boolean

 
drive with open drain (hardware AND)

input-enable

boolean

 
enable input on pin (e.g. enable an input buffer, no effect on output)

input-schmitt-enable

boolean

 
enable schmitt-trigger mode