nxp,imx8m-pinctrl

Vendor: NXP Semiconductors N.V.

Description

The node has the 'pinctrl' node label set in MCUX SoC's devicetree. These
nodes can be autogenerated using the MCUXpresso config tools combined with
the imx_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 UART2 pins:

group0 {
    pinmux = <&iomuxc_uart2_rxd_uart_rx_uart2_rx,
        &iomuxc_uart2_txd_uart_tx_uart2_tx>;
    drive-strength = "40-ohm";
    slew-rate = "slow";
};

This will select UART2_RXD as UART2 rx, and UART2_TXD as UART2 tx.
Both pins will be configured with a slow slew rate, and maximum drive
strength.
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:
nxp,lvttl: LVTTL=1
input-schmitt-enable: HYS=1
bias-pull-up: PUE=1
drive-open-drain: ODE=1
slew-rate: SRE=<enum_idx>
drive-strength: DSE=<enum_idx>
input-enable: SION=1 (in SW_MUX_CTL_PAD register)

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

Properties

Top level properties

These property descriptions apply to “nxp,imx8m-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,imx8m-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 HI-Z — Output driver is disabled (Hi-Z State) 001 255_OHM — 255 Ohm @3.3V, 240 Ohm @2.5V, 230 Ohm @1.8V, 265 Ohm @1.2V 010 105_OHM — 105 Ohm @3.3V, 100 Ohm @2.5V, 85 Ohm @1.8V, 110 Ohm @1.2V 011 75_OHM — 75 Ohm @3.3V, 70 Ohm @2.5V, 60 Ohm @1.8V, 80 Ohm @1.2V 100 85_OHM — 85 Ohm @3.3V, 80 Ohm @2.5V, 75 Ohm @1.8V, 90 Ohm @1.2V 101 65_OHM — 65 Ohm @3.3V, 60 Ohm @2.5V, 55 Ohm @1.8V, 65 Ohm @1.2V 110 45_OHM — 45 Ohm @3.3V, 45 Ohm @2.5V, 40 Ohm @1.8V, 50 Ohm @1.2V 111 40_OHM — 40 Ohm @3.3V, 40 Ohm @2.5V, 33 Ohm @1.8V, 40 Ohm @1.2V This property is required. Legal values: 'disabled', '255-ohm', '105-ohm', '75-ohm', '85-ohm', '65-ohm', '45-ohm', '40-ohm'
slew-rate	string	Select slew rate for pin. Corresponds to SRE field in IOMUXC peripheral 00 SLOW — Slow Frequency Slew Rate (50Mhz) 01 MEDIUM — Medium Frequency Slew Rate (100Mhz) 10 FAST — Fast Frequency Slew Rate (150Mhz) 11 MAX — Max Frequency Slew Rate (200Mhz) This property is required. Legal values: 'slow', 'medium', 'fast', 'max'
nxp,lvttl	boolean	Enable LVTTL input. Sets LVTTL field in IOMUXC peripheral
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