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nxp,imx7d-pinctrl

Vendor: NXP Semiconductors

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

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:
bias-pull-up: PE=1, PS=<bias-pull-up-value index>
bias-pull-down: PE=1, PS=0
input-schmitt-enable: HYS=1
slew-rate: SRE=<enum idx>
drive-strength: DSE=<enum idx>
input-enable: SION=1 (in SW_PAD_CTL_MUX register)

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

Note that pins marked with LPSR can only have their PE and PS registers
configured

Properties

Top level properties

These property descriptions apply to “nxp,imx7d-pinctrl” nodes themselves. This page also describes child node properties in the following sections.

Properties not inherited from the base binding file.

(None)

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.

This property is required.

Legal values: 'x1', 'x4', 'x2', 'x6'

slew-rate

string

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

This property is required.

Legal values: 'fast', 'slow'

bias-pull-up-value

string

Select pull up resistor value. Sets PS field in IOMUXC peripheral.
Default of 100k as this is most common default register value for
SOC pads.
01: 5K- 5K pull up resistor
10: 47K- 47K pull up resistor
11: 100K- 100K pull up resistor

Default value: 100k

Legal values: 'unused', '5k', '47k', '100k'

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)

input-schmitt-enable

boolean

enable schmitt-trigger mode