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nxp,lpc-iocon-pinctrl

Vendor: NXP Semiconductors

Description

LPC pinctrl node. This node defines pin configurations in pin groups, and has
the 'pinctrl' node identifier in the SOC's devicetree. Each group within the
pin configuration defines a peripheral's pin configuration. Each numbered
subgroup represents pins with shared configuration for that peripheral. The
'pinmux' property of each group selects the pins to be configured with these
properties. For example, here is a configuration for FLEXCOMM0 pins:

pinmux_flexcomm0_usart: pinmux_flexcomm0_usart {
  group0 {
    pinmux = <FC0_TXD_SCL_MISO_WS_PIO0_30>,
            <FC0_RXD_SDA_MOSI_DATA_PIO0_29>;
    slew-rate = "standard";
  };
};

If only the required properties are supplied, the ICON_PIO register will
be assigned the following values:
IOCON_FUNC=<pin mux selection>,
IOCON_MODE=0,
IOCON_SLEW=<slew-rate selection>,
IOCON_INVERT=0,
IOCON_DIGIMODE=1,
IOCON_OD=0,

Values for I2C type and analog type pins have the following defaults:
IOCON_ASW=0
IOCON_SSEL=0
IOCON_FILTEROFF=1
IOCON_ECS=0
IOCON_EGP=1
IOCON_I2CFILTER=1

Note the inherited pinctrl properties defined below have the following effects:
drive-open-drain: IOCON_OD=1
bias-pull-up: IOCON_MODE=2
bias-pull-down: IOCON_MODE=1
drive-push-pull: IOCON_MODE=3

Note: for the LPC11u6x, the following fields are also supported:
IOCON_HYS- set by input-schmitt-enable
IOCON_S_MODE- set by nxp,digital-filter
IOCON_CLKDIV- set by nxp,filter-clock-div
IOCON_FILTR- set by nxp,analog-filter

Properties

Top level properties

These property descriptions apply to “nxp,lpc-iocon-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

array

Pin mux selection for this group. See the SOC level pinctrl header
file in NXP's HAL for a defined list of these options.

This property is required.

slew-rate

string

Pin output slew rate. Sets the SLEW field in the IOCON register.
defaults to standard slew rate, due to this being the reset value of
the field.
0 SLEW_0- standard mode, output slew rate is slower
1 SLEW_1- fast mode, output slew rate is faster

Default value: standard

Legal values: 'standard', 'fast'

nxp,invert

boolean

Invert the pin input logic level

nxp,analog-mode

boolean

Set the pin to analog mode. Sets DIGIMODE=0, and ASW=1. Only valid for
analog type pins.

power-source

string

Pin output power source. Only valid for I2C mode pins running in I2C
mode.

Legal values: '3v3', '1v8'

nxp,digital-filter

boolean

Digital input filter. Noise pulses below 10ms are filtered out.

nxp,i2c-filter

string

I2C glitch filter speed. Only valid for I2C mode pins. Fast mode
typically only required for High speed I2C.

Legal values: 'slow', 'fast'

nxp,i2c-speed

string

I2C speed. Only valid for I2C mode pins. Fast mode should be used for
fast mode plus I2C.

Legal values: 'slow', 'fast'

nxp,i2c-pullup

boolean

Enable I2C pullup resistor. If not present, pin is open drain in I2C
mode. Only valid for I2C mode pins in I2C mode

nxp,i2c-mode

boolean

Enable I2C mode for a pin. If not present, pin is in GPIO mode. Only
valid for I2C mode pins

bias-pull-up

boolean

enable pull-up resistor

bias-pull-down

boolean

enable pull-down resistor

drive-push-pull

boolean

drive actively high and low

drive-open-drain

boolean

drive with open drain (hardware AND)

input-schmitt-enable

boolean

enable schmitt-trigger mode