137 lines
3.9 KiB
YAML
137 lines
3.9 KiB
YAML
# Copyright (c) 2022 Vaishnav Achath
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# SPDX-License-Identifier: Apache-2.0
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description: |
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TI SimpleLink CC13xx / CC26xx pinctrl node.
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Device pin configuration should be placed in the child nodes of this node.
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Populate the 'pinmux' field with a pair consisting of a pin number and its IO
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functions.
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The node has the 'pinctrl' node label set in your SoC's devicetree,
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so you can modify it like this:
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&pinctrl {
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/* your modifications go here */
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};
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All device pin configurations should be placed in child nodes of the
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'pinctrl' node, as in the i2c0 example shown at the end.
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Here is a list of
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supported standard pin properties:
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- bias-disable: Disable pull-up/down.
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- bias-pull-down: Enable pull-down resistor.
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- bias-pull-up: Enable pull-up resistor.
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- drive-open-drain: Output driver is open-drain.
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- drive-open-drain: Output driver is open-source.
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- drive-strength: Minimum current that can be sourced from the pin.
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- input-enable: enable input.
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- input-schmitt-enable: enable input schmitt circuit.
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- ti,input-edge-detect: enable and configure edge detection interrupts
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An example for CC13XX family, include the chip level pinctrl
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DTSI file in the board level DTS:
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#include <dt-bindings/pinctrl/cc13xx_cc26xx-pinctrl.h>
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We want to configure the I2C pins to open drain, with pullup enabled
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and input enabled.
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To change a pin's pinctrl default properties add a reference to the
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pin in the board's DTS file and set the properties.
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&i2c0 {
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pinctrl-0 = <&i2c0_scl_default &i2c0_sda_default>;
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pinctrl-1 = <&i2c0_scl_sleep &i2c0_sda_sleep>;
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pinctrl-names = "default", "sleep";
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}
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The i2c0_scl_default corresponds to the following in the board dts file:
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&pinctrl {
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i2c0_scl_default: i2c0_scl_default {
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pinmux = <4 IOC_PORT_MCU_I2C_MSSCL>;
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bias-pull-up;
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drive-open-drain;
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input-enable;
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};
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};
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To configure an input pin with edge detection (e.g. to count pulses):
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&pinctrl {
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gpt0_edge_counter: gpt0_edge_counter {
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pinmux = <15 IOC_PORT_MCU_PORT_EVENT0>;
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input-enable;
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bias-pull-up;
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ti,input-edge-detect = <IOC_RISING_EDGE>;
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};
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};
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To configure an output pin (e.g. for PWM output):
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&pinctrl {
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gpt0_pwm: gpt0_pwm {
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pinmux = <16 IOC_PORT_MCU_PORT_EVENT1>;
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bias-disable;
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drive-strength = <8>; /* in mA */
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};
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};
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compatible: "ti,cc13xx-cc26xx-pinctrl"
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include: base.yaml
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properties:
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reg:
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required: true
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child-binding:
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description: |
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This binding gives a base representation of the CC13XX/CC26XX
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pins configuration.
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include:
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- name: pincfg-node.yaml
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property-allowlist:
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- bias-disable
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- bias-pull-down
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- bias-pull-up
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- drive-open-drain
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- drive-open-source
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- drive-strength
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- input-enable
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- input-schmitt-enable
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properties:
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pinmux:
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required: true
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type: array
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description: |
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CC13XX/CC26XX pin's configuration (IO pin, IO function).
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drive-strength:
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enum:
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- 2
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- 4
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- 8
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default: 2
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description: |
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The drive strength controls the minimum output driver strength of an I/O pin
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configured as an output.
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2: min 2 mA (SoC default)
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4: min 4 mA
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8: min 8 mA for double drive strength IOs, min 4 mA for normal IOs
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ti,input-edge-detect:
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type: int
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default: 0 # no edge detection
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description: |
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Enables or disables the edge detection interrupt and configures it:
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IOC_NO_EDGE: No edge detection (SoC default)
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IOC_FALLING_EDGE: Edge detection on falling edge
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IOC_RISING_EDGE: Edge detection on rising edge
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IOC_BOTH_EDGES: Edge detection on both edges
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