112 lines
3.9 KiB
YAML
112 lines
3.9 KiB
YAML
# Copyright (c) 2022, Andriy Gelman <andriy.gelman@gmail.com>
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# SPDX-License-Identifier: Apache-2.0
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description: |
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The Infineon XMC4XXX pin controller is responsible for connecting peripheral outputs
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to specific port/pins (also known as alternate functions) and configures pin properties.
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The pinctrl settings are referenced in a device tree peripheral node. For example in a UART
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node:
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&usic1ch1 {
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compatible = "infineon,xmc4xxx-uart";
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pinctrl-0 = <&uart_tx_p0_1_u1c1 &uart_rx_p0_0_u1c1>;
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pinctrl-names = "default";
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input-src = "DX0D";
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...
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};
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pinctrl-0 is the phandle that stores the pin settings for two pins: &uart_tx_p0_1_u1c1
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and &uart_rx_p0_0_u1c1. These nodes are pre-defined and their naming convention is designed
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to help the user select the correct pin settings. Note the use of peripheral type,
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pin direction, port/pin number and USIC in the name.
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The pre-defined nodes only set the alternate function of the output pin. The
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configuration for the pin (i.e. drive strength) should be set in the board setup.
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The set of possible configurations are defined in the properties section below (in addition
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to the inherited property-allowlist list from pincfg-node.yaml).
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To create a new pin configuration, the user may append to the &pinctrl node, for example
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#include <zephyr/dt-bindings/pinctrl/xmc4xxx-pinctrl.h>
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&pinctrl {
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my_node_config: my_node_config {
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pinmux = <XMC4XXX_PINMUX_SET(0, 1, 2)>;
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drive-push-pull;
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... other supported pin configurations ..
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};
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where XMC4XXX_PINMUX_SET(PORT, PIN, ALTERNATE_FUNCTION) is a helper macro for setting the
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alternate function for a given port/pin. Setting ALTERNATE_FUNCTION = 0 means that no
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alternate function is selected.
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The pinctrl driver only sets the alternate function for output pins. The input mux is
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handled by the peripheral drivers. For example the &usic1ch1 node has input-src property for
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this purpose. There are no pre-defined nodes for the input mux and this must be properly set
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by the user. Refer to the peripheral .yaml file (i.e. infineon,xmc4xxx-uart.yaml) and
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XMC4XXX documentation.
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compatible: "infineon,xmc4xxx-pinctrl"
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include: base.yaml
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properties:
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"#address-cells":
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required: true
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const: 1
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"#size-cells":
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required: true
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const: 1
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child-binding:
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description: Each child node defines the configuration for a particular state.
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include:
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- name: pincfg-node.yaml
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property-allowlist:
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- bias-pull-down
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- bias-pull-up
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- drive-push-pull
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- drive-open-drain
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- output-high
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- output-low
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properties:
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pinmux:
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description: |
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Encodes port/pin and alternate function. See helper macro XMC4XX_PINMUX_SET().
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Alternate function is only set for output pins; It selects ALT1-ALT4
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output line in the GPIO element. The alternate function for input pins is
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handled separately by the peripheral. It is upto the peripheral to configure which
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input pin to use (For example see parameter input-src in infineon,xmc4xxx-uart.yaml).
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required: true
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type: int
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drive-strength:
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description: |
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Drive strength of the output pin. Following options as in XMC_GPIO_OUTPUT_STRENGTH
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See xmc4_gpio.h. This only has an effect if the pin is in drive-push-pull mode.
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required: true
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type: string
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enum:
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- "strong-sharp-edge"
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- "strong-medium-edge"
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- "strong-soft-edge"
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- "strong-slow-edge"
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- "medium"
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- "medium-unknown1-edge"
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- "medium-unknown2-edge"
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- "weak"
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invert-input:
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description: Inverts the input.
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type: boolean
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hwctrl:
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description: Pre-assigns hardware control of the pin to a certain peripheral.
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required: true
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type: string
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enum:
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- "disabled"
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- "periph1"
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- "periph2"
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