97 lines
3.1 KiB
YAML
97 lines
3.1 KiB
YAML
# Copyright (c) 2022 Renesas Electronics Corporation
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# SPDX-License-Identifier: Apache-2.0
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description: |
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The SmartBond pin controller is a singleton node responsible for controlling
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pin function selection and pin properties, such as routing a UART RX to pin
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P1.8 and enabling the pullup resistor on that pin.
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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 shown in this example:
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/* You can put this in places like a board-pinctrl.dtsi file in
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* your board directory, or a devicetree overlay in your application.
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*/
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/* include definitions and utility macros for the SoC used by the board */
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#include <dt-bindings/pinctrl/smartbond-pinctrl.h>
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&pinctrl {
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/* configuration for uart device, default state */
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uart_default: uart_default {
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/* group 1 */
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group1 {
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/* route UART TX to P0.9 */
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pinmux = <SMARTBOND_PINMUX(UART_TX, 0, 9)>;
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};
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/* group 2 */
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group2 {
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/* route UART RX to P0.8 and enable pull-up */
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pinmux = <SMARTBOND_PINMUX(UART_RX, 0, 8)>;
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bias-pull-up;
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};
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};
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};
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The 'uart0_default' child node encodes the pin configurations for a
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particular state of a device; in this case, the default (that is, active)
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state.
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As shown, pin configurations are organized in groups within each child node.
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Each group can specify a list of pin function selections in the 'pinmux'
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property. Note that 'pinmux' property is an array so you can configure multiple
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pins at once there. The SMARTBOND_PINMUX macro is used to create pinmux value.
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A group can also specify shared pin properties common to all the specified
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pins, such as the 'bias-pull-up' property in group 2. Here is a list of
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supported standard pin properties:
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- bias-pull-up: Enable pull-up resistor.
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- bias-pull-down: Enable pull-down resistor.
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Note that bias options are mutually exclusive.
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To link this pin configuration with a device, use a pinctrl-N property
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for some number N, like this example you could place in your board's DTS
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file:
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#include "board-pinctrl.dtsi"
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&uart {
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pinctrl-0 = <&uart_default>;
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pinctrl-names = "default";
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};
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compatible: "renesas,smartbond-pinctrl"
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include: base.yaml
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child-binding:
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description: |
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Definitions for a pinctrl state.
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child-binding:
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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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- output-enable
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- input-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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An array of pins sharing the same group properties. The pins should
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be defined using the SMARTBOND_PINMUX utility macro that encodes the port,
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pin and function.
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