94 lines
3.0 KiB
YAML
94 lines
3.0 KiB
YAML
# Copyright (c) 2021 IoT.bzh
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# SPDX-License-Identifier: Apache-2.0
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description: |
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Renesas R-Car Pin Function Controller node
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This binding gives a base representation of the R-Car pins configuration.
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The R-Car pin controller is a singleton node responsible for controlling
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pin function selection and pin properties. For example, you can use this
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node to route CAN0 TX A to pin 'RD', and enable pull-up resistor as well
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as driving ability.
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The node has the 'pfc' node label set in your SoC's devicetree, so you can
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modify it like this:
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&pfc {
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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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'pfc' 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 pre-defined pins and functions for the SoC used by the board */
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#include <dt-bindings/pinctrl/renesas/pinctrl-r8a77951.h>
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&pfc {
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/* configuration for can0 data a tx default state */
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can0_data_a_tx_default: can0_data_a_tx_default {
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/* configure PIN_RD as FUNC_CAN0_TX_A */
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pin = <PIN_RD FUNC_CAN0_TX_A>;
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};
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/* configuration for can0 data a rx default state */
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can0_data_a_rx_default: can0_data_a_rx_default {
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/* configure PIN_RD_WR as FUNC_CAN0_RX_A */
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pin = <PIN_RD_WR FUNC_CAN0_RX_A>;
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};
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};
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The 'can0_data_a_tx_default' child node encodes the pin configurations
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for a particular state of a device; in this case, the default
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(that is, active) sate. You would specify the low-power configuration for
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the same device in a separate child node.
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A pin configuration can also specify pin properties such as the
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'bias-pull-up' property. Here is a list of supported standard pin
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properties:
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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-strength
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To link pin configurations with a device, use a pinctrl-N property for some
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number N, like this example you could place in your board's DTS file:
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#include "board-pinctrl.dtsi"
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&can0 {
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pinctrl-0 = <&can0_data_a_tx_default &can0_data_a_rx_default>;
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pinctrl-1 = <&can0_data_a_tx_sleep &can0_data_a_rx_sleep>;
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pinctrl-names = "default", "sleep";
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};
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compatible: "renesas,rcar-pfc"
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include:
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- name: base.yaml
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- name: pincfg-node.yaml
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child-binding:
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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-strength
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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 R-Car pins configuration.
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properties:
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pin:
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type: array
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required: true
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description: |
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The array is expected to have up to two elements. The first element is
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the pin the second optional element is the pin function.
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drive-strength:
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enum: [ 3, 6, 9, 12, 15, 18, 21, 24 ]
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