101 lines
3.1 KiB
YAML
101 lines
3.1 KiB
YAML
# Copyright (c) 2022, Telink Semiconductor
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# SPDX-License-Identifier: Apache-2.0
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description: |
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The Telink B91 pin controller is a singleton node responsible for
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controlling pin function selection and pin properties. For example, you can
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use this node to route UART0 TX to pin PB2 and enable the pull-up resistor
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on the 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 pre-defined pins and functions for the SoC used by the board */
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#include <dt-bindings/pinctrl/b91-pinctrl.h>
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&pinctrl {
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/* configuration for UART0 TX default state */
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uart0_tx_pb2_default: uart0_tx_pb2_default {
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/* configure PB2 as B91_FUNC_C */
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pinmux = <B91_PINMUX_SET(B91_PORT_B, B91_PIN_2, B91_FUNC_C)>;
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};
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/* configuration for UART0 RX default state */
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uart0_rx_pb3_default: uart0_rx_pb3_default {
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/* configure PB2 as B91_FUNC_C */
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pinmux = <B91_PINMUX_SET(B91_PORT_B, B91_PIN_3, B91_FUNC_C)>;
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};
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};
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The 'uart0_tx_pb2_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) state. 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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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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&uart0 {
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pinctrl-0 = <&uart0_tx_pb2_default &uart0_rx_pb3_default>;
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pinctrl-1 = <&uart0_tx_pb2_sleep &uart0_rx_pb3_sleep>;
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pinctrl-names = "default", "sleep";
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};
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compatible: "telink,b91-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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pad-mul-sel:
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type: int
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required: true
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description: |
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PinMux pad_mul_sel register value. Pin functions depend on it.
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For instance:
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Function C of PB2 configs the pin to UART0_TX if pad_mul_sel is set to <1>.
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But, the same function configs the same pin to DAC_I_DAT2_I if pad_mul_sel is set to <0>.
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Refer to the Telink TLSR9 specs to get more information about pins configuration.
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child-binding:
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description: |
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This binding gives a base representation of the Telink B91 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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properties:
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pinmux:
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required: true
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type: int
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description: |
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Telink B91 pin's configuration (port, pin and function).
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