105 lines
3.3 KiB
YAML
105 lines
3.3 KiB
YAML
# Copyright (c) 2020 Linaro Limited
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# SPDX-License-Identifier: Apache-2.0
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description: |
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STM32 Pin controller Node
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Based on pincfg-node.yaml binding.
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Note: `bias-disable` and `drive-push-pull` are default pin configurations.
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They will be applied in case no `bias-foo` or `driver-bar` properties
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are set.
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compatible: "st,stm32-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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remap-pa11:
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type: boolean
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description: Remaps the PA11 pin to operate as PA9 pin.
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Use of this property is restricted to STM32G0 and STM32C0 SoCs.
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remap-pa12:
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type: boolean
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description: Remaps the PA12 pin to operate as PA10 pin.
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Use of this property is restricted to STM32G0 and STM32C0 SoCs.
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remap-pa11-pa12:
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type: boolean
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description: Remaps the PA11/PA12 pin to operate as PA9/PA10 pin.
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Use of this property is restricted to STM32F070x SoCs.
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child-binding:
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description: |
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This binding gives a base representation of the STM32 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-push-pull
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- drive-open-drain
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- output-low
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- output-high
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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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Reused from
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https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml
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Integer array, represents gpio pin number and mux setting.
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These defines are calculated as: ((port * 16 + line) << 8) | function
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With:
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- port: The gpio port index (PA = 0, PB = 1, ..., PK = 11)
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- line: The line offset within the port (PA0 = 0, PA1 = 1, ..., PA15 = 15)
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- function: The function number, can be:
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* 0 : Alternate Function 0
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* 1 : Alternate Function 1
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* 2 : Alternate Function 2
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* ...
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* 15 : Alternate Function 15
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* 16 : Analog
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* 17 : GPIO
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In case selected pin function is GPIO, pin is statically configured as
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a plain input/output GPIO. Default configuration is input. Output value
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can be configured by adding 'ouptut-low' or 'output-high' properties
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to the pin configuration.
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To simplify the usage, macro is available to generate "pinmux" field.
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This macro is available here:
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-include/zephyr/dt-bindings/pinctrl/stm32-pinctrl-common.h
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Some examples of macro usage:
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GPIO A9 set as alternate function 2
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... {
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pinmux = <STM32_PINMUX('A', 9, AF2)>;
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};
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GPIO A9 set as analog
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... {
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pinmux = <STM32_PINMUX('A', 9, ANALOG)>;
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};
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GPIO A9 set as GPIO output high
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... {
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pinmux = <STM32_PINMUX('A', 9, GPIO)>;
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output-high;
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};
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slew-rate:
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type: string
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default: "low-speed"
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enum:
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- "low-speed" # Default value.
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- "medium-speed"
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- "high-speed"
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- "very-high-speed"
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description: |
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Pin speed. Default to low-speed. For few pins (PA11 and
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PB3 depending on SoCs)hardware reset value could differ
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(very-high-speed). Carefully check reference manual for these pins.
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