134 lines
2.7 KiB
YAML
134 lines
2.7 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/serial/st,stm32-uart.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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maintainers:
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- Erwan Le Ray <erwan.leray@st.com>
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title: STMicroelectronics STM32 USART bindings
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properties:
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compatible:
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enum:
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- st,stm32-uart
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- st,stm32f7-uart
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- st,stm32h7-uart
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reg:
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maxItems: 1
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interrupts:
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maxItems: 1
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clocks:
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maxItems: 1
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resets:
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maxItems: 1
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label:
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description: label associated with this uart
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st,hw-flow-ctrl:
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description: enable hardware flow control (deprecated)
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$ref: /schemas/types.yaml#/definitions/flag
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uart-has-rtscts: true
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rx-tx-swap: true
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dmas:
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minItems: 1
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maxItems: 2
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dma-names:
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items:
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enum: [ rx, tx ]
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minItems: 1
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maxItems: 2
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# cts-gpios and rts-gpios properties can be used instead of 'uart-has-rtscts'
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# or 'st,hw-flow-ctrl' (deprecated) for making use of any gpio pins for flow
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# control instead of dedicated pins.
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#
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# It should be noted that both cts-gpios/rts-gpios and 'uart-has-rtscts' or
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# 'st,hw-flow-ctrl' (deprecated) properties cannot co-exist in a design.
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cts-gpios: true
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rts-gpios: true
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wakeup-source: true
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rs485-rts-delay: true
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rs485-rts-active-low: true
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linux,rs485-enabled-at-boot-time: true
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rs485-rx-during-tx: true
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rx-threshold:
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description:
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If value is set to 1, RX FIFO threshold is disabled.
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enum: [1, 2, 4, 8, 12, 14, 16]
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default: 8
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tx-threshold:
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description:
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If value is set to 1, TX FIFO threshold is disabled.
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enum: [1, 2, 4, 8, 12, 14, 16]
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default: 8
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allOf:
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- $ref: rs485.yaml#
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- $ref: serial.yaml#
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- if:
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required:
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- st,hw-flow-ctrl
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then:
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properties:
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cts-gpios: false
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rts-gpios: false
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- if:
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properties:
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compatible:
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const: st,stm32-uart
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then:
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properties:
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rx-tx-swap: false
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- if:
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properties:
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compatible:
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contains:
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enum:
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- st,stm32-uart
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- st,stm32f7-uart
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then:
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properties:
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rx-threshold: false
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tx-threshold: false
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required:
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- compatible
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- reg
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- interrupts
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- clocks
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unevaluatedProperties: false
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examples:
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- |
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#include <dt-bindings/clock/stm32mp1-clks.h>
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usart1: serial@40011000 {
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compatible = "st,stm32h7-uart";
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reg = <0x40011000 0x400>;
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interrupts = <37>;
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clocks = <&rcc 0 164>;
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dmas = <&dma2 2 4 0x414 0x0>,
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<&dma2 7 4 0x414 0x0>;
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dma-names = "rx", "tx";
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rx-threshold = <4>;
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tx-threshold = <4>;
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rs485-rts-active-low;
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};
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...
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