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