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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
# Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries
%YAML 1.2
---
$id: http://devicetree.org/schemas/serial/atmel,at91-usart.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART)
maintainers:
- Richard Genoud <richard.genoud@gmail.com>
properties:
compatible:
oneOf:
- enum:
- atmel,at91rm9200-usart
- atmel,at91sam9260-usart
- microchip,sam9x60-usart
- items:
- const: atmel,at91rm9200-dbgu
- const: atmel,at91rm9200-usart
- items:
- const: atmel,at91sam9260-dbgu
- const: atmel,at91sam9260-usart
- items:
- const: microchip,sam9x60-dbgu
- const: microchip,sam9x60-usart
- const: atmel,at91sam9260-dbgu
- const: atmel,at91sam9260-usart
reg:
maxItems: 1
interrupts:
maxItems: 1
clock-names:
minItems: 1
items:
- const: usart
- const: gclk
clocks:
minItems: 1
items:
- description: USART Peripheral Clock
- description: USART Generic Clock
dmas:
items:
- description: TX DMA Channel
- description: RX DMA Channel
dma-names:
items:
- const: tx
- const: rx
atmel,usart-mode:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Must be either <AT91_USART_MODE_SPI> for SPI or
<AT91_USART_MODE_SERIAL> for USART (found in dt-bindings/mfd/at91-usart.h).
enum: [ 0, 1 ]
atmel,use-dma-rx:
type: boolean
description: use of PDC or DMA for receiving data
atmel,use-dma-tx:
type: boolean
description: use of PDC or DMA for transmitting data
atmel,fifo-size:
$ref: /schemas/types.yaml#/definitions/uint32
description:
Maximum number of data the RX and TX FIFOs can store for FIFO
capable USARTS.
enum: [ 16, 32 ]
required:
- compatible
- reg
- interrupts
- clock-names
- clocks
- atmel,usart-mode
allOf:
- if:
properties:
atmel,usart-mode:
const: 1
then:
allOf:
- $ref: /schemas/spi/spi-controller.yaml#
properties:
atmel,use-dma-rx: false
atmel,use-dma-tx: false
atmel,fifo-size: false
"#size-cells":
const: 0
"#address-cells":
const: 1
required:
- "#size-cells"
- "#address-cells"
else:
allOf:
- $ref: /schemas/serial/serial.yaml#
- $ref: /schemas/serial/rs485.yaml#
unevaluatedProperties: false
examples:
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/mfd/at91-usart.h>
#include <dt-bindings/dma/at91.h>
/* use PDC */
usart0: serial@fff8c000 {
compatible = "atmel,at91sam9260-usart";
reg = <0xfff8c000 0x4000>;
atmel,usart-mode = <AT91_USART_MODE_SERIAL>;
interrupts = <7>;
clocks = <&usart0_clk>;
clock-names = "usart";
atmel,use-dma-rx;
atmel,use-dma-tx;
rts-gpios = <&pioD 15 GPIO_ACTIVE_LOW>;
cts-gpios = <&pioD 16 GPIO_ACTIVE_LOW>;
dtr-gpios = <&pioD 17 GPIO_ACTIVE_LOW>;
dsr-gpios = <&pioD 18 GPIO_ACTIVE_LOW>;
dcd-gpios = <&pioD 20 GPIO_ACTIVE_LOW>;
rng-gpios = <&pioD 19 GPIO_ACTIVE_LOW>;
};
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/mfd/at91-usart.h>
#include <dt-bindings/dma/at91.h>
/* use DMA */
usart1: serial@f001c000 {
compatible = "atmel,at91sam9260-usart";
reg = <0xf001c000 0x100>;
atmel,usart-mode = <AT91_USART_MODE_SERIAL>;
interrupts = <12 IRQ_TYPE_LEVEL_HIGH 5>;
clocks = <&usart0_clk>;
clock-names = "usart";
atmel,use-dma-rx;
atmel,use-dma-tx;
dmas = <&dma0 2 AT91_DMA_CFG_PER_ID(3)>,
<&dma0 2 (AT91_DMA_CFG_PER_ID(4) | AT91_DMA_CFG_FIFOCFG_ASAP)>;
dma-names = "tx", "rx";
atmel,fifo-size = <32>;
};
- |
#include <dt-bindings/gpio/gpio.h>
#include <dt-bindings/interrupt-controller/irq.h>
#include <dt-bindings/mfd/at91-usart.h>
#include <dt-bindings/dma/at91.h>
/* SPI mode */
spi0: spi@f001c000 {
compatible = "atmel,at91sam9260-usart";
reg = <0xf001c000 0x100>;
#address-cells = <1>;
#size-cells = <0>;
atmel,usart-mode = <AT91_USART_MODE_SPI>;
interrupts = <12 IRQ_TYPE_LEVEL_HIGH 5>;
clocks = <&usart0_clk>;
clock-names = "usart";
dmas = <&dma0 2 AT91_DMA_CFG_PER_ID(3)>,
<&dma0 2 (AT91_DMA_CFG_PER_ID(4) | AT91_DMA_CFG_FIFOCFG_ASAP)>;
dma-names = "tx", "rx";
cs-gpios = <&pioB 3 GPIO_ACTIVE_HIGH>;
};
|
