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|
# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/serial/pl011.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: ARM AMBA Primecell PL011 serial UART
maintainers:
- Rob Herring <robh@kernel.org>
allOf:
- $ref: serial.yaml#
# Need a custom select here or 'arm,primecell' will match on lots of nodes
select:
properties:
compatible:
contains:
enum:
- arm,pl011
required:
- compatible
properties:
compatible:
items:
- const: arm,pl011
- const: arm,primecell
reg:
maxItems: 1
interrupts:
maxItems: 1
pinctrl-0: true
pinctrl-1: true
pinctrl-names:
description:
When present, must have one state named "default",
and may contain a second name named "sleep". The former
state sets up pins for ordinary operation whereas
the latter state will put the associated pins to sleep
when the UART is unused
minItems: 1
items:
- const: default
- const: sleep
clocks:
description:
When present, the first clock listed must correspond to
the clock named UARTCLK on the IP block, i.e. the clock
to the external serial line, whereas the second clock
must correspond to the PCLK clocking the internal logic
of the block. Just listing one clock (the first one) is
deprecated.
maxItems: 2
clock-names:
items:
- const: uartclk
- const: apb_pclk
dmas:
minItems: 1
maxItems: 2
dma-names:
minItems: 1
items:
- const: rx
- const: tx
auto-poll:
description:
Enables polling when using RX DMA.
type: boolean
poll-rate-ms:
description:
Rate at which poll occurs when auto-poll is set.
default 100ms.
default: 100
poll-timeout-ms:
description:
Poll timeout when auto-poll is set, default
3000ms.
default: 3000
resets:
maxItems: 1
required:
- compatible
- reg
- interrupts
dependencies:
poll-rate-ms: [ auto-poll ]
poll-timeout-ms: [ auto-poll ]
unevaluatedProperties: false
examples:
- |
serial@80120000 {
compatible = "arm,pl011", "arm,primecell";
reg = <0x80120000 0x1000>;
interrupts = <0 11 4>;
dmas = <&dma 13 0 0x2>, <&dma 13 0 0x0>;
dma-names = "rx", "tx";
clocks = <&foo_clk>, <&bar_clk>;
clock-names = "uartclk", "apb_pclk";
};
...
|
