xref: /linux/Documentation/devicetree/bindings/serial/pl011.yaml (revision 48dea9a700c8728cc31a1dd44588b97578de86ee) 
1# SPDX-License-Identifier: GPL-2.0
2%YAML 1.2
3---
4$id: http://devicetree.org/schemas/serial/pl011.yaml#
5$schema: http://devicetree.org/meta-schemas/core.yaml#
6
7title: ARM AMBA Primecell PL011 serial UART
8
9maintainers:
10  - Rob Herring <robh@kernel.org>
11
12allOf:
13  - $ref: /schemas/serial.yaml#
14
15# Need a custom select here or 'arm,primecell' will match on lots of nodes
16select:
17  properties:
18    compatible:
19      contains:
20        enum:
21          - arm,pl011
22          - zte,zx296702-uart
23  required:
24    - compatible
25
26properties:
27  compatible:
28    oneOf:
29      - items:
30          - const: arm,pl011
31          - const: arm,primecell
32      - items:
33          - const: zte,zx296702-uart
34          - const: arm,primecell
35
36  reg:
37    maxItems: 1
38
39  interrupts:
40    maxItems: 1
41
42  pinctrl-0: true
43  pinctrl-1: true
44
45  pinctrl-names:
46    description:
47      When present, must have one state named "default",
48      and may contain a second name named "sleep". The former
49      state sets up pins for ordinary operation whereas
50      the latter state will put the associated pins to sleep
51      when the UART is unused
52    minItems: 1
53    items:
54      - const: default
55      - const: sleep
56
57  clocks:
58    description:
59      When present, the first clock listed must correspond to
60      the clock named UARTCLK on the IP block, i.e. the clock
61      to the external serial line, whereas the second clock
62      must correspond to the PCLK clocking the internal logic
63      of the block. Just listing one clock (the first one) is
64      deprecated.
65    maxItems: 2
66
67  clock-names:
68    items:
69      - const: uartclk
70      - const: apb_pclk
71
72  dmas:
73    minItems: 1
74    maxItems: 2
75
76  dma-names:
77    minItems: 1
78    items:
79      - const: rx
80      - const: tx
81
82  auto-poll:
83    description:
84      Enables polling when using RX DMA.
85    type: boolean
86
87  poll-rate-ms:
88    description:
89      Rate at which poll occurs when auto-poll is set.
90      default 100ms.
91    $ref: /schemas/types.yaml#/definitions/uint32
92    default: 100
93
94  poll-timeout-ms:
95    description:
96      Poll timeout when auto-poll is set, default
97      3000ms.
98    $ref: /schemas/types.yaml#/definitions/uint32
99    default: 3000
100
101required:
102  - compatible
103  - reg
104  - interrupts
105
106dependencies:
107  poll-rate-ms: [ auto-poll ]
108  poll-timeout-ms: [ auto-poll ]
109
110additionalProperties: false
111
112examples:
113  - |
114    serial@80120000 {
115      compatible = "arm,pl011", "arm,primecell";
116      reg = <0x80120000 0x1000>;
117      interrupts = <0 11 4>;
118      dmas = <&dma 13 0 0x2>, <&dma 13 0 0x0>;
119      dma-names = "rx", "tx";
120      clocks = <&foo_clk>, <&bar_clk>;
121      clock-names = "uartclk", "apb_pclk";
122    };
123
124...
125