xref: /freebsd/sys/contrib/device-tree/Bindings/serial/amlogic,meson-uart.yaml (revision 43a5ec4eb41567cc92586503212743d89686d78f) 
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2# Copyright 2019 BayLibre, SAS
3%YAML 1.2
4---
5$id: "http://devicetree.org/schemas/serial/amlogic,meson-uart.yaml#"
6$schema: "http://devicetree.org/meta-schemas/core.yaml#"
7
8title: Amlogic Meson SoC UART Serial Interface
9
10maintainers:
11  - Neil Armstrong <narmstrong@baylibre.com>
12
13description: |
14  The Amlogic Meson SoC UART Serial Interface is present on a large range
15  of SoCs, and can be present either in the "Always-On" power domain or the
16  "Everything-Else" power domain.
17
18  The particularity of the "Always-On" Serial Interface is that the hardware
19  is active since power-on and does not need any clock gating and is usable
20  as very early serial console.
21
22properties:
23  compatible:
24    oneOf:
25      - description: Always-on power domain UART controller
26        items:
27          - enum:
28              - amlogic,meson6-uart
29              - amlogic,meson8-uart
30              - amlogic,meson8b-uart
31              - amlogic,meson-gx-uart
32          - const: amlogic,meson-ao-uart
33      - description: Everything-Else power domain UART controller
34        enum:
35          - amlogic,meson6-uart
36          - amlogic,meson8-uart
37          - amlogic,meson8b-uart
38          - amlogic,meson-gx-uart
39
40  reg:
41    maxItems: 1
42
43  interrupts:
44    maxItems: 1
45
46  clocks:
47    items:
48      - description: external xtal clock identifier
49      - description: the bus core clock, either the clk81 clock or the gate clock
50      - description: the source of the baudrate generator, can be either the xtal or the pclk
51
52  clock-names:
53    items:
54      - const: xtal
55      - const: pclk
56      - const: baud
57
58required:
59  - compatible
60  - reg
61  - interrupts
62  - clocks
63  - clock-names
64
65additionalProperties: false
66
67examples:
68  - |
69    serial@84c0 {
70          compatible = "amlogic,meson-gx-uart";
71          reg = <0x84c0 0x14>;
72          interrupts = <26>;
73          clocks = <&xtal>, <&pclk>, <&xtal>;
74          clock-names = "xtal", "pclk", "baud";
75    };
76