xref: /linux/Documentation/devicetree/bindings/serial/amlogic,meson-uart.yaml (revision 001821b0e79716c4e17c71d8e053a23599a7a508) 
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 <neil.armstrong@linaro.org>
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
22allOf:
23  - $ref: serial.yaml#
24
25properties:
26  compatible:
27    oneOf:
28      - description: Always-on power domain UART controller
29        items:
30          - enum:
31              - amlogic,meson6-uart
32              - amlogic,meson8-uart
33              - amlogic,meson8b-uart
34              - amlogic,meson-gx-uart
35              - amlogic,meson-s4-uart
36              - amlogic,meson-a1-uart
37          - const: amlogic,meson-ao-uart
38      - description: Always-on power domain UART controller on G12A SoCs
39        items:
40          - const: amlogic,meson-g12a-uart
41          - const: amlogic,meson-gx-uart
42          - const: amlogic,meson-ao-uart
43      - description: Everything-Else power domain UART controller
44        enum:
45          - amlogic,meson6-uart
46          - amlogic,meson8-uart
47          - amlogic,meson8b-uart
48          - amlogic,meson-gx-uart
49          - amlogic,meson-s4-uart
50          - amlogic,meson-a1-uart
51      - description: Everything-Else power domain UART controller on G12A SoCs
52        items:
53          - const: amlogic,meson-g12a-uart
54          - const: amlogic,meson-gx-uart
55      - description: UART controller on S4 compatible SoCs
56        items:
57          - enum:
58              - amlogic,a4-uart
59              - amlogic,t7-uart
60          - const: amlogic,meson-s4-uart
61
62  reg:
63    maxItems: 1
64
65  interrupts:
66    maxItems: 1
67
68  clocks:
69    items:
70      - description: external xtal clock identifier
71      - description: the bus core clock, either the clk81 clock or the gate clock
72      - description: the source of the baudrate generator, can be either the xtal or the pclk
73
74  clock-names:
75    items:
76      - const: xtal
77      - const: pclk
78      - const: baud
79
80  fifo-size:
81    description: The fifo size supported by the UART channel.
82    $ref: /schemas/types.yaml#/definitions/uint32
83    enum: [64, 128]
84
85required:
86  - compatible
87  - reg
88  - interrupts
89  - clocks
90  - clock-names
91
92unevaluatedProperties: false
93
94examples:
95  - |
96    serial@84c0 {
97        compatible = "amlogic,meson-gx-uart";
98        reg = <0x84c0 0x14>;
99        interrupts = <26>;
100        clocks = <&xtal>, <&pclk>, <&xtal>;
101        clock-names = "xtal", "pclk", "baud";
102    };
103