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
8 title: Amlogic Meson SoC UART Serial Interface
9
10 maintainers:
11 - Neil Armstrong <neil.armstrong@linaro.org>
12
13 description: |
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
22 allOf:
23 - $ref: serial.yaml#
24
25 properties:
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
85 required:
86 - compatible
87 - reg
88 - interrupts
89 - clocks
90 - clock-names
91
92 unevaluatedProperties: false
93
94 examples:
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 };
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