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 properties:
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 - amlogic,meson-s4-uart
33 - const: amlogic,meson-ao-uart
34 - description: Everything-Else power domain UART controller
35 enum:
36 - amlogic,meson6-uart
37 - amlogic,meson8-uart
38 - amlogic,meson8b-uart
39 - amlogic,meson-gx-uart
40 - amlogic,meson-s4-uart
41
42 reg:
43 maxItems: 1
44
45 interrupts:
46 maxItems: 1
47
48 clocks:
49 items:
50 - description: external xtal clock identifier
51 - description: the bus core clock, either the clk81 clock or the gate clock
52 - description: the source of the baudrate generator, can be either the xtal or the pclk
53
54 clock-names:
55 items:
56 - const: xtal
57 - const: pclk
58 - const: baud
59
60 fifo-size:
61 description: The fifo size supported by the UART channel.
62 $ref: /schemas/types.yaml#/definitions/uint32
63 enum: [64, 128]
64
65 required:
66 - compatible
67 - reg
68 - interrupts
69 - clocks
70 - clock-names
71
72 additionalProperties: false
73
74 examples:
75 - |
76 serial@84c0 {
77 compatible = "amlogic,meson-gx-uart";
78 reg = <0x84c0 0x14>;
79 interrupts = <26>;
80 clocks = <&xtal>, <&pclk>, <&xtal>;
81 clock-names = "xtal", "pclk", "baud";
82 };
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