1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
2 # Copyright 2019 BayLibre, SAS
5 $id: http://devicetree.org/schemas/serial/amlogic,meson-uart.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
8 title: Amlogic Meson SoC UART Serial Interface
11 - Neil Armstrong <neil.armstrong@linaro.org>
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.
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.
28 - description: Always-on power domain UART controller
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
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
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
53 - const: amlogic,meson-g12a-uart
54 - const: amlogic,meson-gx-uart
55 - description: UART controller on S4 compatible SoCs
57 - const: amlogic,t7-uart
58 - const: amlogic,meson-s4-uart
68 - description: external xtal clock identifier
69 - description: the bus core clock, either the clk81 clock or the gate clock
70 - description: the source of the baudrate generator, can be either the xtal or the pclk
79 description: The fifo size supported by the UART channel.
80 $ref: /schemas/types.yaml#/definitions/uint32
90 unevaluatedProperties: false
95 compatible = "amlogic,meson-gx-uart";
98 clocks = <&xtal>, <&pclk>, <&xtal>;
99 clock-names = "xtal", "pclk", "baud";