0001 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
0002 # Copyright 2019 BayLibre, SAS
0003 %YAML 1.2
0004 ---
0005 $id: "http://devicetree.org/schemas/serial/amlogic,meson-uart.yaml#"
0006 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
0007
0008 title: Amlogic Meson SoC UART Serial Interface
0009
0010 maintainers:
0011 - Neil Armstrong <neil.armstrong@linaro.org>
0012
0013 description: |
0014 The Amlogic Meson SoC UART Serial Interface is present on a large range
0015 of SoCs, and can be present either in the "Always-On" power domain or the
0016 "Everything-Else" power domain.
0017
0018 The particularity of the "Always-On" Serial Interface is that the hardware
0019 is active since power-on and does not need any clock gating and is usable
0020 as very early serial console.
0021
0022 properties:
0023 compatible:
0024 oneOf:
0025 - description: Always-on power domain UART controller
0026 items:
0027 - enum:
0028 - amlogic,meson6-uart
0029 - amlogic,meson8-uart
0030 - amlogic,meson8b-uart
0031 - amlogic,meson-gx-uart
0032 - amlogic,meson-s4-uart
0033 - const: amlogic,meson-ao-uart
0034 - description: Everything-Else power domain UART controller
0035 enum:
0036 - amlogic,meson6-uart
0037 - amlogic,meson8-uart
0038 - amlogic,meson8b-uart
0039 - amlogic,meson-gx-uart
0040 - amlogic,meson-s4-uart
0041
0042 reg:
0043 maxItems: 1
0044
0045 interrupts:
0046 maxItems: 1
0047
0048 clocks:
0049 items:
0050 - description: external xtal clock identifier
0051 - description: the bus core clock, either the clk81 clock or the gate clock
0052 - description: the source of the baudrate generator, can be either the xtal or the pclk
0053
0054 clock-names:
0055 items:
0056 - const: xtal
0057 - const: pclk
0058 - const: baud
0059
0060 fifo-size:
0061 description: The fifo size supported by the UART channel.
0062 $ref: /schemas/types.yaml#/definitions/uint32
0063 enum: [64, 128]
0064
0065 required:
0066 - compatible
0067 - reg
0068 - interrupts
0069 - clocks
0070 - clock-names
0071
0072 additionalProperties: false
0073
0074 examples:
0075 - |
0076 serial@84c0 {
0077 compatible = "amlogic,meson-gx-uart";
0078 reg = <0x84c0 0x14>;
0079 interrupts = <26>;
0080 clocks = <&xtal>, <&pclk>, <&xtal>;
0081 clock-names = "xtal", "pclk", "baud";
0082 };
