14df7e9a1SNeil Armstrong# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) 24df7e9a1SNeil Armstrong# Copyright 2019 BayLibre, SAS 34df7e9a1SNeil Armstrong%YAML 1.2 44df7e9a1SNeil Armstrong--- 54df7e9a1SNeil Armstrong$id: "http://devicetree.org/schemas/serial/amlogic,meson-uart.yaml#" 64df7e9a1SNeil Armstrong$schema: "http://devicetree.org/meta-schemas/core.yaml#" 74df7e9a1SNeil Armstrong 84df7e9a1SNeil Armstrongtitle: Amlogic Meson SoC UART Serial Interface 94df7e9a1SNeil Armstrong 104df7e9a1SNeil Armstrongmaintainers: 11c6a43fb3SNeil Armstrong - Neil Armstrong <neil.armstrong@linaro.org> 124df7e9a1SNeil Armstrong 134df7e9a1SNeil Armstrongdescription: | 144df7e9a1SNeil Armstrong The Amlogic Meson SoC UART Serial Interface is present on a large range 154df7e9a1SNeil Armstrong of SoCs, and can be present either in the "Always-On" power domain or the 164df7e9a1SNeil Armstrong "Everything-Else" power domain. 174df7e9a1SNeil Armstrong 184df7e9a1SNeil Armstrong The particularity of the "Always-On" Serial Interface is that the hardware 194df7e9a1SNeil Armstrong is active since power-on and does not need any clock gating and is usable 204df7e9a1SNeil Armstrong as very early serial console. 214df7e9a1SNeil Armstrong 224cb07402SKrzysztof KozlowskiallOf: 234cb07402SKrzysztof Kozlowski - $ref: serial.yaml# 244cb07402SKrzysztof Kozlowski 254df7e9a1SNeil Armstrongproperties: 264df7e9a1SNeil Armstrong compatible: 274df7e9a1SNeil Armstrong oneOf: 284df7e9a1SNeil Armstrong - description: Always-on power domain UART controller 294df7e9a1SNeil Armstrong items: 304df7e9a1SNeil Armstrong - enum: 314df7e9a1SNeil Armstrong - amlogic,meson6-uart 324df7e9a1SNeil Armstrong - amlogic,meson8-uart 334df7e9a1SNeil Armstrong - amlogic,meson8b-uart 344df7e9a1SNeil Armstrong - amlogic,meson-gx-uart 3534de6666SXianwei Zhao - amlogic,meson-s4-uart 364df7e9a1SNeil Armstrong - const: amlogic,meson-ao-uart 37*add5dfe8SMartin Blumenstingl - description: Always-on power domain UART controller on G12A SoCs 38*add5dfe8SMartin Blumenstingl items: 39*add5dfe8SMartin Blumenstingl - const: amlogic,meson-g12a-uart 40*add5dfe8SMartin Blumenstingl - const: amlogic,meson-gx-uart 41*add5dfe8SMartin Blumenstingl - const: amlogic,meson-ao-uart 424df7e9a1SNeil Armstrong - description: Everything-Else power domain UART controller 434df7e9a1SNeil Armstrong enum: 444df7e9a1SNeil Armstrong - amlogic,meson6-uart 454df7e9a1SNeil Armstrong - amlogic,meson8-uart 464df7e9a1SNeil Armstrong - amlogic,meson8b-uart 474df7e9a1SNeil Armstrong - amlogic,meson-gx-uart 4834de6666SXianwei Zhao - amlogic,meson-s4-uart 49*add5dfe8SMartin Blumenstingl - description: Everything-Else power domain UART controller on G12A SoCs 50*add5dfe8SMartin Blumenstingl items: 51*add5dfe8SMartin Blumenstingl - const: amlogic,meson-g12a-uart 52*add5dfe8SMartin Blumenstingl - const: amlogic,meson-gx-uart 534df7e9a1SNeil Armstrong 544df7e9a1SNeil Armstrong reg: 554df7e9a1SNeil Armstrong maxItems: 1 564df7e9a1SNeil Armstrong 574df7e9a1SNeil Armstrong interrupts: 584df7e9a1SNeil Armstrong maxItems: 1 594df7e9a1SNeil Armstrong 604df7e9a1SNeil Armstrong clocks: 614df7e9a1SNeil Armstrong items: 624df7e9a1SNeil Armstrong - description: external xtal clock identifier 634df7e9a1SNeil Armstrong - description: the bus core clock, either the clk81 clock or the gate clock 644df7e9a1SNeil Armstrong - description: the source of the baudrate generator, can be either the xtal or the pclk 654df7e9a1SNeil Armstrong 664df7e9a1SNeil Armstrong clock-names: 674df7e9a1SNeil Armstrong items: 684df7e9a1SNeil Armstrong - const: xtal 694df7e9a1SNeil Armstrong - const: pclk 704df7e9a1SNeil Armstrong - const: baud 714df7e9a1SNeil Armstrong 72f985b0b6SNeil Armstrong fifo-size: 73f985b0b6SNeil Armstrong description: The fifo size supported by the UART channel. 74f985b0b6SNeil Armstrong $ref: /schemas/types.yaml#/definitions/uint32 75f985b0b6SNeil Armstrong enum: [64, 128] 76f985b0b6SNeil Armstrong 774df7e9a1SNeil Armstrongrequired: 784df7e9a1SNeil Armstrong - compatible 794df7e9a1SNeil Armstrong - reg 804df7e9a1SNeil Armstrong - interrupts 814df7e9a1SNeil Armstrong - clocks 824df7e9a1SNeil Armstrong - clock-names 834df7e9a1SNeil Armstrong 844cb07402SKrzysztof KozlowskiunevaluatedProperties: false 857f464532SRob Herring 864df7e9a1SNeil Armstrongexamples: 874df7e9a1SNeil Armstrong - | 884df7e9a1SNeil Armstrong serial@84c0 { 894df7e9a1SNeil Armstrong compatible = "amlogic,meson-gx-uart"; 904df7e9a1SNeil Armstrong reg = <0x84c0 0x14>; 914df7e9a1SNeil Armstrong interrupts = <26>; 924df7e9a1SNeil Armstrong clocks = <&xtal>, <&pclk>, <&xtal>; 934df7e9a1SNeil Armstrong clock-names = "xtal", "pclk", "baud"; 944df7e9a1SNeil Armstrong }; 95