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: 114df7e9a1SNeil Armstrong - Neil Armstrong <narmstrong@baylibre.com> 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 224df7e9a1SNeil Armstrongproperties: 234df7e9a1SNeil Armstrong compatible: 244df7e9a1SNeil Armstrong oneOf: 254df7e9a1SNeil Armstrong - description: Always-on power domain UART controller 264df7e9a1SNeil Armstrong items: 274df7e9a1SNeil Armstrong - enum: 284df7e9a1SNeil Armstrong - amlogic,meson6-uart 294df7e9a1SNeil Armstrong - amlogic,meson8-uart 304df7e9a1SNeil Armstrong - amlogic,meson8b-uart 314df7e9a1SNeil Armstrong - amlogic,meson-gx-uart 324df7e9a1SNeil Armstrong - const: amlogic,meson-ao-uart 334df7e9a1SNeil Armstrong - description: Everything-Else power domain UART controller 344df7e9a1SNeil Armstrong enum: 354df7e9a1SNeil Armstrong - amlogic,meson6-uart 364df7e9a1SNeil Armstrong - amlogic,meson8-uart 374df7e9a1SNeil Armstrong - amlogic,meson8b-uart 384df7e9a1SNeil Armstrong - amlogic,meson-gx-uart 394df7e9a1SNeil Armstrong 404df7e9a1SNeil Armstrong reg: 414df7e9a1SNeil Armstrong maxItems: 1 424df7e9a1SNeil Armstrong 434df7e9a1SNeil Armstrong interrupts: 444df7e9a1SNeil Armstrong maxItems: 1 454df7e9a1SNeil Armstrong 464df7e9a1SNeil Armstrong clocks: 474df7e9a1SNeil Armstrong items: 484df7e9a1SNeil Armstrong - description: external xtal clock identifier 494df7e9a1SNeil Armstrong - description: the bus core clock, either the clk81 clock or the gate clock 504df7e9a1SNeil Armstrong - description: the source of the baudrate generator, can be either the xtal or the pclk 514df7e9a1SNeil Armstrong 524df7e9a1SNeil Armstrong clock-names: 534df7e9a1SNeil Armstrong items: 544df7e9a1SNeil Armstrong - const: xtal 554df7e9a1SNeil Armstrong - const: pclk 564df7e9a1SNeil Armstrong - const: baud 574df7e9a1SNeil Armstrong 584df7e9a1SNeil Armstrongrequired: 594df7e9a1SNeil Armstrong - compatible 604df7e9a1SNeil Armstrong - reg 614df7e9a1SNeil Armstrong - interrupts 624df7e9a1SNeil Armstrong - clocks 634df7e9a1SNeil Armstrong - clock-names 644df7e9a1SNeil Armstrong 657f464532SRob HerringadditionalProperties: false 667f464532SRob Herring 674df7e9a1SNeil Armstrongexamples: 684df7e9a1SNeil Armstrong - | 694df7e9a1SNeil Armstrong serial@84c0 { 704df7e9a1SNeil Armstrong compatible = "amlogic,meson-gx-uart"; 714df7e9a1SNeil Armstrong reg = <0x84c0 0x14>; 724df7e9a1SNeil Armstrong interrupts = <26>; 734df7e9a1SNeil Armstrong clocks = <&xtal>, <&pclk>, <&xtal>; 744df7e9a1SNeil Armstrong clock-names = "xtal", "pclk", "baud"; 754df7e9a1SNeil Armstrong }; 76