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: 11*c6a43fb3SNeil 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 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 3234de6666SXianwei Zhao - amlogic,meson-s4-uart 334df7e9a1SNeil Armstrong - const: amlogic,meson-ao-uart 344df7e9a1SNeil Armstrong - description: Everything-Else power domain UART controller 354df7e9a1SNeil Armstrong enum: 364df7e9a1SNeil Armstrong - amlogic,meson6-uart 374df7e9a1SNeil Armstrong - amlogic,meson8-uart 384df7e9a1SNeil Armstrong - amlogic,meson8b-uart 394df7e9a1SNeil Armstrong - amlogic,meson-gx-uart 4034de6666SXianwei Zhao - amlogic,meson-s4-uart 414df7e9a1SNeil Armstrong 424df7e9a1SNeil Armstrong reg: 434df7e9a1SNeil Armstrong maxItems: 1 444df7e9a1SNeil Armstrong 454df7e9a1SNeil Armstrong interrupts: 464df7e9a1SNeil Armstrong maxItems: 1 474df7e9a1SNeil Armstrong 484df7e9a1SNeil Armstrong clocks: 494df7e9a1SNeil Armstrong items: 504df7e9a1SNeil Armstrong - description: external xtal clock identifier 514df7e9a1SNeil Armstrong - description: the bus core clock, either the clk81 clock or the gate clock 524df7e9a1SNeil Armstrong - description: the source of the baudrate generator, can be either the xtal or the pclk 534df7e9a1SNeil Armstrong 544df7e9a1SNeil Armstrong clock-names: 554df7e9a1SNeil Armstrong items: 564df7e9a1SNeil Armstrong - const: xtal 574df7e9a1SNeil Armstrong - const: pclk 584df7e9a1SNeil Armstrong - const: baud 594df7e9a1SNeil Armstrong 60f985b0b6SNeil Armstrong fifo-size: 61f985b0b6SNeil Armstrong description: The fifo size supported by the UART channel. 62f985b0b6SNeil Armstrong $ref: /schemas/types.yaml#/definitions/uint32 63f985b0b6SNeil Armstrong enum: [64, 128] 64f985b0b6SNeil Armstrong 654df7e9a1SNeil Armstrongrequired: 664df7e9a1SNeil Armstrong - compatible 674df7e9a1SNeil Armstrong - reg 684df7e9a1SNeil Armstrong - interrupts 694df7e9a1SNeil Armstrong - clocks 704df7e9a1SNeil Armstrong - clock-names 714df7e9a1SNeil Armstrong 727f464532SRob HerringadditionalProperties: false 737f464532SRob Herring 744df7e9a1SNeil Armstrongexamples: 754df7e9a1SNeil Armstrong - | 764df7e9a1SNeil Armstrong serial@84c0 { 774df7e9a1SNeil Armstrong compatible = "amlogic,meson-gx-uart"; 784df7e9a1SNeil Armstrong reg = <0x84c0 0x14>; 794df7e9a1SNeil Armstrong interrupts = <26>; 804df7e9a1SNeil Armstrong clocks = <&xtal>, <&pclk>, <&xtal>; 814df7e9a1SNeil Armstrong clock-names = "xtal", "pclk", "baud"; 824df7e9a1SNeil Armstrong }; 83