amlogic,meson-uart.yaml (2206B)
1# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) 2# Copyright 2019 BayLibre, SAS 3%YAML 1.2 4--- 5$id: "http://devicetree.org/schemas/serial/amlogic,meson-uart.yaml#" 6$schema: "http://devicetree.org/meta-schemas/core.yaml#" 7 8title: Amlogic Meson SoC UART Serial Interface 9 10maintainers: 11 - Neil Armstrong <narmstrong@baylibre.com> 12 13description: | 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. 17 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. 21 22properties: 23 compatible: 24 oneOf: 25 - description: Always-on power domain UART controller 26 items: 27 - enum: 28 - amlogic,meson6-uart 29 - amlogic,meson8-uart 30 - amlogic,meson8b-uart 31 - amlogic,meson-gx-uart 32 - amlogic,meson-s4-uart 33 - const: amlogic,meson-ao-uart 34 - description: Everything-Else power domain UART controller 35 enum: 36 - amlogic,meson6-uart 37 - amlogic,meson8-uart 38 - amlogic,meson8b-uart 39 - amlogic,meson-gx-uart 40 - amlogic,meson-s4-uart 41 42 reg: 43 maxItems: 1 44 45 interrupts: 46 maxItems: 1 47 48 clocks: 49 items: 50 - description: external xtal clock identifier 51 - description: the bus core clock, either the clk81 clock or the gate clock 52 - description: the source of the baudrate generator, can be either the xtal or the pclk 53 54 clock-names: 55 items: 56 - const: xtal 57 - const: pclk 58 - const: baud 59 60 fifo-size: 61 description: The fifo size supported by the UART channel. 62 $ref: /schemas/types.yaml#/definitions/uint32 63 enum: [64, 128] 64 65required: 66 - compatible 67 - reg 68 - interrupts 69 - clocks 70 - clock-names 71 72additionalProperties: false 73 74examples: 75 - | 76 serial@84c0 { 77 compatible = "amlogic,meson-gx-uart"; 78 reg = <0x84c0 0x14>; 79 interrupts = <26>; 80 clocks = <&xtal>, <&pclk>, <&xtal>; 81 clock-names = "xtal", "pclk", "baud"; 82 };