# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) # Copyright 2019 BayLibre, SAS %YAML 1.2 --- $id: "http://devicetree.org/schemas/serial/amlogic,meson-uart.yaml#" $schema: "http://devicetree.org/meta-schemas/core.yaml#" title: Amlogic Meson SoC UART Serial Interface maintainers: - Neil Armstrong description: | The Amlogic Meson SoC UART Serial Interface is present on a large range of SoCs, and can be present either in the "Always-On" power domain or the "Everything-Else" power domain. The particularity of the "Always-On" Serial Interface is that the hardware is active since power-on and does not need any clock gating and is usable as very early serial console. properties: compatible: oneOf: - description: Always-on power domain UART controller items: - enum: - amlogic,meson6-uart - amlogic,meson8-uart - amlogic,meson8b-uart - amlogic,meson-gx-uart - const: amlogic,meson-ao-uart - description: Everything-Else power domain UART controller enum: - amlogic,meson6-uart - amlogic,meson8-uart - amlogic,meson8b-uart - amlogic,meson-gx-uart reg: maxItems: 1 interrupts: maxItems: 1 clocks: items: - description: external xtal clock identifier - description: the bus core clock, either the clk81 clock or the gate clock - description: the source of the baudrate generator, can be either the xtal or the pclk clock-names: items: - const: xtal - const: pclk - const: baud required: - compatible - reg - interrupts - clocks - clock-names examples: - | serial@84c0 { compatible = "amlogic,meson-gx-uart"; reg = <0x84c0 0x14>; interrupts = <26>; clocks = <&xtal>, <&pclk>, <&xtal>; clock-names = "xtal", "pclk", "baud"; };