amlogic,meson-uart.yaml

  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 <neil.armstrong@linaro.org>
 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
 22allOf:
 23  - $ref: serial.yaml#
 24
 25properties:
 26  compatible:
 27    oneOf:
 28      - description: Always-on power domain UART controller
 29        items:
 30          - enum:
 31              - amlogic,meson6-uart
 32              - amlogic,meson8-uart
 33              - amlogic,meson8b-uart
 34              - amlogic,meson-gx-uart
 35              - amlogic,meson-s4-uart
 36              - amlogic,meson-a1-uart
 37          - const: amlogic,meson-ao-uart
 38      - description: Always-on power domain UART controller on G12A SoCs
 39        items:
 40          - const: amlogic,meson-g12a-uart
 41          - const: amlogic,meson-gx-uart
 42          - const: amlogic,meson-ao-uart
 43      - description: Everything-Else power domain UART controller
 44        enum:
 45          - amlogic,meson6-uart
 46          - amlogic,meson8-uart
 47          - amlogic,meson8b-uart
 48          - amlogic,meson-gx-uart
 49          - amlogic,meson-s4-uart
 50          - amlogic,meson-a1-uart
 51      - description: Everything-Else power domain UART controller on G12A SoCs
 52        items:
 53          - const: amlogic,meson-g12a-uart
 54          - const: amlogic,meson-gx-uart
 55      - description: UART controller on S4 compatible SoCs
 56        items:
 57          - enum:
 58              - amlogic,a4-uart
 59              - amlogic,s6-uart
 60              - amlogic,s7-uart
 61              - amlogic,s7d-uart
 62              - amlogic,t7-uart
 63          - const: amlogic,meson-s4-uart
 64
 65  reg:
 66    maxItems: 1
 67
 68  interrupts:
 69    maxItems: 1
 70
 71  clocks:
 72    items:
 73      - description: external xtal clock identifier
 74      - description: the bus core clock, either the clk81 clock or the gate clock
 75      - description: the source of the baudrate generator, can be either the xtal or the pclk
 76
 77  clock-names:
 78    items:
 79      - const: xtal
 80      - const: pclk
 81      - const: baud
 82
 83  fifo-size:
 84    description: The fifo size supported by the UART channel.
 85    $ref: /schemas/types.yaml#/definitions/uint32
 86    enum: [64, 128]
 87
 88required:
 89  - compatible
 90  - reg
 91  - interrupts
 92  - clocks
 93  - clock-names
 94
 95unevaluatedProperties: false
 96
 97examples:
 98  - |
 99    serial@84c0 {
100        compatible = "amlogic,meson-gx-uart";
101        reg = <0x84c0 0x14>;
102        interrupts = <26>;
103        clocks = <&xtal>, <&pclk>, <&xtal>;
104        clock-names = "xtal", "pclk", "baud";
105    };