xref: /openbmc/linux/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml (revision df230079)

# SPDX-License-Identifier: GPL-2.0
%YAML 1.2
---
$id: http://devicetree.org/schemas/serial/snps-dw-apb-uart.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#

title: Synopsys DesignWare ABP UART

maintainers:
  - Rob Herring <robh@kernel.org>

allOf:
  - $ref: /schemas/serial.yaml#

properties:
  compatible:
    oneOf:
      - items:
          - enum:
              - rockchip,px30-uart
              - rockchip,rk3036-uart
              - rockchip,rk3066-uart
              - rockchip,rk3188-uart
              - rockchip,rk3288-uart
              - rockchip,rk3328-uart
              - rockchip,rk3368-uart
              - rockchip,rk3399-uart
              - rockchip,rv1108-uart
          - const: snps,dw-apb-uart
      - items:
          - enum:
              - brcm,bcm11351-dw-apb-uart
              - brcm,bcm21664-dw-apb-uart
          - const: snps,dw-apb-uart
      - const: snps,dw-apb-uart

  reg:
    maxItems: 1

  interrupts:
    maxItems: 1

  clock-frequency: true

  clocks:
    minItems: 1
    maxItems: 2

  clock-names:
    items:
      - const: baudclk
      - const: apb_pclk

  snps,uart-16550-compatible:
    description: reflects the value of UART_16550_COMPATIBLE configuration
      parameter. Define this if your UART does not implement the busy functionality.
    type: boolean

  resets:
    maxItems: 1

  reg-shift: true

  reg-io-width: true

  dcd-override:
    description: Override the DCD modem status signal. This signal will
      always be reported as active instead of being obtained from the modem
      status register. Define this if your serial port does not use this
      pin.
    type: boolean

  dsr-override:
    description: Override the DTS modem status signal. This signal will
      always be reported as active instead of being obtained from the modem
      status register. Define this if your serial port does not use this
      pin.
    type: boolean

  cts-override:
    description: Override the CTS modem status signal. This signal will
      always be reported as active instead of being obtained from the modem
      status register. Define this if your serial port does not use this
      pin.
    type: boolean

  ri-override:
    description: Override the RI modem status signal. This signal will always
      be reported as inactive instead of being obtained from the modem status
      register. Define this if your serial port does not use this pin.
    type: boolean

required:
  - compatible
  - reg
  - interrupts

examples:
  - |
    serial@80230000 {
      compatible = "snps,dw-apb-uart";
      reg = <0x80230000 0x100>;
      clock-frequency = <3686400>;
      interrupts = <10>;
      reg-shift = <2>;
      reg-io-width = <4>;
      dcd-override;
      dsr-override;
      cts-override;
      ri-override;
    };

  - |
    // Example with one clock:
    serial@80230000 {
      compatible = "snps,dw-apb-uart";
      reg = <0x80230000 0x100>;
      clocks = <&baudclk>;
      interrupts = <10>;
      reg-shift = <2>;
      reg-io-width = <4>;
    };

  - |
    // Example with two clocks:
    serial@80230000 {
      compatible = "snps,dw-apb-uart";
      reg = <0x80230000 0x100>;
      clocks = <&baudclk>, <&apb_pclk>;
      clock-names = "baudclk", "apb_pclk";
      interrupts = <10>;
      reg-shift = <2>;
      reg-io-width = <4>;
    };
...