Documentation/devicetree/bindings/serial/samsung_uart.yaml

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

title: Samsung S3C, S5P, Exynos, and S5L (Apple SoC) SoC UART Controller

maintainers:
  - Krzysztof Kozlowski <krzk@kernel.org>
  - Greg Kroah-Hartman <gregkh@linuxfoundation.org>

description: |+
  Each Samsung UART should have an alias correctly numbered in the "aliases"
  node, according to serialN format, where N is the port number (non-negative
  decimal integer) as specified by User's Manual of respective SoC.

properties:
  compatible:
    oneOf:
      - items:
          - const: samsung,exynosautov9-uart
          - const: samsung,exynos850-uart
      - enum:
          - apple,s5l-uart
          - axis,artpec8-uart
          - samsung,s3c2410-uart
          - samsung,s3c2412-uart
          - samsung,s3c2440-uart
          - samsung,s3c6400-uart
          - samsung,s5pv210-uart
          - samsung,exynos4210-uart
          - samsung,exynos5433-uart
          - samsung,exynos850-uart

  reg:
    maxItems: 1

  reg-io-width:
    description: |
      The size (in bytes) of the IO accesses that should be performed
      on the device.
    enum: [ 1, 4 ]

  clocks:
    minItems: 2
    maxItems: 5

  clock-names:
    description: N = 0 is allowed for SoCs without internal baud clock mux.
    minItems: 2
    items:
      - const: uart
      - pattern: '^clk_uart_baud[0-3]$'
      - pattern: '^clk_uart_baud[0-3]$'
      - pattern: '^clk_uart_baud[0-3]$'
      - pattern: '^clk_uart_baud[0-3]$'

  dmas:
    items:
      - description: DMA controller phandle and request line for RX
      - description: DMA controller phandle and request line for TX

  dma-names:
    items:
      - const: rx
      - const: tx

  interrupts:
    description: RX interrupt and optionally TX interrupt.
    minItems: 1
    maxItems: 2

  power-domains:
    maxItems: 1

  samsung,uart-fifosize:
    description: The fifo size supported by the UART channel.
    $ref: /schemas/types.yaml#/definitions/uint32
    enum: [16, 64, 256]

required:
  - compatible
  - clocks
  - clock-names
  - interrupts
  - reg

unevaluatedProperties: false

allOf:
  - $ref: serial.yaml#

  - if:
      properties:
        compatible:
          contains:
            enum:
              - samsung,s3c2410-uart
              - samsung,s5pv210-uart
    then:
      properties:
        clocks:
          minItems: 2
          maxItems: 3
        clock-names:
          minItems: 2
          items:
            - const: uart
            - pattern: '^clk_uart_baud[0-1]$'
            - pattern: '^clk_uart_baud[0-1]$'

  - if:
      properties:
        compatible:
          contains:
            enum:
              - apple,s5l-uart
              - axis,artpec8-uart
              - samsung,exynos4210-uart
              - samsung,exynos5433-uart
    then:
      properties:
        clocks:
          maxItems: 2
        clock-names:
          items:
            - const: uart
            - const: clk_uart_baud0

examples:
  - |
    #include <dt-bindings/clock/samsung,s3c64xx-clock.h>

    uart0: serial@7f005000 {
        compatible = "samsung,s3c6400-uart";
        reg = <0x7f005000 0x100>;
        interrupt-parent = <&vic1>;
        interrupts = <5>;
        clock-names = "uart", "clk_uart_baud2",
                      "clk_uart_baud3";
        clocks = <&clocks PCLK_UART0>, <&clocks PCLK_UART0>,
                 <&clocks SCLK_UART>;
        samsung,uart-fifosize = <16>;
    };