Documentation/devicetree/bindings/serial/fsl-imx-uart.yaml

   1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/serial/fsl-imx-uart.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: Freescale i.MX Universal Asynchronous Receiver/Transmitter (UART)
   8
   9 maintainers:
  10   - Fabio Estevam <festevam@gmail.com>
  11
  12 allOf:
  13   - $ref: "serial.yaml"
  14   - $ref: "rs485.yaml"
  15
  16 properties:
  17   compatible:
  18     oneOf:
  19       - const: fsl,imx1-uart
  20       - const: fsl,imx21-uart
  21       - items:
  22           - enum:
  23               - fsl,imx25-uart
  24               - fsl,imx27-uart
  25               - fsl,imx31-uart
  26               - fsl,imx35-uart
  27               - fsl,imx50-uart
  28               - fsl,imx51-uart
  29               - fsl,imx53-uart
  30               - fsl,imx6q-uart
  31           - const: fsl,imx21-uart
  32       - items:
  33           - enum:
  34               - fsl,imx6sl-uart
  35               - fsl,imx6sll-uart
  36               - fsl,imx6sx-uart
  37           - const: fsl,imx6q-uart
  38           - const: fsl,imx21-uart
  39       - items:
  40           - enum:
  41               - fsl,imx6ul-uart
  42               - fsl,imx7d-uart
  43               - fsl,imx8mm-uart
  44               - fsl,imx8mn-uart
  45               - fsl,imx8mp-uart
  46               - fsl,imx8mq-uart
  47           - const: fsl,imx6q-uart
  48
  49   reg:
  50     maxItems: 1
  51
  52   interrupts:
  53     maxItems: 1
  54
  55   fsl,dte-mode:
  56     $ref: /schemas/types.yaml#/definitions/flag
  57     description: |
  58       Indicate the uart works in DTE mode. The uart works in DCE mode by default.
  59
  60   fsl,inverted-tx:
  61     $ref: /schemas/types.yaml#/definitions/flag
  62     description: |
  63       Indicate that the hardware attached to the peripheral inverts the signal
  64       transmitted, and that the peripheral should invert its output using the
  65       INVT registers.
  66
  67   fsl,inverted-rx:
  68     $ref: /schemas/types.yaml#/definitions/flag
  69     description: |
  70       Indicate that the hardware attached to the peripheral inverts the signal
  71       received, and that the peripheral should invert its input using the
  72       INVR registers.
  73
  74   fsl,dma-info:
  75     $ref: /schemas/types.yaml#/definitions/uint32-array
  76     minItems: 2
  77     maxItems: 2
  78     description: |
  79       First cell contains the size of DMA buffer chunks, second cell contains
  80       the amount of chunks used for the device. Multiplying both numbers is
  81       the total size of memory used for receiving data.
  82       When not being configured the system will use default settings, which
  83       are sensible for most use cases. If you need low latency processing on
  84       slow connections this needs to be configured appropriately.
  85
  86   uart-has-rtscts: true
  87
  88   rs485-rts-delay: true
  89   rs485-rts-active-low: true
  90   rs485-rx-during-tx: true
  91   linux,rs485-enabled-at-boot-time: true
  92
  93 required:
  94   - compatible
  95   - reg
  96   - interrupts
  97
  98 unevaluatedProperties: false
  99
 100 examples:
 101   - |
 102     aliases {
 103         serial0 = &uart1;
 104     };
 105
 106     uart1: serial@73fbc000 {
 107         compatible = "fsl,imx51-uart", "fsl,imx21-uart";
 108         reg = <0x73fbc000 0x4000>;
 109         interrupts = <31>;
 110         uart-has-rtscts;
 111         fsl,dte-mode;
 112     };