Bindings/serial/pl011.yaml

   1 # SPDX-License-Identifier: GPL-2.0
   2 %YAML 1.2
   3 ---
   4 $id: http://devicetree.org/schemas/serial/pl011.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 title: ARM AMBA Primecell PL011 serial UART
   8
   9 maintainers:
  10   - Rob Herring <robh@kernel.org>
  11
  12 allOf:
  13   - $ref: /schemas/arm/primecell.yaml#
  14   - $ref: serial.yaml#
  15
  16 # Need a custom select here or 'arm,primecell' will match on lots of nodes
  17 select:
  18   properties:
  19     compatible:
  20       contains:
  21         enum:
  22           - arm,pl011
  23   required:
  24     - compatible
  25
  26 properties:
  27   compatible:
  28     items:
  29       - const: arm,pl011
  30       - const: arm,primecell
  31
  32   reg:
  33     maxItems: 1
  34
  35   interrupts:
  36     maxItems: 1
  37
  38   pinctrl-0: true
  39   pinctrl-1: true
  40
  41   pinctrl-names:
  42     description:
  43       When present, must have one state named "default",
  44       and may contain a second name named "sleep". The former
  45       state sets up pins for ordinary operation whereas
  46       the latter state will put the associated pins to sleep
  47       when the UART is unused
  48     minItems: 1
  49     items:
  50       - const: default
  51       - const: sleep
  52
  53   clocks:
  54     description:
  55       When present, the first clock listed must correspond to
  56       the clock named UARTCLK on the IP block, i.e. the clock
  57       to the external serial line, whereas the second clock
  58       must correspond to the PCLK clocking the internal logic
  59       of the block. Just listing one clock (the first one) is
  60       deprecated.
  61     maxItems: 2
  62
  63   clock-names:
  64     items:
  65       - const: uartclk
  66       - const: apb_pclk
  67
  68   dmas:
  69     minItems: 1
  70     maxItems: 2
  71
  72   dma-names:
  73     minItems: 1
  74     items:
  75       - const: rx
  76       - const: tx
  77
  78   auto-poll:
  79     description:
  80       Enables polling when using RX DMA.
  81     type: boolean
  82
  83   poll-rate-ms:
  84     description:
  85       Rate at which poll occurs when auto-poll is set.
  86       default 100ms.
  87     default: 100
  88
  89   poll-timeout-ms:
  90     description:
  91       Poll timeout when auto-poll is set, default
  92       3000ms.
  93     default: 3000
  94
  95   resets:
  96     maxItems: 1
  97
  98   reg-io-width:
  99     description:
 100       The size (in bytes) of the IO accesses that should be performed
 101       on the device.
 102     enum: [1, 4]
 103
 104 required:
 105   - compatible
 106   - reg
 107   - interrupts
 108
 109 dependencies:
 110   poll-rate-ms: [ auto-poll ]
 111   poll-timeout-ms: [ auto-poll ]
 112
 113 unevaluatedProperties: false
 114
 115 examples:
 116   - |
 117     serial@80120000 {
 118       compatible = "arm,pl011", "arm,primecell";
 119       reg = <0x80120000 0x1000>;
 120       interrupts = <0 11 4>;
 121       dmas = <&dma 13 0 0x2>, <&dma 13 0 0x0>;
 122       dma-names = "rx", "tx";
 123       clocks = <&foo_clk>, <&bar_clk>;
 124       clock-names = "uartclk", "apb_pclk";
 125     };
 126
 127 ...