Bindings/serial/st,stm32-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/st,stm32-uart.yaml#
   5 $schema: http://devicetree.org/meta-schemas/core.yaml#
   6
   7 maintainers:
   8   - Erwan Le Ray <erwan.leray@foss.st.com>
   9
  10 title: STMicroelectronics STM32 USART
  11
  12 properties:
  13   compatible:
  14     enum:
  15       - st,stm32-uart
  16       - st,stm32f7-uart
  17       - st,stm32h7-uart
  18
  19   reg:
  20     maxItems: 1
  21
  22   interrupts:
  23     maxItems: 1
  24
  25   clocks:
  26     maxItems: 1
  27
  28   resets:
  29     maxItems: 1
  30
  31   label:
  32     description: label associated with this uart
  33
  34   st,hw-flow-ctrl:
  35     description: enable hardware flow control (deprecated)
  36     $ref: /schemas/types.yaml#/definitions/flag
  37
  38   rx-tx-swap: true
  39
  40   dmas:
  41     minItems: 1
  42     maxItems: 2
  43
  44   dma-names:
  45     items:
  46       enum: [ rx, tx ]
  47     minItems: 1
  48     maxItems: 2
  49
  50 # cts-gpios and rts-gpios properties can be used instead of 'uart-has-rtscts'
  51 # or 'st,hw-flow-ctrl' (deprecated) for making use of any gpio pins for flow
  52 # control instead of dedicated pins.
  53 #
  54 # It should be noted that both cts-gpios/rts-gpios and 'uart-has-rtscts' or
  55 # 'st,hw-flow-ctrl' (deprecated) properties cannot co-exist in a design.
  56   cts-gpios: true
  57   rts-gpios: true
  58
  59   wakeup-source: true
  60
  61   rx-threshold:
  62     description:
  63       If value is set to 1, RX FIFO threshold is disabled.
  64     enum: [1, 2, 4, 8, 12, 14, 16]
  65     default: 8
  66
  67   tx-threshold:
  68     description:
  69       If value is set to 1, TX FIFO threshold is disabled.
  70     enum: [1, 2, 4, 8, 12, 14, 16]
  71     default: 8
  72
  73 allOf:
  74   - $ref: rs485.yaml#
  75   - $ref: serial.yaml#
  76   - if:
  77       required:
  78         - st,hw-flow-ctrl
  79     then:
  80       properties:
  81         cts-gpios: false
  82         rts-gpios: false
  83   - if:
  84       properties:
  85         compatible:
  86           const: st,stm32-uart
  87     then:
  88       properties:
  89         rx-tx-swap: false
  90   - if:
  91       properties:
  92         compatible:
  93           contains:
  94             enum:
  95               - st,stm32-uart
  96               - st,stm32f7-uart
  97     then:
  98       properties:
  99         rx-threshold: false
 100         tx-threshold: false
 101
 102 required:
 103   - compatible
 104   - reg
 105   - interrupts
 106   - clocks
 107
 108 unevaluatedProperties: false
 109
 110 examples:
 111   - |
 112     #include <dt-bindings/clock/stm32mp1-clks.h>
 113     usart1: serial@40011000 {
 114       compatible = "st,stm32h7-uart";
 115       reg = <0x40011000 0x400>;
 116       interrupts = <37>;
 117       clocks = <&rcc 0 164>;
 118       dmas = <&dma2 2 4 0x414 0x0>,
 119              <&dma2 7 4 0x414 0x0>;
 120       dma-names = "rx", "tx";
 121       rx-threshold = <4>;
 122       tx-threshold = <4>;
 123       rs485-rts-active-low;
 124     };
 125
 126 ...