| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | |
| Tom Rini | 6bb92fc | 2024-05-20 09:54:58 -0600 | [diff] [blame] | 61 | power-domains: |
| 62 | maxItems: 1 |
| 63 | |
| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 64 | rx-threshold: |
| 65 | description: |
| 66 | If value is set to 1, RX FIFO threshold is disabled. |
| 67 | enum: [1, 2, 4, 8, 12, 14, 16] |
| 68 | default: 8 |
| 69 | |
| 70 | tx-threshold: |
| 71 | description: |
| 72 | If value is set to 1, TX FIFO threshold is disabled. |
| 73 | enum: [1, 2, 4, 8, 12, 14, 16] |
| 74 | default: 8 |
| 75 | |
| Tom Rini | 762f85b | 2024-07-20 11:15:10 -0600 | [diff] [blame] | 76 | access-controllers: |
| 77 | minItems: 1 |
| 78 | maxItems: 2 |
| 79 | |
| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 80 | allOf: |
| 81 | - $ref: rs485.yaml# |
| 82 | - $ref: serial.yaml# |
| 83 | - if: |
| 84 | required: |
| 85 | - st,hw-flow-ctrl |
| 86 | then: |
| 87 | properties: |
| 88 | cts-gpios: false |
| 89 | rts-gpios: false |
| 90 | - if: |
| 91 | properties: |
| 92 | compatible: |
| 93 | const: st,stm32-uart |
| 94 | then: |
| 95 | properties: |
| 96 | rx-tx-swap: false |
| 97 | - if: |
| 98 | properties: |
| 99 | compatible: |
| 100 | contains: |
| 101 | enum: |
| 102 | - st,stm32-uart |
| 103 | - st,stm32f7-uart |
| 104 | then: |
| 105 | properties: |
| 106 | rx-threshold: false |
| 107 | tx-threshold: false |
| 108 | |
| 109 | required: |
| 110 | - compatible |
| 111 | - reg |
| 112 | - interrupts |
| 113 | - clocks |
| 114 | |
| 115 | unevaluatedProperties: false |
| 116 | |
| 117 | examples: |
| 118 | - | |
| 119 | #include <dt-bindings/clock/stm32mp1-clks.h> |
| 120 | usart1: serial@40011000 { |
| 121 | compatible = "st,stm32h7-uart"; |
| 122 | reg = <0x40011000 0x400>; |
| 123 | interrupts = <37>; |
| 124 | clocks = <&rcc 0 164>; |
| 125 | dmas = <&dma2 2 4 0x414 0x0>, |
| 126 | <&dma2 7 4 0x414 0x0>; |
| 127 | dma-names = "rx", "tx"; |
| 128 | rx-threshold = <4>; |
| 129 | tx-threshold = <4>; |
| 130 | rs485-rts-active-low; |
| 131 | }; |
| 132 | |
| 133 | ... |