| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: GPL-2.0 |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/serial/rs485.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: RS485 serial communications |
| 8 | |
| 9 | description: The RTS signal is capable of automatically controlling line |
| 10 | direction for the built-in half-duplex mode. The properties described |
| 11 | hereafter shall be given to a half-duplex capable UART node. |
| 12 | |
| 13 | maintainers: |
| 14 | - Rob Herring <robh@kernel.org> |
| 15 | |
| 16 | properties: |
| 17 | rs485-rts-delay: |
| 18 | description: prop-encoded-array <a b> |
| 19 | $ref: /schemas/types.yaml#/definitions/uint32-array |
| 20 | items: |
| 21 | items: |
| 22 | - description: Delay between rts signal and beginning of data sent in |
| 23 | milliseconds. It corresponds to the delay before sending data. |
| 24 | default: 0 |
| 25 | maximum: 100 |
| 26 | - description: Delay between end of data sent and rts signal in milliseconds. |
| 27 | It corresponds to the delay after sending data and actual release |
| 28 | of the line. |
| 29 | default: 0 |
| 30 | maximum: 100 |
| 31 | |
| 32 | rs485-rts-active-high: |
| 33 | description: drive RTS high when sending (this is the default). |
| 34 | $ref: /schemas/types.yaml#/definitions/flag |
| 35 | |
| 36 | rs485-rts-active-low: |
| 37 | description: drive RTS low when sending (default is high). |
| 38 | $ref: /schemas/types.yaml#/definitions/flag |
| 39 | |
| 40 | rs485-rx-active-high: |
| 41 | description: Polarity of receiver enable signal (when separate from RTS). |
| 42 | True indicates active high (default is low). |
| 43 | $ref: /schemas/types.yaml#/definitions/flag |
| 44 | |
| 45 | linux,rs485-enabled-at-boot-time: |
| 46 | description: enables the rs485 feature at boot time. It can be disabled |
| 47 | later with proper ioctl. |
| 48 | $ref: /schemas/types.yaml#/definitions/flag |
| 49 | |
| 50 | rs485-rx-during-tx: |
| 51 | description: enables the receiving of data even while sending data. |
| 52 | $ref: /schemas/types.yaml#/definitions/flag |
| 53 | |
| 54 | rs485-term-gpios: |
| 55 | description: GPIO pin to enable RS485 bus termination. |
| 56 | maxItems: 1 |
| 57 | |
| 58 | rs485-rx-during-tx-gpios: |
| 59 | description: Output GPIO pin that sets the state of rs485-rx-during-tx. This |
| 60 | signal can be used to control the RX part of an RS485 transceiver. Thereby |
| 61 | the active state enables RX during TX. |
| 62 | maxItems: 1 |
| 63 | |
| 64 | additionalProperties: true |
| 65 | |
| 66 | ... |