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 7title: RS485 serial communications 8 9description: 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 13maintainers: 14 - Rob Herring <robh@kernel.org> 15 16properties: 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 64additionalProperties: true 65 66... 67