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| -rw-r--r-- | Documentation/devicetree/bindings/serial/rs485.yaml | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml new file mode 100644 index 0000000000..9418fd66a8 --- /dev/null +++ b/Documentation/devicetree/bindings/serial/rs485.yaml @@ -0,0 +1,66 @@ +# SPDX-License-Identifier: GPL-2.0 +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/serial/rs485.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: RS485 serial communications + +description: The RTS signal is capable of automatically controlling line + direction for the built-in half-duplex mode. The properties described + hereafter shall be given to a half-duplex capable UART node. + +maintainers: + - Rob Herring <robh@kernel.org> + +properties: + rs485-rts-delay: + description: prop-encoded-array <a b> + $ref: /schemas/types.yaml#/definitions/uint32-array + items: + items: + - description: Delay between rts signal and beginning of data sent in + milliseconds. It corresponds to the delay before sending data. + default: 0 + maximum: 100 + - description: Delay between end of data sent and rts signal in milliseconds. + It corresponds to the delay after sending data and actual release + of the line. + default: 0 + maximum: 100 + + rs485-rts-active-high: + description: drive RTS high when sending (this is the default). + $ref: /schemas/types.yaml#/definitions/flag + + rs485-rts-active-low: + description: drive RTS low when sending (default is high). + $ref: /schemas/types.yaml#/definitions/flag + + rs485-rx-active-high: + description: Polarity of receiver enable signal (when separate from RTS). + True indicates active high (default is low). + $ref: /schemas/types.yaml#/definitions/flag + + linux,rs485-enabled-at-boot-time: + description: enables the rs485 feature at boot time. It can be disabled + later with proper ioctl. + $ref: /schemas/types.yaml#/definitions/flag + + rs485-rx-during-tx: + description: enables the receiving of data even while sending data. + $ref: /schemas/types.yaml#/definitions/flag + + rs485-term-gpios: + description: GPIO pin to enable RS485 bus termination. + maxItems: 1 + + rs485-rx-during-tx-gpios: + description: Output GPIO pin that sets the state of rs485-rx-during-tx. This + signal can be used to control the RX part of an RS485 transceiver. Thereby + the active state enables RX during TX. + maxItems: 1 + +additionalProperties: true + +... |