diff options
Diffstat (limited to 'Documentation/devicetree/bindings/serial/rs485.yaml')
| -rw-r--r-- | Documentation/devicetree/bindings/serial/rs485.yaml | 39 |
1 files changed, 28 insertions, 11 deletions
diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml index fe90569475e1..b93254ad2a28 100644 --- a/Documentation/devicetree/bindings/serial/rs485.yaml +++ b/Documentation/devicetree/bindings/serial/rs485.yaml @@ -4,7 +4,7 @@ $id: http://devicetree.org/schemas/serial/rs485.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# -title: RS485 serial communications Bindings +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 @@ -18,21 +18,29 @@ properties: 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: 1000 - - 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: 1000 + - 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. @@ -45,4 +53,13 @@ properties: 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 + ... |