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-rw-r--r--dts/Bindings/serial/rs485.yaml67
1 files changed, 44 insertions, 23 deletions
diff --git a/dts/Bindings/serial/rs485.yaml b/dts/Bindings/serial/rs485.yaml
index d4beaf1122..9418fd66a8 100644
--- a/dts/Bindings/serial/rs485.yaml
+++ b/dts/Bindings/serial/rs485.yaml
@@ -4,42 +4,63 @@
$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 hereafter shall be given to a
- half-duplex capable UART node.
+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>
+ - Rob Herring <robh@kernel.org>
properties:
rs485-rts-delay:
description: prop-encoded-array <a b>
- allOf:
- - $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
+ $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.
+ 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
+ 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
+
+...