Commit 103dcf2e authored by Ilpo Järvinen's avatar Ilpo Järvinen Committed by Greg Kroah-Hartman
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dt_bindings: rs485: Add receiver enable polarity 



Add polarity property for receiver enable. Some UARTs have separate
enable pins for tx (RTS or DE) and rx (RE). As most RS485 transceivers
have !RE pin, the default is active low in contrast to
rs485-rts-active-low that defaults to active high.

Cc: devicetree@vger.kernel.org
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220426122448.38997-4-ilpo.jarvinen@linux.intel.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 5ff33917

Documentation/devicetree/bindings/serial/rs485.yaml

+5 −0
Original line number Diff line number Diff line
@@ -33,6 +33,11 @@ properties: 
    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.