| Message ID | 20220404082912.6885-6-ilpo.jarvinen@linux.intel.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add RS485 support to DW UART | expand |
diff --git a/Documentation/devicetree/bindings/serial/rs485.yaml b/Documentation/devicetree/bindings/serial/rs485.yaml index 0c9fa694f85c..f2c9c9fe6aa7 100644 --- a/Documentation/devicetree/bindings/serial/rs485.yaml +++ b/Documentation/devicetree/bindings/serial/rs485.yaml @@ -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.
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: Rob Herring <robh+dt@kernel.org> Cc: devicetree@vger.kernel.org Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> --- Documentation/devicetree/bindings/serial/rs485.yaml | 5 +++++ 1 file changed, 5 insertions(+)