[PATCH 4/7] dt_bindings: snps-dw-apb-uart: Add RS485

[Ilpo Järvinen]

Add RS485 enable & line polarity properties.

Cc: Rob Herring <robh+dt@xxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
---
 .../bindings/serial/snps-dw-apb-uart.yaml       | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml b/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml
index 12137fe80acf..8d440afabb1f 100644
--- a/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml
@@ -103,6 +103,23 @@ properties:
       register. Define this if your serial port does not use this pin.
     type: boolean
 
+  snps,rs485-interface-en:
+    description: Use true RS-485 DE and RE signals (in contrast to RS-485
+      emulation using RTS). Requires IP version 4 or above.
+    type: boolean
+
+  snps,de-active-high:
+    description: Defines the polarity of driver enable (DE_EN) signal.
+      Meaningful only with snps,rs485-interface-en. True indicates active
+      high.
+    type: boolean
+
+  snps,re-active-high:
+    description: Defines the polarity of receiver enable (RE_EN) signal.
+      Meaningful only with snps,rs485-interface-en. True indicates active
+      high.
+    type: boolean
+
 required:
   - compatible
   - reg
-- 
2.30.2