From: Thor Thayer <>

Add the device tree binding needed to support the TX FIFO threshold

Signed-off-by: Thor Thayer <>
v2  Change parameter name from tx-loadsz to tx-threshold
 Documentation/devicetree/bindings/serial/8250.txt |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/8250.txt 
index 936ab5b..f86bb06 100644
--- a/Documentation/devicetree/bindings/serial/8250.txt
+++ b/Documentation/devicetree/bindings/serial/8250.txt
@@ -42,6 +42,8 @@ Optional properties:
 - auto-flow-control: one way to enable automatic flow control support. The
   driver is allowed to detect support for the capability even without this
+- tx-threshold: Specify the TX FIFO low water indication for parts with
+  programmable TX FIFO thresholds.
 * fsl,ns16550:

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