arm64: dts: ti: k3-am642-hummingboard-t: correct rs485 rts polarity

The RS485 transceiver RE (Receiver enable) and DE (Driver enable) are
shorted and connected to both RTS/CTS of the SoC UART.
RE is active-low, DE is active-high.

Remove the "rs485-rts-active-low" flag to match RTS polarity with DE,
and fix communication in both transmit and receive directions.

Fixes: d60483faf914 ("arm64: dts: add description for solidrun am642 som and evaluation board")
Signed-off-by: Josua Mayer <josua@solid-run.com>
Link: https://lore.kernel.org/r/20240504-ti-rs485-rts-v1-1-e88ef1c96f34@solid-run.com
Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>

diff --git a/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts b/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts
index 234d76e4e9445bd22e82f7450beebffb588832c2..5b5e9eeec5ac4856ee91d09ac34f469a2243b887 100644 (file)
--- a/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts
+++ b/arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts
@@ -282,7 +282,6 @@
        pinctrl-names = "default";
        pinctrl-0 = <&main_uart3_default_pins>;
        uart-has-rtscts;
-       rs485-rts-active-low;
        linux,rs485-enabled-at-boot-time;
        status = "okay";
 };