diff mbox series

ARM: dts: am335x-pdu001: Fix RS-485 transceiver switching

Message ID 20250529135324.182868-1-fb@ltec.ch
State New
Headers show
Series ARM: dts: am335x-pdu001: Fix RS-485 transceiver switching | expand

Commit Message

Felix Brack May 29, 2025, 1:53 p.m. UTC 
The wiring of the RS-485 transceiver of UART0 of the PDU-001 board
allows sending or receiving date exclusively. In other words: no
character transmitted will ever be received.
Hence the tx-filter counter in the OMAP serial driver can't work
correctly as it relies on receiving the transmitted characters.
This in turn will prevent reception of data unless we disable the
tx-filter counter.
This patch disables the tx-filter counter by enabling the DTS setting
rs485-rx-during-tx. This might sound like the opposite to be done but
it uses the enabling of rs485-rx-during-tx not for receiving the data
transmitted but for disabling the tx-fiter counter.

Tested-by: Felix Brack <fb@ltec.ch>
Signed-off-by: Felix Brack <fb@ltec.ch>
---
 arch/arm/boot/dts/ti/omap/am335x-pdu001.dts | 1 +
 1 file changed, 1 insertion(+)
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/ti/omap/am335x-pdu001.dts b/arch/arm/boot/dts/ti/omap/am335x-pdu001.dts
index ded19e24e666..6c96840fe8be 100644
--- a/arch/arm/boot/dts/ti/omap/am335x-pdu001.dts
+++ b/arch/arm/boot/dts/ti/omap/am335x-pdu001.dts
@@ -258,6 +258,7 @@  &uart0 {
 
 	rts-gpio = <&gpio1 9 GPIO_ACTIVE_HIGH>;
 	rs485-rts-active-high;
+	rs485-rx-during-tx;
 	rs485-rts-delay = <0 0>;
 	linux,rs485-enabled-at-boot-time;