6.10-stable review patch. If anyone has any objections, please let me know.
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From: Josua Mayer josua@solid-run.com
[ Upstream commit 9dcc0e1065f3c40d0b2ad79a858bb4ebaba33167 ]
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.... Signed-off-by: Vignesh Raghavendra vigneshr@ti.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/ti/k3-am642-hummingboard-t.dts | 1 - 1 file changed, 1 deletion(-)
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 234d76e4e9445..5b5e9eeec5ac4 100644 --- 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 @@ &main_uart3 { pinctrl-names = "default"; pinctrl-0 = <&main_uart3_default_pins>; uart-has-rtscts; - rs485-rts-active-low; linux,rs485-enabled-at-boot-time; status = "okay"; };