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AM6548: WKUP UART0 Transmitting and Receiving at twice set Baud rate

Akm Islam
Prodigy 195 points
Part Number: AM6548

Tool/software:

Hi,

I've added WKUP UART0 to the device tree in Linux, and set the baud rate to 9600 in Linux using stty -F /ttySn. When I use the third COM port to interact with the serial port, I need to set it at twice the baud rate (19200) to transmit and receive data correctly. What could be the cause of this issue?

  • 0
    TI__Guru*** 133096 points

    Hi Akm,

    Please try the following kernel device tree patch to see if solves the issue.

    diff --git a/arch/arm64/boot/dts/ti/k3-am65-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-am65-wakeup.dtsi
index fd2b998ebddc..1cd0580122d0 100644
--- a/arch/arm64/boot/dts/ti/k3-am65-wakeup.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am65-wakeup.dtsi
@@ -51,7 +51,6 @@ wkup_uart0: serial@42300000 {
                compatible = "ti,am654-uart";
                reg = <0x42300000 0x100>;
                interrupts = <GIC_SPI 697 IRQ_TYPE_LEVEL_HIGH>;
-               clock-frequency = <48000000>;
                current-speed = <115200>;
                power-domains = <&k3_pds 150 TI_SCI_PD_EXCLUSIVE>;
                status = "disabled";