How to disable (sw_uart_pm) clock on uart0

[kotrs]

Hello,
I need to use ppp over uart0, but uart0 has (sw_uart_pm) clk enabled. I think that it blocks the communication. I stopped the agetty daemon of course. The uart0 runs well over minicom, but not over ppp. How can I disable the (sw_uart_pm) clk on uart0?

Thank you