Hi,
I'm using a Wifi/BT module with CYW4343W chip on a custom board with STM32MP157.
When booting the system, the driver is loaded correctly and dmesg log shows
[ 1.089865] 4000e000.serial: ttySTM1 at MMIO 0x4000e000 (irq = 24, base_baud = 6250000) is a stm32-usart
[ 1.105124] stm32-usart 4000e000.serial: interrupt mode used for rx (no dma)
[ 1.112211] stm32-usart 4000e000.serial: interrupt mode used for tx (no dma)
which indicates, that the BT UART is allocated to ttySTM1. Bluetooth is working correctly as well.
Anyway, in the userspace I can't see the ttySTM1 instance under /dev/tty*
But driver is loaded and device is shown as serial0-0:
board:~# ls -l /sys/bus/serial/devices/serial0-0/
total 0
drwxr-xr-x 3 root root 0 Nov 15 10:46 bluetooth
lrwxrwxrwx 1 root root 0 Nov 15 11:00 driver -> ../../../../../../bus/serial/drivers/hci_uart_bcm
-r--r--r-- 1 root root 4096 Nov 15 11:00 modalias
lrwxrwxrwx 1 root root 0 Nov 15 11:00 of_node -> ../../../../../../firmware/devicetree/base/soc/serial@4000e000/bluetooth
drwxr-xr-x 2 root root 0 Nov 15 11:00 power
lrwxrwxrwx 1 root root 0 Nov 15 10:46 subsystem -> ../../../../../../bus/serial
-rw-r--r-- 1 root root 4096 Nov 15 10:46 uevent
The goal is to change the baudrate of the UART connection. The appropriate tools (btattach, patchram etc.) require the correct device path.
Can anyone help?
Thanks in advance,
Kai
