How to update sc16is7xx driver in Ubuntu Server 22.04 LTS with 5.15.0-1065-raspi

[tc2020]

I use RPi4 with SC16IS752 dual UART spi chip. The device runs on Ubuntu Server 22.04 LTS, kernel 5.15.0-1065-raspi currently.

Prior to about 5.15.0-1053-raspi kernel version, I can get data from both UARTs. However, with new versions thereafter, I can only get data from UART 0.
It seems the newer sc16is7xx driver has changes in data handling that affects my device operation. In either case, I can see in the dev directory both ttySC0 and ttySC1.

How do I fix this issue properly, so that it can handle future kernel updates more readily?.

Any help would be greatly appreciated. Thank you.

[julian552]

Before going any further, first examine the system logs for any errors or messages regarding UARTs after the system boots.

192.168.100.1 192.168.1.1