Do we have THVD1450 Linux 5.4 driver can share with customer?
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This device is a plain transceiver; it simply converts between logic voltages and RS-485 voltages. It is never directly accessed by software, and therefore does not need a driver.
The D/R/DE/RE pins are connected to something (probably a UART) that needs a driver. But that is independent from the THVD1450.