How to interface an external DUART chip with the ifc bus of an ls1021a-twr board?

[sujay1]

Hi,

I'm trying to interface an external duart XR68M752IM48  to my custom ls1021a-twr board's ifc bus,

Can you please tell me what are the changes I may have to make to the driver to interface this chip and also the changes I have to make in the dts file fot configure a duart node?

[Pavel]

See as example the AN12098:

https://www.nxp.com/webapp/Download?colCode=AN12098&location=null

It looks like the driver is needed the XR68M752IM48 using as duart on the LS1021a board.

The LS1021a supports 6 LPUARTs. Usually these UART are used if additional UARTs are needed.

Have a great day,
Pavel Chubakov

[sujay1]

Hi Pavel,

Is there any driver already available for this? also can you please explain in detail how to configure the kernel to add support for XR68M752IM48 .

[Pavel]

See the following pages about new serial driver in Linux:

https://www.kernel.org/doc/Documentation/serial/driver

https://bootlin.com/doc/legacy/serial-drivers/linux-serial-drivers.pdf

https://www.oreilly.com/library/view/linux-device-drivers/0596005903/ch18.html

https://tldp.org/HOWTO/pdf/Serial-HOWTO.pdf