I have a driver for the MaxLinear XR20M117x family of UARTs that I'd like to contribute but have a couple questions. The driver is heavily based on the existing sc16is7xx driver. The driver started with the sample driver from MaxLinear for Linux 3.x.x, but as the integration of their driver proceeded into our 4.4 kernel, there were features and fixes missing that were present in the current sc16is7xx driver. The register set is similar, but there are a few places where the behavior is different. Would it be best to create a new driver or add the XR20M117x UARTs to the sc16is7xx driver with a flag to choose one behavior or the other? I have developed and tested the driver as a back-port of the mainline sc16is7xx driver to the 4.4 kernel used on our embedded platform. I don't have a ready method to test the driver with a newer kernel (other than ensuring compilation success). Is that a concern for accepting the driver? Part link: https://www.maxlinear.com/product/interface/uarts/i2c-spi-uarts/xr20m1172 Thanks, Jeff
