On Fri, Jan 15, 2021 at 04:15:43PM -0500, Al Cooper wrote: > Add a UART driver for the new Broadcom 8250 based STB UART. The new > UART is backward compatible with the standard 8250, but has some > additional features. The new features include a high accuracy baud > rate clock system and DMA support. > > The driver will use the new optional BAUD MUX clock to select the best > one of the four master clocks (81MHz, 108MHz, 64MHz and 48MHz) to feed > the baud rate selection logic for any requested baud rate. This allows > for more accurate BAUD rates when high speed baud rates are selected. > > The driver will use the new UART DMA hardware if the UART DMA registers > are specified in Device Tree "reg" property. The DMA functionality can > be disabled on kernel boot with the argument: > "8250_bcm7271.disable_dma=Y". Shouldn't that be on a per-device basis, and not a per-driver basis? And why would you want to disable this, if you have support for this in the DT? Why not just rely on the DT setting? thanks, greg k-h
