[U-Boot] [PATCH 8/8] tegra2: Create SPI/UART switch code

[Mike Frysinger]

On Thursday 20 October 2011 16:23:33 Simon Glass wrote:
> On Thu, Oct 20, 2011 at 1:09 PM, Mike Frysinger wrote:
> > On Thursday 20 October 2011 15:03:29 Simon Glass wrote:
> >> --- a/board/nvidia/seaboard/seaboard.c
> >> +++ b/board/nvidia/seaboard/seaboard.c
> >> 
> >> +/* TODO: Remove this code when the SPI switch is working */
> >> +#ifndef CONFIG_SPI_UART_SWITCH
> > 
> > eh ?  isn't it working after these patches ?
> 
> No, we need to resolve the NS16550 buffering issue, and also work out
> how to get that driver to indicate when it needs to 'claim' the pins
> from SPI.
> 
> I have a working implementation, and patches for it. Basically I call
> uart_enable() from the NS16550 driver before writing any serial data
> out or when wanting to read serial data. But it is ugly and I am torn
> between simple ugliness and complex pervasiveness.
> 
> Advice welcome.

hmmmmmmmmmm.  this is probably crazy, but ... if you enable multi serial, 
enable the ns16550 driver, and then write another "serial" driver that merely 
makes the relevant pinmux calls before tailing into the ns16550, and then set 
your stdout/stdin/stderr to that glue driver ...
-mike
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