[PATCH RFC 3/6] tty: Rename xilinx_uart -> cadence_uart

[One Thousand Gnomes]

On Tue,  4 Mar 2014 09:17:26 -0800
Soren Brinkmann <soren.brinkmann at xilinx.com> wrote:

> The UART controller in Zynq is Cadence IP. Rename the driver
> accordingly.
> Furthermore, this affects the DT bindings:
>  - the compatibility string changes to 'cdns,uart-r1p8'
>  - clock inputs are named according to Cadence documentation - 'pclk'
>    and 'uart_clk'
> 
> Signed-off-by: Soren Brinkmann <soren.brinkmann at xilinx.com>
> Acked-by: Peter Crosthwaite <peter.crosthwaite at xilinx.com>

NAK. This breaks existing userspace builds, it breaks modules, it messes
with the history and it breaks third prty DT files. It's an absolute
no-no.

Yes this happens - it's happened before and will happen again. She who
merges first wins. If Cadence had submitted a driver first they'd have
won 8)

The following aspects of the change set are IMHO acceptable

- Cleaning up all the code formatting
- Update the driver comments and header to explain the Cadence/Xilinx
  thing
- change "Xilinx PS UART Support" text to "Cadence (Xilinx PS) Support"
  or similar wording in Kconfig
- Adding the cadence devicetree compatibility strings and inputs *in
  addition* to the existing ones.
- Documentation for the new options

Alan