linux-kernel - Re: [PATCH RFC 3/6] tty: Rename xilinx_uart -> cadence

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Message-ID: <20140304193913.71c6f307@alan.etchedpixels.co.uk>
Date:	Tue, 4 Mar 2014 19:39:13 +0000
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Soren Brinkmann <soren.brinkmann@...inx.com>
Cc:	Russell King <linux@....linux.org.uk>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Michal Simek <michal.simek@...inx.com>,
	Peter Crosthwaite <peter.crosthwaite@...inx.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-serial@...r.kernel.org, Olof Johansson <olof@...om.net>,
	Arnd Bergmann <arnd@...db.de>,
	Kevin Hilman <khilman@...aro.org>
Subject: Re: [PATCH RFC 3/6] tty: Rename xilinx_uart -> cadence_uart

On Tue,  4 Mar 2014 09:17:26 -0800
Soren Brinkmann <soren.brinkmann@...inx.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@...inx.com>
> Acked-by: Peter Crosthwaite <peter.crosthwaite@...inx.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
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