linux-kernel - Re: [PATCH v2 17/19] auxdisplay: img-ascii-lcd: driver for simple ASCII LCD displays

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Date:   Tue, 27 Sep 2016 20:52:37 +0200
From:   Ralf Baechle <ralf@...ux-mips.org>
To:     Paul Burton <paul.burton@...tec.com>
Cc:     linux-mips@...ux-mips.org,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
        linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH v2 17/19] auxdisplay: img-ascii-lcd: driver for simple
 ASCII LCD displays

On Fri, Aug 26, 2016 at 03:17:49PM +0100, Paul Burton wrote:

> Add a driver for simple ASCII LCD displays found on the MIPS Boston,
> Malta & SEAD3 development boards. The Boston display is an independent
> memory mapped device with a simple memory mapped 8 byte register space
> containing the 8 ASCII characters to display. The Malta display is
> exposed as part of the Malta board registers, and provides 8 registers
> each of which corresponds to one of the ASCII characters to display. The
> SEAD3 display is slightly more complex, exposing an interface to an
> S6A0069 LCD controller via registers provided by the boards CPLD.
> However although the displays differ in their register interface, we
> require similar functionality on each board so abstracting away the
> differences within a single driver allows us to share a significant
> amount of code & ensure consistent behaviour.
> 
> The driver displays the Linux kernel version as the default message, but
> allows the message to be changed via a character device. Messages longer
> then the number of characters that the display can show will scroll.
> 
> This provides different behaviour to the existing LCD display code for
> the MIPS Malta or MIPS SEAD3 platforms in the following ways:
> 
>   - The default string to display is not "LINUX ON MALTA" or "LINUX ON
>     SEAD3" but "Linux" followed by the version number of the kernel
>     (UTS_RELEASE).
> 
>   - Since that string tends to be significantly longer it scrolls twice
>     as fast, moving every 500ms rather than every 1s.
> 
>   - The LCD won't be updated until the driver is probed, so it doesn't
>     provide the early "LINUX" string.

Right now parts 15..18 of this series are stalled due to the lack of an
ack for this patch.

Miguel?

  Ralf