linux-kernel - Re: [PATCH v2 1/4] of_serial: add support for setup quirks

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Message-ID: <CABE8wwszp3MoVxCdUfjUtvMkugL7VzOYTSxFQwqwQ7U9Wr0kbA@mail.gmail.com>
Date:	Mon, 9 Apr 2012 12:15:50 -0700
From:	"Williams, Dan J" <dan.j.williams@...el.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	gregkh@...uxfoundation.org, Stephen Warren <swarren@...dia.com>,
	linux-kernel@...r.kernel.org,
	Grant Likely <grant.likely@...retlab.ca>,
	linux-serial@...r.kernel.org, Colin Cross <ccross@...roid.com>,
	Olof Johansson <olof@...om.net>, alan@...ux.intel.com
Subject: Re: [PATCH v2 1/4] of_serial: add support for setup quirks

On Mon, Apr 9, 2012 at 11:49 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Monday 09 April 2012, Dan Williams wrote:
>> Benign conversion of of_serial.c to offer the option of 'setup' quirks
>> similar to how 8250_pci.c houses the pci-serial-device quirks.
>>
>> A setup quirk allows custom uart_port ops to specified in the
>> of_serial_info data fed to each serial of_device_id.
>>
>> Tegra's 'break' quirk is the target consumer.
>>
>> Cc: Colin Cross <ccross@...roid.com>
>> Cc: Olof Johansson <olof@...om.net>
>> Cc: Stephen Warren <swarren@...dia.com>
>> Cc: Arnd Bergmann <arnd@...db.de>
>> Cc: Grant Likely <grant.likely@...retlab.ca>
>> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
>> ---
>>  drivers/tty/serial/of_serial.c |   68 ++++++++++++++++++++++++++++------------
>>  1 files changed, 47 insertions(+), 21 deletions(-)
>
> I don't think this is a good idea. Aside from the bug that you introduce
> (you can no longer have multiple ports of the same type because of overwrite
> the static info->line number),

ah, yes, good catch.

> it seems an unnecessary complication.
> Either just add the quirk to the of_serial file based on the compatible value,
> or do a trivial new driver that has a subset of the existing one you need,
> plus the quirk.

ok.

The open question was where to house tegra_serial_handle_break, I'd
just as soon keep it all in of_serial.c and maintain the temporary
exports for use in the to-be-removed board files in
arch/arm/mach-tegra.

--
Dan
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