From: Arnout Vandecappelle <arnout@mind.be>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-serial@vger.kernel.org
Subject: Re: Driver for SPI-based 8250 serial port
Date: Wed, 05 Sep 2012 18:29:33 +0200 [thread overview]
Message-ID: <50477DED.602@mind.be> (raw)
In-Reply-To: <20120905141218.7556f902@pyramind.ukuu.org.uk>
On 09/05/12 15:12, Alan Cox wrote:
>> > - Should I add a UPIO_SPI to the global I/O types, or should I override the
>> > serial_in/serial_out functions in struct plat_serial8250_port?
> I am not sure you'll make the 8250 driver handle the device because I
> suspect a lot of the serial_in/serial_out calls occur with interrupts
> disabled on the assumption that they are basically atomic fast operations.
Argh, that's right.
So it will be a completely new driver then. Using the tty layer directly seems
to be a good suggestion: it looks like the uart layer (like the 8250 driver) is
carrying a lot of cruft for supporting all those quirks in the different devices.
ifx6x60 looks like a good source of inspiration.
Regards,
Arnout
--
Arnout Vandecappelle arnout at mind be
Senior Embedded Software Architect +32-16-286540
Essensium/Mind http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
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prev parent reply other threads:[~2012-09-05 16:29 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-05 12:47 Driver for SPI-based 8250 serial port Arnout Vandecappelle
2012-09-05 13:12 ` Alan Cox
2012-09-05 16:29 ` Arnout Vandecappelle [this message]
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