linux-kernel - Re: [PATCH v2] iio: Add IIO support for the DAC on the Apex Embedded Systems STX104

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Date:	Wed, 10 Feb 2016 18:55:45 +0000
From:	Jonathan Cameron <jic23@...nel.org>
To:	William Breathitt Gray <vilhelm.gray@...il.com>
Cc:	knaack.h@....de, lars@...afoo.de, pmeerw@...erw.net,
	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: Add IIO support for the DAC on the Apex Embedded
 Systems STX104

On 10/02/16 02:19, William Breathitt Gray wrote:
> On Tue, Feb 09, 2016 at 10:37:09PM +0000, Jonathan Cameron wrote:
>> My only real question is on the naming of the module parameter.
>> Is it the equivalent of the io address that a load of ISA
>> radio drivers seem to use?  (fed to me by grepping isa_register_driver)
>> If so perhaps that's the 'standard' name as much as one exists for this?
> 
> Yes, you noted correctly that the stx104_base module parameter fulfills
> the same function as the io module parameter used in many of the radio
> drivers: it's an array holding the io port address of each device.
> However, I find "io" to be a rather vague module parameter name, so I've
> decided to use the more apt "stx104_base" name for my array of base
> addresses.
> 
> As you've probably noticed, there are few ISA drivers existing in the
> kernel baseline currently, so not much of a standard is set yet. I'm all
> right with renaming the module parameter if you have a preference, just
> as long as the name is more informative than simply "io."
> 
> For what it's worth, this driver is part of a series of PC/104 drivers
> I've been submitting to various subsystems (in the hopes of improving
> the lack of PC/104 support in the baseline Linux kernel); see
> drivers/gpio/gpio-104-idio-16.c and drivers/gpio/gpio-104-idi-48.c for
> example. I have thus far been following the convention of naming the
> base address module parameter as "modname_base," where "modname" is the
> respective module name.
I've been trying to work out if IO ports is a generic enough ISA term
to take the view that anyone using an ISA card should know about it...
I certainly know the I/O space approach to interacting with PCI cards is
well understood in people working with shall we say 'dumb' PCI hardware.

I guess I don't really care all that much on this though - just nice to
be consistent / general when possible.

Jonathan

> 
> William Breathitt Gray
>