linux-kernel - Re: [W1] a driver for DS2405 chip

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Date:	Wed, 3 Nov 2010 21:54:12 +1100
From:	Ben Nizette <bn@...sdigital.com>
To:	Maciej Szmigiero <mhej@...pl>
Cc:	Jonathan Cameron <jic23@....ac.uk>, johnpol@....mipt.ru,
	linux-kernel@...r.kernel.org,
	David Brownell <dbrownell@...rs.sourceforge.net>
Subject: Re: [W1] a driver for DS2405 chip


On 03/11/2010, at 6:53 AM, Maciej Szmigiero wrote:

> W dniu 01.11.2010 13:35, Jonathan Cameron pisze:
>> On 10/28/10 21:52, Maciej Szmigiero wrote:
>>> [W1] a driver for DS2405 chip
>>> 
>>> This is a driver for DS2405 1-wire single-channel addressable switch / PIO.
>>> DS2405 can also work as single-channel binary remote sensor.
>> Perhaps handle this as a gpio chip? (be it a fairly limited one)
>> To my mind it would make it more generally useful...
> 
> I think the GPIO infrastructure is meant for on-system GPIOs, where 1-wire devices are mostly 
> used for remote data acquisition.

Nope!  The contents of drivers/gpio is split roughly 50/50 between on- and off-chip gpio expanders. 

> That's probably why w1_therm (for 1-wire thermometers) is not integrated with HWMON subsystem.

Don't know why this is but kinda sounds like it should be looked at more closely - conceptually 1-W is just another bus like, eg, SPI.

	--Ben.

> 
> Maciej Szmigiero
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