linux-kernel - Re: [Patch 0/4] IndustrialIO subsystem (ADCs, accelerometers etc)

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Date:	Wed, 23 Jul 2008 11:36:25 -0700
From:	David Brownell <david-b@...bell.net>
To:	Jonathan Cameron <Jonathan.Cameron@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	spi-devel-general@...ts.sourceforge.net,
	LM Sensors <lm-sensors@...sensors.org>,
	Jean Delvare <khali@...ux-fr.org>,
	Dmitry Torokhov <dtor@...l.ru>,
	"Hans J. Koch" <hjk@...utronix.de>, hmh@....eng.br,
	mgross@...ux.intel.com, Ben Nizette <bn@...sdigital.com>,
	Anton Vorontsov <avorontsov@...mvista.com>
Subject: Re: [Patch 0/4] IndustrialIO subsystem (ADCs, accelerometers etc)

On Wednesday 23 July 2008, Jonathan Cameron wrote:
> * Software ring buffer support to allow semi regular capture of data form the
>   device.  Typically this will be driven from either datardy events, or from
>   a periodic timer interrupt (to this end a very simple wrapper for periodic
>   RTC's is included. This will move to more generic timer interfaces as and when
>   they become available.  For now available rtc's must be registered with the
>   subsystem via the industrialio_register_ptimer function form within a board
>   init.

Could you elaborate a bit on why you'd want hardware supported
periodic timers, rather than either an hrtimer or a timer?
Maybe provide some real-world scenarios where those software
abstractions are inappropriate.

I can imagine numerous reasons, but those might not be yours...

- Dave
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