linux-kernel - Re: [PATCH 1/2] misc: add nirtfeatures driver

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Date:	Mon, 14 Mar 2016 17:30:22 -0500
From:	Josh Cartwright <joshc@...com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	Kyle Roeschley <kyle.roeschley@...com>, arnd@...db.de,
	linux-kernel@...r.kernel.org, jeff.westfahl@...com,
	nathan.sullivan@...com, xander.huff@...com,
	Lee Jones <lee.jones@...aro.org>
Subject: Re: [PATCH 1/2] misc: add nirtfeatures driver

On Mon, Mar 14, 2016 at 03:05:59PM -0700, Greg KH wrote:
> On Mon, Mar 14, 2016 at 04:54:32PM -0500, Kyle Roeschley wrote:
> > From: Jeff Westfahl <jeff.westfahl@...com>
> > 
> > This driver introduces support for hardware features of National
> > Instruments real-time controllers. This is an ACPI device that exposes
> > LEDs, switches, and watchdogs.
> 
> If it's an acpi driver, why not put it in drivers/acpi?

For the same reason we don't move all drivers for devices-on-a-PCI-bus
into drivers/pci?

Drivers typically exist in the sourcetree with other drivers which
implement similar functionality, which works great for devices with
clear functional boundaries (GPIO controller drivers in drivers/gpio,
led drivers in drivers/leds, etc. etc.); but for devices which are a
hodgepodge of functionality, there isn't really a good fit anywhere
except maybe in misc or mfd.

We could move it to mfd, but drivers in drivers/mfd which don't make use
of MFD_CORE seems equally strange (although, I suppose there is
precedent).  Maybe Lee has some thoughts.

  Josh

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