linux-kernel - Re: [PATCH 1/2] UIO: add device clock support

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Date:	Thu, 25 Jun 2009 03:41:21 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Greg KH <gregkh@...e.de>
Cc:	Daniel Mack <daniel@...aq.de>, linux-kernel@...r.kernel.org,
	hjk@...utronix.de, magnus.damm@...il.com
Subject: Re: [PATCH 1/2] UIO: add device clock support

On Wed, Jun 24, 2009 at 09:34:14AM -0700, Greg KH wrote:
> On Wed, Jun 24, 2009 at 05:30:24PM +0200, Daniel Mack wrote:
> > Add a pointer to a 'struct clk' to uio_info. Drivers can set
> > this pointer if a clock is needed, and the UIO core will care
> > to enable and disable it upon device open and release.
> 
> Do you have a UIO driver that needs this?
> 
> If so, please submit it at the same time, otherwise adding
> infrastructure for no driver that needs it, is pretty pointless.
> 
We can use this for the uio_pdrv_genirq case on sh, but open/release is a
bit coarse grained. Presently we default-enable clocks for devices that
are handled through uio, so doing it at open/release is at least better
than that. The other thing to consider is if we really want to add a
HAVE_CLK depdendency outright, or just ifdef around it..
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