lkml.org 
[lkml]   [2009]   [May]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] w1-gpio: add external pull-up enable callback
On Wed, May 06, 2009 at 12:33:07PM +0300, Ville Syrjälä wrote:
> On Tue, May 05, 2009 at 02:43:33PM +0200, Daniel Mack wrote:
> > On embedded devices, sleep mode conditions can be tricky to handle,
> > Especially when processors tend to pull-down the w1 bus during sleep.
> > Bus slaves (such as the ds2760) may interpret this as a reason for
> > power-down conditions and entirely switch off the device.
> >
> > This patch adds a callback function pointer to let users switch on and
> > off the external pull-up resistor. This lets the outside world know
> > whether the processor is currently actively driving the bus or not.
>
> Looks simple enough but I wonder if you could just do this from the
> platform code. I suppose the downside would be that you would enable the
> pullup even if w1-gpio is not loaded.

That's right. Hence I put it where I believe it belongs to.

Thanks,
Daniel
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2009-05-06 11:37    [W:0.070 / U:22.524 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site