Re: [RFC][PATCH] Enable async suspend/resume of i2c devices

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On Thu, 7 Apr 2011 09:00:43 +0100, Mark Brown wrote:
> On Thu, Apr 07, 2011 at 09:55:13AM +0200, Jean Delvare wrote:
> > On Thu, 7 Apr 2011 07:31:24 +0900, Mark Brown wrote:
> 
> > > You definitely don't know *anything* about the relationships for I2C,
> > > especially in embedded systems.
> 
> > Can you please elaborate? The i2c subsystem uses a standard
> > parent-children relationship. It seems fairly similar to USB for
> > example. The only special case I can think of is with bus multiplexing,
> > but it would be easy enough to switch off async suspend/resume in this
> > case.
> 
> For I2C itself that's the case but for power and GPIO (which are very
> common in conjunction with I2C in the embedded context) we loose the
> tree.  This is much less of an issue with buses like PCI where
> everything is bundled into the bus.

Out of curiosity, how is this handled in the synchronous suspend/resume
case?

-- 
Jean Delvare
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