Re: [PATCH 6/7] iio: mlx90614: Add power management

[Wolfram Sang <wsa-z923LK4zBo2bacvFa/9K2g@public.gmane.org>]

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On Mon, Mar 09, 2015 at 03:39:35PM +0000, Jonathan Cameron wrote:
> On 25/02/15 15:55, Vianney le Clément de Saint-Marcq wrote:
> > Add support for system sleep and runtime power management.
> > 
> > To wake up the device, the SDA line should be held low for at least 33ms
> > while SCL is high.  As this is not possible using the i2c API (and not
> > supported by all i2c adapters), a GPIO connected to the SDA line is
> > needed.  The GPIO is named "wakeup" and can be specified in a device
> > tree with the "wakeup-gpios" binding.
> Needs some i2c specialist input on this!  As you mentioned it is liable
> to be controversial.  Wolfram, is this a one off special or do
> any other devices do this sort of magic?

s/magic/insanity/ :)

I have never heard of something like this. Unsuprisingly, I can
not recommend doing it this way. But we all know hardware...

And while we could think about reusing the bus_recovery_infrastructure,
I don't think it is worth the hazzle. So, doing this GPIO fallback may
well be the best we can do now.


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