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From: "Sricharan" <sricharan@codeaurora.org>
To: "'Michael Welling'" <mwelling@ieee.org>
Cc: "'Daniel Baluta'" <daniel.baluta@intel.com>,
	"'Wolfram Sang'" <wsa@the-dreams.de>,
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References: <CAEnQRZAjgn3Y0618MgO284DMc_9cE49b9jeUr0j2HwUK6YK+0A@mail.gmail.com> <20160206003245.GA1329@deathstar> <20160208102459.GC2220@tetsubishi> <20160208163632.GA3630@deathstar> <01fd01d162a4$8e28c450$aa7a4cf0$@codeaurora.org> <20160208191658.GA23145@deathstar> <001b01d163fd$bfb15280$3f13f780$@codeaurora.org> <CAEnQRZCzkq5wFsS7Ydby+bsFJTbGVq=AX9TLkkhfMKOG8gAZHA@mail.gmail.com> <003201d16415$0eb1a8f0$2c14fad0$@codeaurora.org> <20160210163622.GA1390@deathstar> <20160217235314.GA13145@deathstar>
In-Reply-To: <20160217235314.GA13145@deathstar>
Subject: RE: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support
Date: Thu, 18 Feb 2016 14:15:42 +0530
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Hi,

> On Wed, Feb 10, 2016 at 10:36:22AM -0600, Michael Welling wrote:
> > On Wed, Feb 10, 2016 at 08:39:04PM +0530, Sricharan wrote:
> > > > Hi Sricharan,
> > > >
> > > > Are you looking at pca9685_pwm_probe in drivers/pwm/pwm-
> pca9685.c
> > > > right?
> > > >
> > >  Yes.
> > >
> > > > I'm asking this because this driver doesn't seem to support
> > > > runtime pm and there is no check for regmap_write/regmap_write
> > > > return code in the probe function.
> > >    Hmm to be clear, so it’s the pm_runtime_getsync from i2c-qup which
> fails right ?
> > >    I was tracking that when there are i2c_xfers from pwm. I did not see
> any failures there.
> > >    So wanted to know the correct sequence to reproduce.
> > >
> >
> > The problem was discovered using the patch that this thread is on. The
> > PWM driver does not have the problem.
> >
> > When the driver in this patch called pm_runtime_get_sync you got -EINVAL
> back.
> 
> I noticed some patches for the QUP I2C driver in linux-next so I built against
> it.
> 
> The ADC driver now appears to work as desired.
> 
   Ok, I suppose those were changes merged last week to add qup V2 tags support, but
   not sure how that is helping to solve the pm_runtime issue here. 

Regards,
  Sricharan