[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <20160208191658.GA23145@deathstar>
Date: Mon, 8 Feb 2016 13:16:58 -0600
From: Michael Welling <mwelling@...e.org>
To: Sricharan <sricharan@...eaurora.org>
Cc: 'Wolfram Sang' <wsa@...-dreams.de>,
'Daniel Baluta' <daniel.baluta@...el.com>,
'Jonathan Cameron' <jic23@...nel.org>,
'Hartmut Knaack' <knaack.h@....de>,
'Lars-Peter Clausen' <lars@...afoo.de>,
'Peter Meerwald-Stadler' <pmeerw@...erw.net>,
'Linux Kernel Mailing List' <linux-kernel@...r.kernel.org>,
linux-iio@...r.kernel.org,
'Lucas De Marchi' <lucas.demarchi@...el.com>,
'Andy Gross' <agross@...eaurora.org>,
'Pramod Gurav' <pramod.gurav@...rtplayin.com>,
'Bjorn Andersson' <bjorn.andersson@...ymobile.com>,
'Guenter Roeck' <linux@...ck-us.net>, eibach@...ys.de,
linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support
On Tue, Feb 09, 2016 at 12:41:35AM +0530, Sricharan wrote:
> Hi,
>
> > -----Original Message-----
> > From: Michael Welling [mailto:mwelling79@...il.com] On Behalf Of Michael
> > Welling
> > Sent: Monday, February 08, 2016 10:07 PM
> > To: Wolfram Sang
> > Cc: Daniel Baluta; Jonathan Cameron; Hartmut Knaack; Lars-Peter Clausen;
> > Peter Meerwald-Stadler; Linux Kernel Mailing List;
> linux-iio@...r.kernel.org;
> > Lucas De Marchi; Andy Gross; Pramod Gurav; Bjorn Andersson; Guenter
> > Roeck; eibach@...ys.de; Sricharan R; linux-arm-msm@...r.kernel.org
> > Subject: Re: [PATCH v4] iio: adc: Add TI ADS1015 ADC driver support
> >
> > On Mon, Feb 08, 2016 at 11:25:00AM +0100, Wolfram Sang wrote:
> > > On Fri, Feb 05, 2016 at 06:32:45PM -0600, Michael Welling wrote:
> > > > On Fri, Feb 05, 2016 at 09:32:34PM +0200, Daniel Baluta wrote:
> > > > > >> +static int ads1015_read_raw(struct iio_dev *indio_dev,
> > > > > >> + struct iio_chan_spec const *chan, int
> *val,
> > > > > >> + int *val2, long mask) {
> > > > > >> + int ret, idx;
> > > > > >> + struct ads1015_data *data = iio_priv(indio_dev);
> > > > > >> +
> > > > > >> + mutex_lock(&data->lock);
> > > > > >> + switch (mask) {
> > > > > >> + case IIO_CHAN_INFO_RAW:
> > > > > >> + if (iio_buffer_enabled(indio_dev)) {
> > > > > >> + ret = -EBUSY;
> > > > > >> + break;
> > > > > >> + }
> > > > > >> +
> > > > > >> + ret = ads1015_set_power_state(data, true);
> > > > > >> + if (ret < 0)
> > > > > >> + break;
> > > > > >
> > > > > > Just tested the driver on a Dragonboard 410C with a robotics
> > > > > > mezzanine that I designed.
> > > > > >
> > > > > > The above ads1015_set_power_state(data, true) is always returning
> -
> > EINVAL.
> > > > > >
> > > > > > Any ideas why that would be happening?
> > > > > > I think it may be the return from pm_runtime_get_sync?
> > > > >
> > > > > Can you confirm that pm_runtime_get_sync fails? Using some printk?
> > > > >
> > > > > Also adding printks in suspend/resume function would be helpful.
> > > > > Do you have CONFIG_PM enabled?
> > > > >
> > > >
> > > > Indeed it is the pm_runtime_get_sync that fails with a -EINVAL.
> > > >
> > > > > >
> > > > > > When I comment out the break the readings come back but are not
> > updated continually.
> > > > > > If I read in_voltage0-voltage1_raw then in_voltage0_raw the value
> is
> > updated.
> > > > >
> > > > > I guess this is normal if set_power_state fails.
> > > >
> > > > The hwmod driver works fine BTW.
> > > >
> > > > My guess is there is an issue with the qup i2c driver seeing as it
> > > > has worked on other system without issue.
> > > >
> > > > CC'd some the latest developer on the qup i2c driver.
> > > >
> > > > I2C guys have any ideas on this?
> > > >
> > >
> > > Adding some more people who recently worked on this. Might be nice to
> > > know which kernel version you are using.
> > >
> Which i2c bus is this connected to ? I can give a try with 410c to see why
> pm_runtime_get_sync from qup
> fails.
It is on the lowspeed header. Here is my devicetree entry:
i2c@...6000 {
/* On Low speed expansion */
label = "LS-I2C0";
status = "okay";
pca: pca@40 {
compatible = "nxp,pca9685-pwm";
#pwm-cells = <2>;
reg = <0x40>;
};
adc: adc@48 {
compatible = "ti,ads1015";
reg = <0x48>;
};
};
>
> Regards,
> Sricharan
>
>
>
Powered by blists - more mailing lists