On Mon, 23 Mar 2020 10:42:19 +0000
<Eugen.Hristev@xxxxxxxxxxxxx> wrote:
> On 02.02.2020 13:02, Jonathan Cameron wrote:
> > On Tue, 28 Jan 2020 12:57:39 +0000
> > <Eugen.Hristev@xxxxxxxxxxxxx> wrote:
> >
> >> From: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
> >>
> >> The differential channels require writing the channel offset register (COR).
> >> Otherwise they do not work in differential mode.
> >> The configuration of COR is missing in triggered mode.
> >>
> >> Fixes: 5e1a1da0f8c9 ("iio: adc: at91-sama5d2_adc: add hw trigger and buffer support")
> >> Signed-off-by: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx>
> > Applied to the fixes-togreg branch of iio.git. Normally I avoid rebasing that
> > branch but I may do so this time given it's currently mid merge window.
> >
> > The other two patches will have to wait for this one to get upstream of
> > my togreg branch which will take a few weeks.
> >
> > Please give me a poke if I seem to have forgotten about them!
> >
>
> Poke !
Timings have gone badly this cycle I'm afraid, so whilst it's made it
into staging/staging-next, I'm not going to be rebasing togreg
until after a pull request to Greg KH. The timing issue was
I didn't get one out before staging most likely closed (one week
ahead of the window opening which it will probably do tomorrow).
So this will have to wait at least a few weeks more.
Sorry for the delay.
Jonathan
>
> Eugen
>
> > Thanks,
> >
> > Jonathan
> >
> >> ---
> >> Changes in v2:
> >> - moved to the start of the list
> >>
> >> drivers/iio/adc/at91-sama5d2_adc.c | 15 +++++++++++++++
> >> 1 file changed, 15 insertions(+)
> >>
> >> diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
> >> index e1850f3..2a6950a 100644
> >> --- a/drivers/iio/adc/at91-sama5d2_adc.c
> >> +++ b/drivers/iio/adc/at91-sama5d2_adc.c
> >> @@ -723,6 +723,7 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
> >>
> >> for_each_set_bit(bit, indio->active_scan_mask, indio->num_channels) {
> >> struct iio_chan_spec const *chan = at91_adc_chan_get(indio, bit);
> >> + u32 cor;
> >>
> >> if (!chan)
> >> continue;
> >> @@ -732,6 +733,20 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
> >> continue;
> >>
> >> if (state) {
> >> + cor = at91_adc_readl(st, AT91_SAMA5D2_COR);
> >> +
> >> + if (chan->differential)
> >> + cor |= (BIT(chan->channel) |
> >> + BIT(chan->channel2)) <<
> >> + AT91_SAMA5D2_COR_DIFF_OFFSET;
> >> + else
> >> + cor &= ~(BIT(chan->channel) <<
> >> + AT91_SAMA5D2_COR_DIFF_OFFSET);
> >> +
> >> + at91_adc_writel(st, AT91_SAMA5D2_COR, cor);
> >> + }
> >> +
> >> + if (state) {
> >> at91_adc_writel(st, AT91_SAMA5D2_CHER,
> >> BIT(chan->channel));
> >> /* enable irq only if not using DMA */
> >
>
