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iio: adc: at91-sama5d2_adc: fix differential channels in triggered mode 

commit a500f3bd78 upstream.

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: 5e1a1da0f8 ("iio: adc: at91-sama5d2_adc: add hw trigger and buffer support")
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Eugen Hristev 2020-01-28 12:57:39 +00:00 committed by Greg Kroah-Hartman
parent 4d71a4f761
commit 7ad22950ca
1 changed files with 15 additions and 0 deletions
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15
drivers/iio/adc/at91-sama5d2_adc.c
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@ -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;
@ -731,6 +732,20 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
chan->type == IIO_PRESSURE)
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));