iio: adc: ad7476: Add IIO_CHAN_INFO_RAW for AD7091R

When CONVST signal is generated internally, IIO_CHAN_INFO_RAW can be
made available for AD7091R for single reads. This patch enables it and
makes supporting more devices by this driver easier.

Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com>
Signed-off-by: Beniamin Bia <beniamin.bia@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c
index 32e857d..3b48073 100644 (file)
--- a/drivers/iio/adc/ad7476.c
+++ b/drivers/iio/adc/ad7476.c
@@ -29,6 +29,8 @@ struct ad7476_state;
 struct ad7476_chip_info {
        unsigned int                    int_vref_uv;
        struct iio_chan_spec            channel[2];
+       /* channels used when convst gpio is defined */
+       struct iio_chan_spec            convst_channel[2];
        void (*reset)(struct ad7476_state *);
 };
 
@@ -109,6 +111,8 @@ static int ad7476_scan_direct(struct ad7476_state *st)
 {
        int ret;
 
+       ad7091_convst(st);
+
        ret = spi_sync(st->spi, &st->msg);
        if (ret)
                return ret;
@@ -176,6 +180,8 @@ static int ad7476_read_raw(struct iio_dev *indio_dev,
 #define AD7940_CHAN(bits) _AD7476_CHAN((bits), 15 - (bits), \
                BIT(IIO_CHAN_INFO_RAW))
 #define AD7091R_CHAN(bits) _AD7476_CHAN((bits), 16 - (bits), 0)
+#define AD7091R_CONVST_CHAN(bits) _AD7476_CHAN((bits), 16 - (bits), \
+               BIT(IIO_CHAN_INFO_RAW))
 #define ADS786X_CHAN(bits) _AD7476_CHAN((bits), 12 - (bits), \
                BIT(IIO_CHAN_INFO_RAW))
 
@@ -183,6 +189,8 @@ static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
        [ID_AD7091R] = {
                .channel[0] = AD7091R_CHAN(12),
                .channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+               .convst_channel[0] = AD7091R_CONVST_CHAN(12),
+               .convst_channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
                .reset = ad7091_reset,
        },
        [ID_AD7276] = {
@@ -288,6 +296,9 @@ static int ad7476_probe(struct spi_device *spi)
        indio_dev->channels = st->chip_info->channel;
        indio_dev->num_channels = 2;
        indio_dev->info = &ad7476_info;
+
+       if (st->convst_gpio && st->chip_info->convst_channel)
+               indio_dev->channels = st->chip_info->convst_channel;
        /* Setup default message */
 
        st->xfer.rx_buf = &st->data;