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For these users, let the driver work in standalone mode, not coupled to the backend or the services it provides. Signed-off-by: Tomas Melin --- drivers/iio/adc/ad9467.c | 37 +++++++++++++++++++++++++------------ 1 file changed, 25 insertions(+), 12 deletions(-) diff --git a/drivers/iio/adc/ad9467.c b/drivers/iio/adc/ad9467.c index 60fc3361b2689a4c38287c613ef93fe00338e5fa..37b8f88da6681d44f3fbbb6c8c1= 71ae7117b9090 100644 --- a/drivers/iio/adc/ad9467.c +++ b/drivers/iio/adc/ad9467.c @@ -1000,6 +1000,9 @@ static int ad9467_update_scan_mode(struct iio_dev *in= dio_dev, unsigned int c; int ret; =20 + if (!st->back) + return -EOPNOTSUPP; + for (c =3D 0; c < st->info->num_channels; c++) { if (test_bit(c, scan_mask)) ret =3D iio_backend_chan_enable(st->back, c); @@ -1066,6 +1069,7 @@ static int ad9467_iio_backend_get(struct ad9467_state= *st) { struct device *dev =3D &st->spi->dev; struct device_node *__back; + unsigned int nr_nodes =3D 0; =20 st->back =3D devm_iio_backend_get(dev, NULL); if (!IS_ERR(st->back)) @@ -1084,6 +1088,7 @@ static int ad9467_iio_backend_get(struct ad9467_state= *st) for_each_node_with_property(__back, "adi,adc-dev") { struct device_node *__me; =20 + nr_nodes++; __me =3D of_parse_phandle(__back, "adi,adc-dev", 0); if (!__me) continue; @@ -1100,6 +1105,10 @@ static int ad9467_iio_backend_get(struct ad9467_stat= e *st) return PTR_ERR_OR_ZERO(st->back); } =20 + st->back =3D NULL; + if (!nr_nodes) + return -ENOENT; + return -ENODEV; } =20 @@ -1294,8 +1303,8 @@ static void ad9467_debugfs_init(struct iio_dev *indio= _dev) =20 debugfs_create_file("in_voltage_test_mode_available", 0400, d, st, &ad9467_test_mode_available_fops); - - iio_backend_debugfs_add(st->back, indio_dev); + if (st->back) + iio_backend_debugfs_add(st->back, indio_dev); } =20 static int ad9467_probe(struct spi_device *spi) @@ -1352,21 +1361,25 @@ static int ad9467_probe(struct spi_device *spi) indio_dev->channels =3D st->info->channels; indio_dev->num_channels =3D st->info->num_channels; =20 + /* Using a backend is optional */ ret =3D ad9467_iio_backend_get(st); - if (ret) + if (ret && ret !=3D -ENOENT) return ret; =20 - ret =3D devm_iio_backend_request_buffer(&spi->dev, st->back, indio_dev); - if (ret) - return ret; + if (!ret) { + ret =3D devm_iio_backend_request_buffer(&spi->dev, st->back, + indio_dev); + if (ret) + return ret; =20 - ret =3D devm_iio_backend_enable(&spi->dev, st->back); - if (ret) - return ret; + ret =3D devm_iio_backend_enable(&spi->dev, st->back); + if (ret) + return ret; =20 - ret =3D ad9467_calibrate(st); - if (ret) - return ret; + ret =3D ad9467_calibrate(st); + if (ret) + return ret; + } =20 ret =3D devm_iio_device_register(&spi->dev, indio_dev); if (ret) --=20 2.47.3