This is a note to let you know that I've just added the patch titled

iio: adc: ad7380: fix supplies for ad7380-4

to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 05f9c67179c9a8d66dee175fb4b17f380908a26f Mon Sep 17 00:00:00 2001 From: Julien Stephan jstephan@baylibre.com Date: Tue, 22 Oct 2024 15:22:39 +0200 Subject: iio: adc: ad7380: fix supplies for ad7380-4

ad7380-4 is the only device in the family that does not have an internal reference. It uses "refin" as a required external reference. All other devices in the family use "refio"" as an optional external reference.

Fixes: 737413da8704 ("iio: adc: ad7380: add support for ad738x-4 4 channels variants") Reviewed-by: Nuno Sa nuno.sa@analog.com Reviewed-by: David Lechner dlechner@baylibre.com Signed-off-by: Julien Stephan jstephan@baylibre.com Link: https://patch.msgid.link/20241022-ad7380-fix-supplies-v3-4-f0cefe1b7fa6@bayl... Cc: Stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/adc/ad7380.c | 36 ++++++++++++++++++++++++++---------- 1 file changed, 26 insertions(+), 10 deletions(-)

diff --git a/drivers/iio/adc/ad7380.c b/drivers/iio/adc/ad7380.c index b107d8e97ab3..fb728570debe 100644 --- a/drivers/iio/adc/ad7380.c +++ b/drivers/iio/adc/ad7380.c @@ -89,6 +89,7 @@ struct ad7380_chip_info { bool has_mux; const char * const *supplies; unsigned int num_supplies; + bool external_ref_only; const char * const *vcm_supplies; unsigned int num_vcm_supplies; const unsigned long *available_scan_masks; @@ -431,6 +432,7 @@ static const struct ad7380_chip_info ad7380_4_chip_info = { .num_simult_channels = 4, .supplies = ad7380_supplies, .num_supplies = ARRAY_SIZE(ad7380_supplies), + .external_ref_only = true, .available_scan_masks = ad7380_4_channel_scan_masks, .timing_specs = &ad7380_4_timing, }; @@ -1047,17 +1049,31 @@ static int ad7380_probe(struct spi_device *spi) "Failed to enable power supplies\n"); fsleep(T_POWERUP_US);

- /* - * If there is no REFIO supply, then it means that we are using - * the internal 2.5V reference, otherwise REFIO is reference voltage. - */ - ret = devm_regulator_get_enable_read_voltage(&spi->dev, "refio"); - if (ret < 0 && ret != -ENODEV) - return dev_err_probe(&spi->dev, ret, - "Failed to get refio regulator\n"); + if (st->chip_info->external_ref_only) { + ret = devm_regulator_get_enable_read_voltage(&spi->dev, + "refin"); + if (ret < 0) + return dev_err_probe(&spi->dev, ret, + "Failed to get refin regulator\n");

- external_ref_en = ret != -ENODEV; - st->vref_mv = external_ref_en ? ret / 1000 : AD7380_INTERNAL_REF_MV; + st->vref_mv = ret / 1000; + + /* these chips don't have a register bit for this */ + external_ref_en = false; + } else { + /* + * If there is no REFIO supply, then it means that we are using + * the internal reference, otherwise REFIO is reference voltage. + */ + ret = devm_regulator_get_enable_read_voltage(&spi->dev, + "refio"); + if (ret < 0 && ret != -ENODEV) + return dev_err_probe(&spi->dev, ret, + "Failed to get refio regulator\n"); + + external_ref_en = ret != -ENODEV; + st->vref_mv = external_ref_en ? ret / 1000 : AD7380_INTERNAL_REF_MV; + }

if (st->chip_info->num_vcm_supplies > ARRAY_SIZE(st->vcm_mv)) return dev_err_probe(&spi->dev, -EINVAL,