github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-28 01:55:51 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

iio: adc: sun20i-gpadc: support non-contiguous channel lookups

Browse Source 
Using consumer driver like iio-hwmon which resolve channels through
io-channels phandles will fail for sparse channels because IIO core by
default treats phandle argument as index into channel array.
        eg. <&gpadc 1> will fail if there is only channel@1 specified

Add .fwnode_xlate() which maps DT phandle to the registered channel
whose chan->channel matches the hardware channel number. It allows
sparse channel maps to be consumed by drivers like iio-hwmon.

Tested on Radxa Cubie A5E.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Michal Piekos <michal.piekos@mmpsystems.pl>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Michal Piekos 2026-05-16 07:48:37 +02:00 committed by Jonathan Cameron
parent 8114f44203
commit 44f38b4629
1 changed files with 15 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
drivers/iio/adc/sun20i-gpadc-iio.c
View File

@ -139,8 +139,23 @@ static irqreturn_t sun20i_gpadc_irq_handler(int irq, void *data)
return IRQ_HANDLED;
}
static int
sun20i_gpadc_fwnode_xlate(struct iio_dev *indio_dev,
const struct fwnode_reference_args *iiospec)
{
if (iiospec->nargs != 1)
return -EINVAL;
for (unsigned int i = 0; i < indio_dev->num_channels; i++)
if (indio_dev->channels[i].channel == iiospec->args[0])
return i;
return -EINVAL;
}
static const struct iio_info sun20i_gpadc_iio_info = {
.read_raw = sun20i_gpadc_read_raw,
.fwnode_xlate = sun20i_gpadc_fwnode_xlate,
};
static void sun20i_gpadc_reset_assert(void *data)