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This allows the GPIO driver to share the parent regmap and runtime power-management state. Reviewed-by: Bartosz Golaszewski Signed-off-by: Janani Sunil --- drivers/iio/adc/Kconfig | 1 + drivers/iio/adc/ad7768.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 30 insertions(+) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index c784bee0fd65..dea25315ed20 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -435,6 +435,7 @@ config AD7768 tristate "Analog Devices AD7768/AD7768-4 ADC driver" depends on SPI select REGULATOR + select AUXILIARY_BUS select IIO_BUFFER select IIO_BACKEND select REGMAP diff --git a/drivers/iio/adc/ad7768.c b/drivers/iio/adc/ad7768.c index 33b1b124d4d1..1fb14907b2b7 100644 --- a/drivers/iio/adc/ad7768.c +++ b/drivers/iio/adc/ad7768.c @@ -6,6 +6,7 @@ */ #include +#include #include #include #include @@ -1273,6 +1274,30 @@ static const struct iio_info ad7768_info = { .update_scan_mode = ad7768_update_scan_mode, }; +static int ad7768_gpio_adev_init(struct ad7768_state *st) +{ + struct device *dev = regmap_get_device(st->regmap); + struct spi_device *spi = to_spi_device(dev); + struct auxiliary_device *adev; + int id; + + if (!device_property_read_bool(dev, "gpio-controller")) + return 0; + + /* + * Use the SPI bus number and chip select to derive a stable per-device + * ID. + */ + id = (spi->controller->bus_num << 8) | spi_get_chipselect(spi, 0); + adev = __devm_auxiliary_device_create(dev, KBUILD_MODNAME, "gpio", + NULL, id); + if (!adev) + return dev_err_probe(dev, -ENODEV, + "Failed to create GPIO auxiliary device\n"); + + return 0; +} + static int ad7768_configure_precharge_buffers(struct iio_dev *indio_dev, struct ad7768_precharge_config *precharge_cfg) { @@ -1830,6 +1855,10 @@ static int ad7768_probe(struct spi_device *spi) return dev_err_probe(dev, ret, "Failed to register VCM regulator\n"); + ret = ad7768_gpio_adev_init(st); + if (ret) + return ret; + return devm_iio_device_register(dev, indio_dev); } -- 2.43.0