diff options
| author | Antoniu Miclaus <antoniu.miclaus@analog.com> | 2025-04-22 11:55:29 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2025-05-21 14:20:29 +0100 |
| commit | cdbc8b99ad3b50dc1a5a8bfca3beb4f8e415e207 (patch) | |
| tree | b34b3590c3cb6acfa48a7dddcafbde8744212c17 | |
| parent | 55d0392fb177307d99cc5e5b9d1234413f0e7cb1 (diff) | |
iio: dac: ad7293: add adc reference configuration
Add support for configurating the ADC reference (internal/external).
According to the datasheet, the external reference is enabled by
default.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://patch.msgid.link/20250422085529.4407-2-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
| -rw-r--r-- | drivers/iio/dac/ad7293.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/iio/dac/ad7293.c b/drivers/iio/dac/ad7293.c index 99fa2d1f8299..c3797e40cdd9 100644 --- a/drivers/iio/dac/ad7293.c +++ b/drivers/iio/dac/ad7293.c @@ -114,6 +114,7 @@ #define AD7293_REG_DATA_RAW_MSK GENMASK(15, 4) #define AD7293_REG_VINX_RANGE_GET_CH_MSK(x, ch) (((x) >> (ch)) & 0x1) #define AD7293_REG_VINX_RANGE_SET_CH_MSK(x, ch) (((x) & 0x1) << (ch)) +#define AD7293_GENERAL_ADC_REF_MSK BIT(7) #define AD7293_CHIP_ID 0x18 enum ad7293_ch_type { @@ -141,6 +142,7 @@ struct ad7293_state { /* Protect against concurrent accesses to the device, page selection and data content */ struct mutex lock; struct gpio_desc *gpio_reset; + bool vrefin_en; u8 page_select; u8 data[3] __aligned(IIO_DMA_MINALIGN); }; @@ -785,6 +787,12 @@ static int ad7293_properties_parse(struct ad7293_state *st) if (ret) return dev_err_probe(&spi->dev, ret, "failed to enable VDRIVE\n"); + ret = devm_regulator_get_enable_optional(&spi->dev, "vrefin"); + if (ret < 0 && ret != -ENODEV) + return dev_err_probe(&spi->dev, ret, "failed to enable VREFIN\n"); + + st->vrefin_en = ret != -ENODEV; + st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(st->gpio_reset)) @@ -818,6 +826,11 @@ static int ad7293_init(struct ad7293_state *st) return -EINVAL; } + if (!st->vrefin_en) + return __ad7293_spi_update_bits(st, AD7293_REG_GENERAL, + AD7293_GENERAL_ADC_REF_MSK, + AD7293_GENERAL_ADC_REF_MSK); + return 0; } |