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iio: dac: ad7293: add adc reference configuration

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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>
This commit is contained in:
Antoniu Miclaus 2025-04-22 11:55:29 +03:00 committed by Jonathan Cameron
parent 55d0392fb1
commit cdbc8b99ad
1 changed files with 13 additions and 0 deletions
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13
drivers/iio/dac/ad7293.c
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@ -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;
}