From cdbc8b99ad3b50dc1a5a8bfca3beb4f8e415e207 Mon Sep 17 00:00:00 2001 From: Antoniu Miclaus Date: Tue, 22 Apr 2025 11:55:29 +0300 Subject: [PATCH] iio: dac: ad7293: add adc reference configuration MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Nuno Sá Link: https://patch.msgid.link/20250422085529.4407-2-antoniu.miclaus@analog.com Signed-off-by: Jonathan Cameron --- drivers/iio/dac/ad7293.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) 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; } -- 2.20.1