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iio: dac: bd79703: Support BD79700 and BD79701

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The BD79700 and BD79701 look like almost exact subsets of the BD79703.
The BD79703 contains 6 channels (channels 0 to 5). The BD79700 provides
only 2 channels, matching the BD79703 channels 0 and 1. The BD79701
provides 3 channels (matching BD79703 channels 0, 1, and 2).

Furthermore, the BD79700 and BD79701 do not have separate VFS pin but
use VCC for the full-scale voltage.

Suopport these ICs using the BD79703 driver.

Signed-off-by: Matti Vaittinen <mazziesaccount@gmail.com>
Link: https://patch.msgid.link/845aa45974f6fb81c83046368a24a0674e9a8b0e.1743576022.git.mazziesaccount@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Matti Vaittinen
2025-04-02 09:46:30 +03:00
committed by Jonathan Cameron
parent 67c318c46c
commit 25468dbb81
1 changed files with 48 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
drivers/iio/dac/rohm-bd79703.c
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@@ -49,6 +49,7 @@ struct bd7970x_chip_data {
const char *name;
const struct iio_chan_spec *channels;
int num_channels;
bool has_vfs;
};
static int bd79703_read_raw(struct iio_dev *idev,
@@ -93,6 +94,17 @@ static const struct iio_info bd79703_info = {
.address = (_chan + 1), \
}
static const struct iio_chan_spec bd79700_channels[] = {
BD79703_CHAN(0),
BD79703_CHAN(1),
};
static const struct iio_chan_spec bd79701_channels[] = {
BD79703_CHAN(0),
BD79703_CHAN(1),
BD79703_CHAN(2),
};
static const struct iio_chan_spec bd79703_channels[] = {
BD79703_CHAN(0),
BD79703_CHAN(1),
@@ -102,10 +114,25 @@ static const struct iio_chan_spec bd79703_channels[] = {
BD79703_CHAN(5),
};
static const struct bd7970x_chip_data bd79700_chip_data = {
.name = "bd79700",
.channels = bd79700_channels,
.num_channels = ARRAY_SIZE(bd79700_channels),
.has_vfs = false,
};
static const struct bd7970x_chip_data bd79701_chip_data = {
.name = "bd79701",
.channels = bd79701_channels,
.num_channels = ARRAY_SIZE(bd79701_channels),
.has_vfs = false,
};
static const struct bd7970x_chip_data bd79703_chip_data = {
.name = "bd79703",
.channels = bd79703_channels,
.num_channels = ARRAY_SIZE(bd79703_channels),
.has_vfs = true,
};
static int bd79703_probe(struct spi_device *spi)
@@ -131,15 +158,25 @@ static int bd79703_probe(struct spi_device *spi)
return dev_err_probe(dev, PTR_ERR(data->regmap),
"Failed to initialize Regmap\n");
ret = devm_regulator_get_enable(dev, "vcc");
if (ret)
return dev_err_probe(dev, ret, "Failed to enable VCC\n");
ret = devm_regulator_get_enable_read_voltage(dev, "vfs");
if (ret < 0)
return dev_err_probe(dev, ret, "Failed to get Vfs\n");
/*
* BD79703 has a separate VFS pin, whereas the BD79700 and BD79701 use
* VCC for their full-scale output voltage.
*/
if (cd->has_vfs) {
ret = devm_regulator_get_enable(dev, "vcc");
if (ret)
return dev_err_probe(dev, ret, "Failed to enable VCC\n");
ret = devm_regulator_get_enable_read_voltage(dev, "vfs");
if (ret < 0)
return dev_err_probe(dev, ret, "Failed to get Vfs\n");
} else {
ret = devm_regulator_get_enable_read_voltage(dev, "vcc");
if (ret < 0)
return dev_err_probe(dev, ret, "Failed to get VCC\n");
}
data->vfs = ret;
idev->channels = cd->channels;
idev->num_channels = cd->num_channels;
idev->modes = INDIO_DIRECT_MODE;
@@ -155,12 +192,16 @@ static int bd79703_probe(struct spi_device *spi)
}
static const struct spi_device_id bd79703_id[] = {
{ "bd79700", (kernel_ulong_t)&bd79700_chip_data },
{ "bd79701", (kernel_ulong_t)&bd79701_chip_data },
{ "bd79703", (kernel_ulong_t)&bd79703_chip_data },
{ }
};
MODULE_DEVICE_TABLE(spi, bd79703_id);
static const struct of_device_id bd79703_of_match[] = {
{ .compatible = "rohm,bd79700", .data = &bd79700_chip_data },
{ .compatible = "rohm,bd79701", .data = &bd79701_chip_data },
{ .compatible = "rohm,bd79703", .data = &bd79703_chip_data },
{ }
};