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iio: adc: adi-axi-adc: set data format

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Add support for selecting the data format within the AXI ADC ip.

Add separate complatible string for the custom AD485X IP and implement
the necessary changes.

Reviewed-by: Nuno Sa <nuno.sa@analog.com>
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250214131955.31973-7-antoniu.miclaus@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Antoniu Miclaus 2025-02-14 15:19:52 +02:00 committed by Jonathan Cameron
parent 4831509fd5
commit 7a794e3a0d
1 changed files with 77 additions and 1 deletions
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78
drivers/iio/adc/adi-axi-adc.c
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@ -46,6 +46,12 @@
#define ADI_AXI_ADC_REG_CTRL 0x0044
#define ADI_AXI_ADC_CTRL_DDR_EDGESEL_MASK BIT(1)
#define ADI_AXI_ADC_REG_CNTRL_3 0x004c
#define AXI_AD485X_CNTRL_3_PACKET_FORMAT_MSK GENMASK(1, 0)
#define AXI_AD485X_PACKET_FORMAT_20BIT 0x0
#define AXI_AD485X_PACKET_FORMAT_24BIT 0x1
#define AXI_AD485X_PACKET_FORMAT_32BIT 0x2
#define ADI_AXI_ADC_REG_DRP_STATUS 0x0074
#define ADI_AXI_ADC_DRP_LOCKED BIT(17)
@ -332,6 +338,47 @@ static int axi_adc_interface_type_get(struct iio_backend *back,
return 0;
}
static int axi_adc_ad485x_data_size_set(struct iio_backend *back,
unsigned int size)
{
struct adi_axi_adc_state *st = iio_backend_get_priv(back);
unsigned int val;
switch (size) {
/*
* There are two different variants of the AXI AXI_AD485X IP block, a
* 16-bit and a 20-bit variant.
* The 0x0 value (AXI_AD485X_PACKET_FORMAT_20BIT) is corresponding also
* to the 16-bit variant of the IP block.
*/
case 16:
case 20:
val = AXI_AD485X_PACKET_FORMAT_20BIT;
break;
case 24:
val = AXI_AD485X_PACKET_FORMAT_24BIT;
break;
/*
* The 0x2 (AXI_AD485X_PACKET_FORMAT_32BIT) corresponds only to the
* 20-bit variant of the IP block. Setting this value properly is
* ensured by the upper layers of the drivers calling the axi-adc
* functions.
* Also, for 16-bit IP block, the 0x2 (AXI_AD485X_PACKET_FORMAT_32BIT)
* value is handled as maximum size available which is 24-bit for this
* configuration.
*/
case 32:
val = AXI_AD485X_PACKET_FORMAT_32BIT;
break;
default:
return -EINVAL;
}
return regmap_update_bits(st->regmap, ADI_AXI_ADC_REG_CNTRL_3,
AXI_AD485X_CNTRL_3_PACKET_FORMAT_MSK,
FIELD_PREP(AXI_AD485X_CNTRL_3_PACKET_FORMAT_MSK, val));
}
static struct iio_buffer *axi_adc_request_buffer(struct iio_backend *back,
struct iio_dev *indio_dev)
{
@ -488,6 +535,29 @@ static const struct iio_backend_info adi_axi_adc_generic = {
.ops = &adi_axi_adc_ops,
};
static const struct iio_backend_ops adi_ad485x_ops = {
.enable = axi_adc_enable,
.disable = axi_adc_disable,
.data_format_set = axi_adc_data_format_set,
.chan_enable = axi_adc_chan_enable,
.chan_disable = axi_adc_chan_disable,
.request_buffer = axi_adc_request_buffer,
.free_buffer = axi_adc_free_buffer,
.data_sample_trigger = axi_adc_data_sample_trigger,
.iodelay_set = axi_adc_iodelays_set,
.chan_status = axi_adc_chan_status,
.interface_type_get = axi_adc_interface_type_get,
.data_size_set = axi_adc_ad485x_data_size_set,
.debugfs_reg_access = iio_backend_debugfs_ptr(axi_adc_reg_access),
.debugfs_print_chan_status =
iio_backend_debugfs_ptr(axi_adc_debugfs_print_chan_status),
};
static const struct iio_backend_info axi_ad485x = {
.name = "axi-ad485x",
.ops = &adi_ad485x_ops,
};
static int adi_axi_adc_probe(struct platform_device *pdev)
{
struct adi_axi_adc_state *st;
@ -545,7 +615,7 @@ static int adi_axi_adc_probe(struct platform_device *pdev)
return -ENODEV;
}
ret = devm_iio_backend_register(&pdev->dev, &adi_axi_adc_generic, st);
ret = devm_iio_backend_register(&pdev->dev, st->info->backend_info, st);
if (ret)
return dev_err_probe(&pdev->dev, ret,
"failed to register iio backend\n");
@ -585,6 +655,11 @@ static const struct axi_adc_info adc_generic = {
.backend_info = &adi_axi_adc_generic,
};
static const struct axi_adc_info adi_axi_ad485x = {
.version = ADI_AXI_PCORE_VER(10, 0, 'a'),
.backend_info = &axi_ad485x,
};
static const struct ad7606_platform_data ad7606_pdata = {
.bus_reg_read = ad7606_bus_reg_read,
.bus_reg_write = ad7606_bus_reg_write,
@ -601,6 +676,7 @@ static const struct axi_adc_info adc_ad7606 = {
/* Match table for of_platform binding */
static const struct of_device_id adi_axi_adc_of_match[] = {
{ .compatible = "adi,axi-adc-10.0.a", .data = &adc_generic },
{ .compatible = "adi,axi-ad485x", .data = &adi_axi_ad485x },
{ .compatible = "adi,axi-ad7606x", .data = &adc_ad7606 },
{ /* end of list */ }
};