Commit 7a794e3a authored by Antoniu Miclaus's avatar Antoniu Miclaus Committed by Jonathan Cameron
Browse files

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



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: default avatarNuno Sa <nuno.sa@analog.com>
Signed-off-by: default avatarAntoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://patch.msgid.link/20250214131955.31973-7-antoniu.miclaus@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 4831509f

drivers/iio/adc/adi-axi-adc.c

+77 −1
Original line number Diff line number Diff line
@@ -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 */ }

};