[PATCH v2 2/2] iio: adc: ad7173: add support for ad4113

[Dumitru Ceclan via B4 Relay <devnull+dumitru.ceclan.analog.com@kernel.org>]

From: Dumitru Ceclan <dumitru.ceclan@analog.com>

This commit adds support for the AD4113 ADC.
The AD4113 is a low power, low noise, 16-bit, Σ-Δ analog-to-digital
converter (ADC) that integrates an analog front end (AFE) for four
fully differential or eight single-ended inputs.

Signed-off-by: Dumitru Ceclan <dumitru.ceclan@analog.com>
---
 drivers/iio/adc/ad7173.c | 36 +++++++++++++++++++++++++++++++++++-
 1 file changed, 35 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
index a854f2d30174..3ac09d326472 100644
--- a/drivers/iio/adc/ad7173.c
+++ b/drivers/iio/adc/ad7173.c
@@ -3,7 +3,7 @@
  * AD717x and AD411x family SPI ADC driver
  *
  * Supported devices:
- *  AD4111/AD4112/AD4114/AD4115/AD4116
+ *  AD4111/AD4112/AD4113/AD4114/AD4115/AD4116
  *  AD7172-2/AD7172-4/AD7173-8/AD7175-2
  *  AD7175-8/AD7176-2/AD7177-2
  *
@@ -84,6 +84,7 @@
 #define AD4111_ID			AD7173_ID
 #define AD4112_ID			AD7173_ID
 #define AD4114_ID			AD7173_ID
+#define AD4113_ID			0x31D0
 #define AD4116_ID			0x34d0
 #define AD4115_ID			0x38d0
 #define AD7175_8_ID			0x3cd0
@@ -170,6 +171,7 @@ struct ad7173_device_info {
 	bool has_temp;
 	/* ((AVDD1 − AVSS)/5) */
 	bool has_pow_supply_monitoring;
+	bool data_reg_only_16bit;
 	bool has_input_buf;
 	bool has_int_ref;
 	bool has_ref2;
@@ -294,6 +296,24 @@ static const struct ad7173_device_info ad4112_device_info = {
 	.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
 };
 
+static const struct ad7173_device_info ad4113_device_info = {
+	.name = "ad4113",
+	.id = AD4113_ID,
+	.num_voltage_in_div = 8,
+	.num_channels = 16,
+	.num_configs = 8,
+	.num_voltage_in = 8,
+	.num_gpios = 2,
+	.data_reg_only_16bit = true,
+	.higher_gpio_bits = true,
+	.has_vincom_input = true,
+	.has_input_buf = true,
+	.has_int_ref = true,
+	.clock = 2 * HZ_PER_MHZ,
+	.sinc5_data_rates = ad7173_sinc5_data_rates,
+	.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
+};
+
 static const struct ad7173_device_info ad4114_device_info = {
 	.name = "ad4114",
 	.id = AD4114_ID,
@@ -988,6 +1008,13 @@ static const struct iio_info ad7173_info = {
 	.update_scan_mode = ad7173_update_scan_mode,
 };
 
+static const struct iio_scan_type ad4113_scan_type = {
+	.sign = 'u',
+	.realbits = 16,
+	.storagebits = 16,
+	.endianness = IIO_BE,
+};
+
 static const struct iio_chan_spec ad7173_channel_template = {
 	.type = IIO_VOLTAGE,
 	.indexed = 1,
@@ -1229,6 +1256,8 @@ static int ad7173_fw_parse_channel_config(struct iio_dev *indio_dev)
 		chan_st_priv->cfg.input_buf = st->info->has_input_buf;
 		chan_st_priv->cfg.ref_sel = AD7173_SETUP_REF_SEL_INT_REF;
 		st->adc_mode |= AD7173_ADC_MODE_REF_EN;
+		if (st->info->data_reg_only_16bit)
+			chan_arr[chan_index].scan_type = ad4113_scan_type;
 
 		chan_index++;
 	}
@@ -1309,6 +1338,9 @@ static int ad7173_fw_parse_channel_config(struct iio_dev *indio_dev)
 			chan_st_priv->ain = AD7173_CH_ADDRESS(ain[0], ain[1]);
 		}
 
+		if (st->info->data_reg_only_16bit)
+			chan_arr[chan_index].scan_type = ad4113_scan_type;
+
 		chan_index++;
 	}
 	return 0;
@@ -1437,6 +1469,7 @@ static int ad7173_probe(struct spi_device *spi)
 static const struct of_device_id ad7173_of_match[] = {
 	{ .compatible = "adi,ad4111",	.data = &ad4111_device_info },
 	{ .compatible = "adi,ad4112",	.data = &ad4112_device_info },
+	{ .compatible = "adi,ad4113",	.data = &ad4113_device_info },
 	{ .compatible = "adi,ad4114",	.data = &ad4114_device_info },
 	{ .compatible = "adi,ad4115",	.data = &ad4115_device_info },
 	{ .compatible = "adi,ad4116",	.data = &ad4116_device_info },
@@ -1454,6 +1487,7 @@ MODULE_DEVICE_TABLE(of, ad7173_of_match);
 static const struct spi_device_id ad7173_id_table[] = {
 	{ "ad4111",   (kernel_ulong_t)&ad4111_device_info },
 	{ "ad4112",   (kernel_ulong_t)&ad4112_device_info },
+	{ "ad4113",   (kernel_ulong_t)&ad4113_device_info },
 	{ "ad4114",   (kernel_ulong_t)&ad4114_device_info },
 	{ "ad4115",   (kernel_ulong_t)&ad4115_device_info },
 	{ "ad4116",   (kernel_ulong_t)&ad4116_device_info },

-- 
2.43.0