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

[Dumitru Ceclan <mitrutzceclan@gmail.com>]

Add support for Analog Devices AD7172-2, AD7175-8, AD7177-2.

Signed-off-by: Dumitru Ceclan <mitrutzceclan@gmail.com>
---
 drivers/iio/adc/ad7173.c | 82 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 74 insertions(+), 8 deletions(-)

diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
index b42fbe28a325..e60ecce20e08 100644
--- a/drivers/iio/adc/ad7173.c
+++ b/drivers/iio/adc/ad7173.c
@@ -1,6 +1,11 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * AD7172-2/AD7173-8/AD7175-2/AD7176-2 SPI ADC driver
+ * AD717x family SPI ADC driver
+ *
+ * Supported devices:
+ *  AD7172-2/AD7172-4/AD7173-8/AD7175-2
+ *  AD7175-8/AD7176-2/AD7177-2
+ *
  * Copyright (C) 2015, 2024 Analog Devices, Inc.
  */
 
@@ -61,10 +66,13 @@
 #define AD7173_AIN_TEMP_POS	17
 #define AD7173_AIN_TEMP_NEG	18
 
-#define AD7172_ID			0x00d0
-#define AD7173_ID			0x30d0
-#define AD7175_ID			0x0cd0
+#define AD7172_2_ID			0x00d0
 #define AD7176_ID			0x0c90
+#define AD7175_2_ID			0x0cd0
+#define AD7172_4_ID			0x2050
+#define AD7173_ID			0x30d0
+#define AD7175_8_ID			0x3cd0
+#define AD7177_ID			0x4fd0
 #define AD7173_ID_MASK			GENMASK(15, 4)
 
 #define AD7173_ADC_MODE_REF_EN		BIT(15)
@@ -110,15 +118,19 @@
 #define AD7173_SETUP_REF_SEL_EXT_REF	0x0
 #define AD7173_VOLTAGE_INT_REF_uV	2500000
 #define AD7173_TEMP_SENSIIVITY_uV_per_C	477
+#define AD7177_ODR_START_VALUE		0x07
 
 #define AD7173_FILTER_ODR0_MASK		GENMASK(5, 0)
 #define AD7173_MAX_CONFIGS		8
 
 enum ad7173_ids {
 	ID_AD7172_2,
+	ID_AD7172_4,
 	ID_AD7173_8,
 	ID_AD7175_2,
+	ID_AD7175_8,
 	ID_AD7176_2,
+	ID_AD7177_2,
 };
 
 struct ad7173_device_info {
@@ -190,7 +202,7 @@ static const unsigned int ad7175_sinc5_data_rates[] = {
 static const struct ad7173_device_info ad7173_device_info[] = {
 	[ID_AD7172_2] = {
 		.name = "ad7172-2",
-		.id = AD7172_ID,
+		.id = AD7172_2_ID,
 		.num_inputs = 5,
 		.num_channels = 4,
 		.num_configs = 4,
@@ -200,6 +212,17 @@ static const struct ad7173_device_info ad7173_device_info[] = {
 		.sinc5_data_rates = ad7173_sinc5_data_rates,
 		.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
 	},
+	[ID_AD7172_4] = {
+		.id = AD7172_4_ID,
+		.num_inputs = 9,
+		.num_channels = 8,
+		.num_configs = 8,
+		.num_gpios = 4,
+		.has_temp = false,
+		.clock = 2 * HZ_PER_MHZ,
+		.sinc5_data_rates = ad7173_sinc5_data_rates,
+		.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
+	},
 	[ID_AD7173_8] = {
 		.name = "ad7173-8",
 		.id = AD7173_ID,
@@ -214,7 +237,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
 	},
 	[ID_AD7175_2] = {
 		.name = "ad7175-2",
-		.id = AD7175_ID,
+		.id = AD7175_2_ID,
 		.num_inputs = 5,
 		.num_channels = 4,
 		.num_configs = 4,
@@ -224,6 +247,17 @@ static const struct ad7173_device_info ad7173_device_info[] = {
 		.sinc5_data_rates = ad7175_sinc5_data_rates,
 		.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
 	},
+	[ID_AD7175_8] = {
+		.id = AD7175_8_ID,
+		.num_inputs = 17,
+		.num_channels = 16,
+		.num_configs = 8,
+		.num_gpios = 4,
+		.has_temp = true,
+		.clock = 16 * HZ_PER_MHZ,
+		.sinc5_data_rates = ad7175_sinc5_data_rates,
+		.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
+	},
 	[ID_AD7176_2] = {
 		.name = "ad7176-2",
 		.id = AD7176_ID,
@@ -236,6 +270,17 @@ static const struct ad7173_device_info ad7173_device_info[] = {
 		.sinc5_data_rates = ad7175_sinc5_data_rates,
 		.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
 	},
+	[ID_AD7177_2] = {
+		.id = AD7177_ID,
+		.num_inputs = 5,
+		.num_channels = 4,
+		.num_configs = 4,
+		.num_gpios = 2,
+		.has_temp = true,
+		.clock = 16 * HZ_PER_MHZ,
+		.sinc5_data_rates = ad7175_sinc5_data_rates,
+		.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
+	},
 };
 
 static const char *const ad7173_ref_sel_str[] = {
@@ -656,7 +701,12 @@ static int ad7173_write_raw(struct iio_dev *indio_dev,
 	switch (info) {
 	case IIO_CHAN_INFO_SAMP_FREQ:
 		freq = val * MILLI + val2 / MILLI;
-		for (i = 0; i < st->info->num_sinc5_data_rates - 1; i++)
+		/*
+		 * AD7177-2 has the filter values [0-6] marked as reserved
+		 * datasheet page 58
+		 */
+		i = (st->info->id == AD7177_ID) ? AD7177_ODR_START_VALUE : 0;
+		for (; i < st->info->num_sinc5_data_rates - 1; i++)
 			if (freq >= st->info->sinc5_data_rates[i])
 				break;
 
@@ -908,8 +958,15 @@ static int ad7173_fw_parse_channel_config(struct iio_dev *indio_dev)
 		else
 			ref_sel = ret;
 
+		if (ref_sel == AD7173_SETUP_REF_SEL_INT_REF &&
+		    st->info->id == AD7172_2_ID) {
+			fwnode_handle_put(child);
+			return dev_err_probe(dev, -EINVAL,
+				"Internal reference is not available on ad7172-2\n");
+		}
+
 		if (ref_sel == AD7173_SETUP_REF_SEL_EXT_REF2 &&
-		    st->info->id != AD7173_ID) {
+		    st->info->id != AD7173_ID && st->info->id != AD7172_2_ID) {
 			fwnode_handle_put(child);
 			return dev_err_probe(dev, -EINVAL,
 				"External reference 2 is only available on ad7173-8\n");
@@ -1080,21 +1137,30 @@ static int ad7173_probe(struct spi_device *spi)
 static const struct of_device_id ad7173_of_match[] = {
 	{ .compatible = "adi,ad7172-2",
 	  .data = &ad7173_device_info[ID_AD7172_2]},
+	{ .compatible = "adi,ad7172-4",
+	  .data = &ad7173_device_info[ID_AD7172_4]},
 	{ .compatible = "adi,ad7173-8",
 	  .data = &ad7173_device_info[ID_AD7173_8]},
 	{ .compatible = "adi,ad7175-2",
 	  .data = &ad7173_device_info[ID_AD7175_2]},
+	{ .compatible = "adi,ad7175-8",
+	  .data = &ad7173_device_info[ID_AD7175_8]},
 	{ .compatible = "adi,ad7176-2",
 	  .data = &ad7173_device_info[ID_AD7176_2]},
+	{ .compatible = "adi,ad7177-2",
+	  .data = &ad7173_device_info[ID_AD7177_2]},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ad7173_of_match);
 
 static const struct spi_device_id ad7173_id_table[] = {
 	{ "ad7172-2", (kernel_ulong_t)&ad7173_device_info[ID_AD7172_2]},
+	{ "ad7172-4", (kernel_ulong_t)&ad7173_device_info[ID_AD7172_4] },
 	{ "ad7173-8", (kernel_ulong_t)&ad7173_device_info[ID_AD7173_8]},
 	{ "ad7175-2", (kernel_ulong_t)&ad7173_device_info[ID_AD7175_2]},
+	{ "ad7175-8", (kernel_ulong_t)&ad7173_device_info[ID_AD7175_8]},
 	{ "ad7176-2", (kernel_ulong_t)&ad7173_device_info[ID_AD7176_2]},
+	{ "ad7177-2", (kernel_ulong_t)&ad7173_device_info[ID_AD7177_2]},
 	{ }
 };
 MODULE_DEVICE_TABLE(spi, ad7173_id_table);
-- 
2.43.0