linux-kernel - [PATCH 4/6] iio: adc: ad4080: add support for AD4085

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Message-ID: <587dbc9c21b49c7d99b6b5b8dad419fad415e040.1770382796.git.antoniu.miclaus@analog.com>
Date: Fri, 6 Feb 2026 15:08:23 +0200
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich
	<Michael.Hennerich@...log.com>,
        Antoniu Miclaus <antoniu.miclaus@...log.com>,
        Jonathan Cameron <jic23@...nel.org>,
        David Lechner <dlechner@...libre.com>,
        Nuno Sá <nuno.sa@...log.com>,
        Andy Shevchenko
	<andy@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, <linux-iio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/6] iio: adc: ad4080: add support for AD4085

Add support for AD4085 16-bit SAR ADC. The AD4085 has the same
resolution as AD4084 (16-bit) but differs in LVDS CNV clock count
maximum (8 vs 2).

Changes:
- Add AD4085_CHIP_ID definition (0x0055)
- Create ad4085_channel with 16-bit resolution and 16-bit storage
- Add ad4085_chip_info with lvds_cnv_clk_cnt_max = 8
- Register AD4085 in device ID and OF match tables

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
 drivers/iio/adc/ad4080.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/iio/adc/ad4080.c b/drivers/iio/adc/ad4080.c
index 7cbbe284dea7..728df626f09e 100644
--- a/drivers/iio/adc/ad4080.c
+++ b/drivers/iio/adc/ad4080.c
@@ -130,6 +130,7 @@
 #define AD4082_CHIP_ID						0x0052
 #define AD4083_CHIP_ID						0x0053
 #define AD4084_CHIP_ID						0x0054
+#define AD4085_CHIP_ID						0x0055
 #define AD4086_CHIP_ID						0x0056
 #define AD4087_CHIP_ID						0x0057
 
@@ -449,6 +450,8 @@ static const struct iio_chan_spec ad4083_channel = AD4080_CHANNEL_DEFINE(16, 16)
 
 static const struct iio_chan_spec ad4084_channel = AD4080_CHANNEL_DEFINE(16, 16);
 
+static const struct iio_chan_spec ad4085_channel = AD4080_CHANNEL_DEFINE(16, 16);
+
 static const struct iio_chan_spec ad4086_channel = AD4080_CHANNEL_DEFINE(14, 16);
 
 static const struct iio_chan_spec ad4087_channel = AD4080_CHANNEL_DEFINE(14, 16);
@@ -503,6 +506,16 @@ static const struct ad4080_chip_info ad4084_chip_info = {
 	.lvds_cnv_clk_cnt_max = 2,
 };
 
+static const struct ad4080_chip_info ad4085_chip_info = {
+	.name = "ad4085",
+	.product_id = AD4085_CHIP_ID,
+	.scale_table = ad4080_scale_table,
+	.num_scales = ARRAY_SIZE(ad4080_scale_table),
+	.num_channels = 1,
+	.channels = &ad4085_channel,
+	.lvds_cnv_clk_cnt_max = 8,
+};
+
 static const struct ad4080_chip_info ad4086_chip_info = {
 	.name = "ad4086",
 	.product_id = AD4086_CHIP_ID,
@@ -682,6 +695,7 @@ static const struct spi_device_id ad4080_id[] = {
 	{ "ad4082", (kernel_ulong_t)&ad4082_chip_info },
 	{ "ad4083", (kernel_ulong_t)&ad4083_chip_info },
 	{ "ad4084", (kernel_ulong_t)&ad4084_chip_info },
+	{ "ad4085", (kernel_ulong_t)&ad4085_chip_info },
 	{ "ad4086", (kernel_ulong_t)&ad4086_chip_info },
 	{ "ad4087", (kernel_ulong_t)&ad4087_chip_info },
 	{ }
@@ -694,6 +708,7 @@ static const struct of_device_id ad4080_of_match[] = {
 	{ .compatible = "adi,ad4082", &ad4082_chip_info },
 	{ .compatible = "adi,ad4083", &ad4083_chip_info },
 	{ .compatible = "adi,ad4084", &ad4084_chip_info },
+	{ .compatible = "adi,ad4085", &ad4085_chip_info },
 	{ .compatible = "adi,ad4086", &ad4086_chip_info },
 	{ .compatible = "adi,ad4087", &ad4087_chip_info },
 	{ }
-- 
2.43.0