linux-kernel - [PATCH 5/5] iio: adc: ad4080: add support for AD4081

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Message-ID: <20250929145909.111243-5-antoniu.miclaus@analog.com>
Date: Mon, 29 Sep 2025 14:59:09 +0000
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: <jic23@...nel.org>, <robh@...nel.org>, <conor+dt@...nel.org>,
        <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <devicetree@...r.kernel.org>
CC: Antoniu Miclaus <antoniu.miclaus@...log.com>
Subject: [PATCH 5/5] iio: adc: ad4080: add support for AD4081

Add support for AD4081 20-bit SAR ADC. The AD4081 has the same
resolution as AD4080 (20-bit) but differs in LVDS CNV clock count
maximum (2 vs 7).

Changes:
- Add AD4081_CHIP_ID definition (0x51)
- Create ad4081_channel with 20-bit resolution and 32-bit storage
- Add ad4081_chip_info with lvds_cnv_clk_cnt_max = 2
- Register AD4081 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 cf3460a1eee4..dab8933f573d 100644
--- a/drivers/iio/adc/ad4080.c
+++ b/drivers/iio/adc/ad4080.c
@@ -126,6 +126,7 @@
 /* Miscellaneous Definitions */
 #define AD4080_SPI_READ						BIT(7)
 #define AD4080_CHIP_ID						0x50
+#define AD4081_CHIP_ID						0x51
 #define AD4084_CHIP_ID						0x54
 
 #define AD4080_LVDS_CNV_CLK_CNT_MAX				7
@@ -436,6 +437,8 @@ static struct iio_chan_spec_ext_info ad4080_ext_info[] = {
 
 static const struct iio_chan_spec ad4080_channel = AD4080_CHANNEL_DEFINE(20, 32);
 
+static const struct iio_chan_spec ad4081_channel = AD4080_CHANNEL_DEFINE(20, 32);
+
 static const struct iio_chan_spec ad4084_channel = AD4080_CHANNEL_DEFINE(16, 16);
 
 static const struct ad4080_chip_info ad4080_chip_info = {
@@ -448,6 +451,16 @@ static const struct ad4080_chip_info ad4080_chip_info = {
 	.lvds_cnv_clk_cnt_max = AD4080_LVDS_CNV_CLK_CNT_MAX,
 };
 
+static const struct ad4080_chip_info ad4081_chip_info = {
+	.name = "ad4081",
+	.product_id = AD4081_CHIP_ID,
+	.scale_table = ad4080_scale_table,
+	.num_scales = ARRAY_SIZE(ad4080_scale_table),
+	.num_channels = 1,
+	.channels = &ad4081_channel,
+	.lvds_cnv_clk_cnt_max = 2,
+};
+
 static const struct ad4080_chip_info ad4084_chip_info = {
 	.name = "ad4084",
 	.product_id = AD4084_CHIP_ID,
@@ -610,6 +623,7 @@ static int ad4080_probe(struct spi_device *spi)
 
 static const struct spi_device_id ad4080_id[] = {
 	{ "ad4080", (kernel_ulong_t)&ad4080_chip_info },
+	{ "ad4081", (kernel_ulong_t)&ad4081_chip_info },
 	{ "ad4084", (kernel_ulong_t)&ad4084_chip_info },
 	{ }
 };
@@ -617,6 +631,7 @@ MODULE_DEVICE_TABLE(spi, ad4080_id);
 
 static const struct of_device_id ad4080_of_match[] = {
 	{ .compatible = "adi,ad4080", &ad4080_chip_info },
+	{ .compatible = "adi,ad4081", &ad4081_chip_info },
 	{ .compatible = "adi,ad4084", &ad4084_chip_info },
 	{ }
 };
-- 
2.43.0