linux-kernel - [PATCH 6/6] iio: adc: ad4080: add support for AD4087

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Message-ID: <20251021105349.21145-7-antoniu.miclaus@analog.com>
Date: Tue, 21 Oct 2025 10:53:48 +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 6/6] iio: adc: ad4080: add support for AD4087

Add support for AD4087 14-bit SAR ADC. The AD4087 differs from
AD4080 in resolution (14-bit vs 20-bit) and LVDS CNV clock count
maximum (1 vs 7).

Changes:
- Add AD4087_CHIP_ID definition (0x0057)
- Create ad4087_channel with 14-bit resolution and 16-bit storage
- Add ad4087_chip_info with lvds_cnv_clk_cnt_max = 1
- Register AD4087 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 d6d0688adc3d..7cf3b6ed7940 100644
--- a/drivers/iio/adc/ad4080.c
+++ b/drivers/iio/adc/ad4080.c
@@ -130,6 +130,7 @@
 #define AD4083_CHIP_ID						0x0053
 #define AD4084_CHIP_ID						0x0054
 #define AD4086_CHIP_ID						0x0056
+#define AD4087_CHIP_ID						0x0057
 
 #define AD4080_LVDS_CNV_CLK_CNT_MAX				7
 
@@ -447,6 +448,8 @@ static const struct iio_chan_spec ad4084_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);
+
 static const struct ad4080_chip_info ad4080_chip_info = {
 	.name = "ad4080",
 	.product_id = AD4080_CHIP_ID,
@@ -497,6 +500,16 @@ static const struct ad4080_chip_info ad4086_chip_info = {
 	.lvds_cnv_clk_cnt_max = 4,
 };
 
+static const struct ad4080_chip_info ad4087_chip_info = {
+	.name = "ad4087",
+	.product_id = AD4087_CHIP_ID,
+	.scale_table = ad4080_scale_table,
+	.num_scales = ARRAY_SIZE(ad4080_scale_table),
+	.num_channels = 1,
+	.channels = &ad4087_channel,
+	.lvds_cnv_clk_cnt_max = 1,
+};
+
 static int ad4080_setup(struct iio_dev *indio_dev)
 {
 	struct ad4080_state *st = iio_priv(indio_dev);
@@ -656,6 +669,7 @@ static const struct spi_device_id ad4080_id[] = {
 	{ "ad4083", (kernel_ulong_t)&ad4083_chip_info },
 	{ "ad4084", (kernel_ulong_t)&ad4084_chip_info },
 	{ "ad4086", (kernel_ulong_t)&ad4086_chip_info },
+	{ "ad4087", (kernel_ulong_t)&ad4087_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(spi, ad4080_id);
@@ -666,6 +680,7 @@ static const struct of_device_id ad4080_of_match[] = {
 	{ .compatible = "adi,ad4083", &ad4083_chip_info },
 	{ .compatible = "adi,ad4084", &ad4084_chip_info },
 	{ .compatible = "adi,ad4086", &ad4086_chip_info },
+	{ .compatible = "adi,ad4087", &ad4087_chip_info },
 	{ }
 };
 MODULE_DEVICE_TABLE(of, ad4080_of_match);
-- 
2.43.0