[PATCH v4 11/11] iio: amplifiers: ad8366: update device support

Rodrigo Alencar via B4 Relay
2026-02-10T19:42:18Z

From: Rodrigo Alencar <rodrigo.alencar@analog.com>

Add support for the following digital step attenuators:
- HMC271A: 1dB LSB 5-Bit Digital Attenuator SMT, 0.7 - 3.7 GHz
- ADRF5720: 0.5 dB LSB, 6-Bit, Digital Attenuator, 9 kHz to 40 GHz
- ADRF5730: 0.5 dB LSB, 6-Bit, Digital Attenuator, 100 MHz to 40 GHz
- ADRF5731: 2 dB LSB, 4-Bit, Digital Attenuator, 100 MHz to 40 GHz
- HMC1018A: 1.0 dB LSB GaAs MMIC 5-BIT DIGITAL ATTENUATOR, 0.1 - 30 GHz
- HMC1019A: 0.5 dB LSB GaAs MMIC 5-BIT DIGITAL ATTENUATOR, 0.1 - 30 GHz

Additionally, copyright notice was updated with current year.

Co-developed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Co-developed-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
---
drivers/iio/amplifiers/Kconfig | 6 ++++
drivers/iio/amplifiers/ad8366.c | 69 ++++++++++++++++++++++++++++++++++++++++-
2 files changed, 74 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/amplifiers/Kconfig b/drivers/iio/amplifiers/Kconfig
index a8a604863eed..39d280d4d437 100644
--- a/drivers/iio/amplifiers/Kconfig
+++ b/drivers/iio/amplifiers/Kconfig
@@ -18,7 +18,13 @@ config AD8366
AD8366 Dual-Digital Variable Gain Amplifier (VGA)
ADA4961 BiCMOS RF Digital Gain Amplifier (DGA)
ADL5240 Digitally controlled variable gain amplifier (VGA)
+ ADRF5720: 0.5 dB LSB, 6-Bit, Silicon Digital Attenuator
+ ADRF5730: 0.5 dB LSB, 6-Bit, Silicon Digital Attenuator
+ ADRF5731: 2 dB LSB, 4-Bit, Silicon Digital Attenuator
+ HMC271A: 1dB LSB 5-Bit Digital Attenuator SMT
HMC792A 0.25 dB LSB GaAs MMIC 6-Bit Digital Attenuator
+ HMC1018A: 1.0 dB LSB GaAs MMIC 5-BIT Digital Attenuator
+ HMC1019A: 0.5 dB LSB GaAs MMIC 5-BIT Digital Attenuator
HMC1119 0.25 dB LSB, 7-Bit, Silicon Digital Attenuator

To compile this driver as a module, choose M here: the
diff --git a/drivers/iio/amplifiers/ad8366.c b/drivers/iio/amplifiers/ad8366.c
index b828b4be7b6e..557243497339 100644
--- a/drivers/iio/amplifiers/ad8366.c
+++ b/drivers/iio/amplifiers/ad8366.c
@@ -5,10 +5,16 @@
* AD8366 Dual-Digital Variable Gain Amplifier (VGA)
* ADA4961 BiCMOS RF Digital Gain Amplifier (DGA)
* ADL5240 Digitally controlled variable gain amplifier (VGA)
+ * ADRF5720: 0.5 dB LSB, 6-Bit, Silicon Digital Attenuator, 9 kHz to 40 GHz
+ * ADRF5730: 0.5 dB LSB, 6-Bit, Silicon Digital Attenuator, 100 MHz to 40 GHz
+ * ADRF5731: 2 dB LSB, 4-Bit, Silicon Digital Attenuator, 100 MHz to 40 GHz
+ * HMC271A: 1dB LSB 5-Bit Digital Attenuator SMT, 0.7 - 3.7 GHz
* HMC792A 0.25 dB LSB GaAs MMIC 6-Bit Digital Attenuator
+ * HMC1018A: 1.0 dB LSB GaAs MMIC 5-BIT DIGITAL ATTENUATOR, 0.1 - 30 GHz
+ * HMC1019A: 0.5 dB LSB GaAs MMIC 5-BIT DIGITAL ATTENUATOR, 0.1 - 30 GHz
* HMC1119 0.25 dB LSB, 7-Bit, Silicon Digital Attenuator
*
- * Copyright 2012-2019 Analog Devices Inc.
+ * Copyright 2012-2026 Analog Devices Inc.
*/

#include <linux/bitrev.h>
@@ -55,6 +61,18 @@ static size_t ad8366_pack_code(struct ad8366_state *st)
return sizeof(__be16);
}

+static size_t adrf5731_pack_code(struct ad8366_state *st)
+{
+ st->data[0] = st->ch[0] << 2;
+ return 1;
+}
+
+static size_t hmc271_pack_code(struct ad8366_state *st)
+{
+ st->data[0] = bitrev8(st->ch[0]) >> 3;
+ return 1;
+}
+
static const struct ad8366_info ad8366_chip_info = {
.gain_min = 4500,
.gain_max = 20500,
@@ -77,6 +95,29 @@ static const struct ad8366_info adl5240_chip_info = {
.num_channels = 1,
};

+static const struct ad8366_info adrf57x0_chip_info = {
+ .gain_min = -31500,
+ .gain_max = 0,
+ .gain_step = -500,
+ .num_channels = 1,
+};
+
+static const struct ad8366_info adrf5731_chip_info = {
+ .gain_min = -30000,
+ .gain_max = 0,
+ .gain_step = -2000,
+ .num_channels = 1,
+ .pack_code = adrf5731_pack_code,
+};
+
+static const struct ad8366_info hmc271_chip_info = {
+ .gain_min = -31000,
+ .gain_max = 0,
+ .gain_step = 1000,
+ .num_channels = 1,
+ .pack_code = hmc271_pack_code,
+};
+
static const struct ad8366_info hmc792_chip_info = {
.gain_min = -15750,
.gain_max = 0,
@@ -84,6 +125,20 @@ static const struct ad8366_info hmc792_chip_info = {
.num_channels = 1,
};

+static const struct ad8366_info hmc1018_chip_info = {
+ .gain_min = -31000,
+ .gain_max = 0,
+ .gain_step = 1000,
+ .num_channels = 1,
+};
+
+static const struct ad8366_info hmc1019_chip_info = {
+ .gain_min = -15500,
+ .gain_max = 0,
+ .gain_step = 500,
+ .num_channels = 1,
+};
+
static const struct ad8366_info hmc1119_chip_info = {
.gain_min = -31750,
.gain_max = 0,
@@ -254,7 +309,13 @@ static const struct spi_device_id ad8366_id[] = {
{"ad8366", (kernel_ulong_t)&ad8366_chip_info},
{"ada4961", (kernel_ulong_t)&ada4961_chip_info},
{"adl5240", (kernel_ulong_t)&adl5240_chip_info},
+ {"adrf5720", (kernel_ulong_t)&adrf57x0_chip_info},
+ {"adrf5730", (kernel_ulong_t)&adrf57x0_chip_info},
+ {"adrf5731", (kernel_ulong_t)&adrf5731_chip_info},
+ {"hmc271a", (kernel_ulong_t)&hmc271_chip_info},
{"hmc792a", (kernel_ulong_t)&hmc792_chip_info},
+ {"hmc1018a", (kernel_ulong_t)&hmc1018_chip_info},
+ {"hmc1019a", (kernel_ulong_t)&hmc1019_chip_info},
{"hmc1119", (kernel_ulong_t)&hmc1119_chip_info},
{ }
};
@@ -264,7 +325,13 @@ static const struct of_device_id ad8366_of_match[] = {
{ .compatible = "adi,ad8366", .data = &ad8366_chip_info },
{ .compatible = "adi,ada4961", .data = &ada4961_chip_info },
{ .compatible = "adi,adl5240", .data = &adl5240_chip_info },
+ { .compatible = "adi,adrf5720", .data = &adrf57x0_chip_info },
+ { .compatible = "adi,adrf5730", .data = &adrf57x0_chip_info },
+ { .compatible = "adi,adrf5731", .data = &adrf5731_chip_info },
+ { .compatible = "adi,hmc271a", .data = &hmc271_chip_info },
{ .compatible = "adi,hmc792a", .data = &hmc792_chip_info },
+ { .compatible = "adi,hmc1018a", .data = &hmc1018_chip_info },
+ { .compatible = "adi,hmc1019a", .data = &hmc1019_chip_info },
{ .compatible = "adi,hmc1119", .data = &hmc1119_chip_info },
{ }
};

--
2.43.0