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Fri, 21 Nov 2025 04:52:14 -0500 From: Antoniu Miclaus To: , , , , , CC: Antoniu Miclaus Subject: [PATCH v4 1/2] dt-bindings: iio: amplifiers: add adl8113 Date: Fri, 21 Nov 2025 09:52:02 +0000 Message-ID: <20251121095204.18574-2-antoniu.miclaus@analog.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251121095204.18574-1-antoniu.miclaus@analog.com> References: <20251121095204.18574-1-antoniu.miclaus@analog.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTIxMDA3NCBTYWx0ZWRfX6R7P0bRM0bla r02hSXbBwpnrt4PNZHf4mvpr1I5O22P4TqtUzg8DFFY7EV4tejVYDWMDJMyRmviISDFe4+cuexu j7iU16yEuhOnTVqSFcghKybIbMpjOWAKSj8CjszzI0OmG6WO9L8Sp3xFFvpPKKfYm8dhyYfcJaL sz9jD058Rth/Iq24JxhENVCgC+Wb1Hg9ZcJeu05taB3ESGaWPHexk04XgMEVvkKp0rcrdW9RSaz iLMjRNDvJEyPckUQz07XzQ5VMVWhwWM9DXKYIn+nmUxW3E+ZQdRk7phxuV3pYF7YIVdzpL9wKCY u8bPJ0B9EWGRPahFPWwcMYRswBGEeo2e0xYkXbV8PYFq/h+XLwFbEQVredJGNnMmTPfmUuKlcEu PhFT7f+QtHpCmU+jx99cQOClq2Uo5A== X-Authority-Analysis: v=2.4 cv=DvhbOW/+ c=1 sm=1 tr=0 ts=69203653 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=6UeiqGixMTsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=gEfo2CItAAAA:8 a=gAnH3GRIAAAA:8 a=1yNy12B5puk2P9Y3jxYA:9 a=4Crt4hL0rqkA:10 a=shvgCOL7IKUA:10 a=sptkURWiP4Gy88Gu7hUp:22 X-Proofpoint-GUID: kFp1Zww_BKz6tOULahRS2b2uI2SsQsjR X-Proofpoint-ORIG-GUID: kFp1Zww_BKz6tOULahRS2b2uI2SsQsjR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-21_03,2025-11-20_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 spamscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 bulkscore=0 adultscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511210074 Content-Type: text/plain; charset="utf-8" Add devicetree bindings for adl8113. Signed-off-by: Antoniu Miclaus --- Changes in v4: - Add adi,external-bypass-a-gain-db and adi,external-bypass-b-gain-db prope= rties - Add example with external amplifier configuration --- .../bindings/iio/amplifiers/adi,adl8113.yaml | 93 +++++++++++++++++++ 1 file changed, 93 insertions(+) create mode 100644 Documentation/devicetree/bindings/iio/amplifiers/adi,ad= l8113.yaml diff --git a/Documentation/devicetree/bindings/iio/amplifiers/adi,adl8113.y= aml b/Documentation/devicetree/bindings/iio/amplifiers/adi,adl8113.yaml new file mode 100644 index 000000000000..3da5de01e31b --- /dev/null +++ b/Documentation/devicetree/bindings/iio/amplifiers/adi,adl8113.yaml @@ -0,0 +1,93 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iio/amplifiers/adi,adl8113.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices ADL8113 Low Noise Amplifier with integrated bypass s= witches + +maintainers: + - Antoniu Miclaus + +description: | + The ADL8113 is a 10MHz to 12GHz Low Noise Amplifier with integrated bypa= ss + switches controlled by two GPIO pins (VA and VB). The device supports fo= ur + operation modes: + - Internal Amplifier: VA=3D0, VB=3D0 - Signal passes through the inter= nal LNA + - Internal Bypass: VA=3D1, VB=3D1 - Signal bypasses through internal p= ath + - External Bypass A: VA=3D0, VB=3D1 - Signal routes from RFIN to OUT_A= and from IN_A to RFOUT + - External Bypass B: VA=3D1, VB=3D0 - Signal routes from RFIN to OUT_B= and from IN_B to RFOUT + + https://www.analog.com/en/products/adl8113.html + +properties: + compatible: + const: adi,adl8113 + + vdd1-supply: true + + vdd2-supply: true + + vss2-supply: true + + va-gpios: + description: + GPIO connected to the VA control pin. Must be specified as GPIO_ACTI= VE_HIGH. + maxItems: 1 + + vb-gpios: + description: + GPIO connected to the VB control pin. Must be specified as GPIO_ACTI= VE_HIGH. + maxItems: 1 + + adi,external-bypass-a-gain-db: + description: + Gain in dB of external amplifier connected to bypass path A (OUT_A/I= N_A). + When specified, this gain value becomes selectable via the hardwareg= ain + attribute and automatically routes through the external A path. + + adi,external-bypass-b-gain-db: + description: + Gain in dB of external amplifier connected to bypass path B (OUT_B/I= N_B). + When specified, this gain value becomes selectable via the hardwareg= ain + attribute and automatically routes through the external B path. + +required: + - compatible + - va-gpios + - vb-gpios + - vdd1-supply + - vdd2-supply + - vss2-supply + +additionalProperties: false + +examples: + - | + #include + + /* Basic configuration with only internal paths */ + amplifier { + compatible =3D "adi,adl8113"; + va-gpios =3D <&gpio 22 GPIO_ACTIVE_HIGH>; + vb-gpios =3D <&gpio 23 GPIO_ACTIVE_HIGH>; + vdd1-supply =3D <&vdd1_5v>; + vdd2-supply =3D <&vdd2_3v3>; + vss2-supply =3D <&vss2_neg>; + }; + + - | + #include + + /* Configuration with external bypass amplifiers */ + amplifier { + compatible =3D "adi,adl8113"; + va-gpios =3D <&gpio 24 GPIO_ACTIVE_HIGH>; + vb-gpios =3D <&gpio 25 GPIO_ACTIVE_HIGH>; + vdd1-supply =3D <&vdd1_5v>; + vdd2-supply =3D <&vdd2_3v3>; + vss2-supply =3D <&vss2_neg>; + adi,external-bypass-a-gain-db =3D <20>; + adi,external-bypass-b-gain-db =3D <6>; + }; +... --=20 2.43.0 From nobody Tue Dec 2 01:30:21 2025 Received: from mx0b-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 42FF834252C; Fri, 21 Nov 2025 09:52:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.135.77 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763718747; cv=none; b=jnmm0QHQdhBPiqJb0HEd/kx0dPOxsiCQXGO8P+KXn8O5j8JzitRpHwfzOBa+WAL5+MvNAozPSIdjj9hz6uyZgh/Ur1c6yUoRL4x1qdg2sUaJZga2NpvAbnI4XM8cGOwZA1q3mW0d2w+kZELUBUr7wPiSHOV9vX2zO2hLvXXjizM= ARC-Message-Signature: i=1; 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charset="utf-8" Add support for adl8113 10MHz to 12GHz Low Noise Amplifier with 10MHz to 14GHz bypass switches. Signed-off-by: Antoniu Miclaus --- Changes in v4: - Replace signal_path sysfs attribute with hardwaregain-only control - Add support for external bypass amplifiers via DT properties - Introduce dynamic gain configuration system with adl8113_gain_config stru= cture --- drivers/iio/amplifiers/Kconfig | 12 ++ drivers/iio/amplifiers/Makefile | 1 + drivers/iio/amplifiers/adl8113.c | 277 +++++++++++++++++++++++++++++++ 3 files changed, 290 insertions(+) create mode 100644 drivers/iio/amplifiers/adl8113.c diff --git a/drivers/iio/amplifiers/Kconfig b/drivers/iio/amplifiers/Kconfig index 55eb16b32f6c..a8a604863eed 100644 --- a/drivers/iio/amplifiers/Kconfig +++ b/drivers/iio/amplifiers/Kconfig @@ -36,6 +36,18 @@ config ADA4250 To compile this driver as a module, choose M here: the module will be called ada4250. =20 +config ADL8113 + tristate "Analog Devices ADL8113 Low Noise Amplifier" + depends on GPIOLIB + help + Say yes here to build support for Analog Devices ADL8113 Low Noise + Amplifier with integrated bypass switches. The device supports four + operation modes controlled by GPIO pins: internal amplifier, + internal bypass, and two external bypass modes. + + To compile this driver as a module, choose M here: the + module will be called adl8113. + config HMC425 tristate "Analog Devices HMC425A and similar GPIO Gain Amplifiers" depends on GPIOLIB diff --git a/drivers/iio/amplifiers/Makefile b/drivers/iio/amplifiers/Makef= ile index 2126331129cf..0a76443be1aa 100644 --- a/drivers/iio/amplifiers/Makefile +++ b/drivers/iio/amplifiers/Makefile @@ -6,4 +6,5 @@ # When adding new entries keep the list in alphabetical order obj-$(CONFIG_AD8366) +=3D ad8366.o obj-$(CONFIG_ADA4250) +=3D ada4250.o +obj-$(CONFIG_ADL8113) +=3D adl8113.o obj-$(CONFIG_HMC425) +=3D hmc425a.o diff --git a/drivers/iio/amplifiers/adl8113.c b/drivers/iio/amplifiers/adl8= 113.c new file mode 100644 index 000000000000..118789aa2c19 --- /dev/null +++ b/drivers/iio/amplifiers/adl8113.c @@ -0,0 +1,277 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ADL8113 Low Noise Amplifier with integrated bypass switches + * + * Copyright 2025 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +enum adl8113_signal_path { + ADL8113_INTERNAL_AMP, + ADL8113_INTERNAL_BYPASS, + ADL8113_EXTERNAL_A, + ADL8113_EXTERNAL_B, +}; + +struct adl8113_gain_config { + enum adl8113_signal_path path; + int gain_db; + int va; + int vb; +}; + +struct adl8113_state { + struct gpio_desc *gpio_va; + struct gpio_desc *gpio_vb; + struct adl8113_gain_config *gain_configs; + int num_gain_configs; + enum adl8113_signal_path current_path; +}; + +static const char * const adl8113_supply_names[] =3D { + "vdd1", + "vdd2", + "vss2" +}; + +static int adl8113_set_path(struct adl8113_state *st, + enum adl8113_signal_path path) +{ + int va, vb; + + /* Determine GPIO values based on signal path */ + switch (path) { + case ADL8113_INTERNAL_AMP: + va =3D 0; vb =3D 0; /* Internal amplifier */ + break; + case ADL8113_INTERNAL_BYPASS: + va =3D 1; vb =3D 1; /* Internal bypass */ + break; + case ADL8113_EXTERNAL_A: + va =3D 0; vb =3D 1; /* External bypass A */ + break; + case ADL8113_EXTERNAL_B: + va =3D 1; vb =3D 0; /* External bypass B */ + break; + default: + return -EINVAL; + } + + gpiod_set_value(st->gpio_va, va); + gpiod_set_value(st->gpio_vb, vb); + st->current_path =3D path; + return 0; +} + +static int adl8113_find_gain_config(struct adl8113_state *st, int gain_db) +{ + int i; + + for (i =3D 0; i < st->num_gain_configs; i++) { + if (st->gain_configs[i].gain_db =3D=3D gain_db) + return i; + } + return -EINVAL; +} + +static const struct iio_chan_spec adl8113_channels[] =3D { + { + .type =3D IIO_VOLTAGE, + .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_HARDWAREGAIN), + .indexed =3D 1, + .channel =3D 0, + }, +}; + +static int adl8113_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct adl8113_state *st =3D iio_priv(indio_dev); + int i; + + switch (mask) { + case IIO_CHAN_INFO_HARDWAREGAIN: + /* Find current gain configuration */ + for (i =3D 0; i < st->num_gain_configs; i++) { + if (st->gain_configs[i].path =3D=3D st->current_path) { + *val =3D st->gain_configs[i].gain_db; + *val2 =3D 0; + return IIO_VAL_INT_PLUS_MICRO_DB; + } + } + return -EINVAL; + default: + return -EINVAL; + } +} + +static int adl8113_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct adl8113_state *st =3D iio_priv(indio_dev); + int config_idx; + + switch (mask) { + case IIO_CHAN_INFO_HARDWAREGAIN: + if (val2 !=3D 0) + return -EINVAL; + + config_idx =3D adl8113_find_gain_config(st, val); + if (config_idx < 0) + return -EINVAL; + + return adl8113_set_path(st, st->gain_configs[config_idx].path); + default: + return -EINVAL; + } +} + +static const struct iio_info adl8113_info =3D { + .read_raw =3D adl8113_read_raw, + .write_raw =3D adl8113_write_raw, +}; + +static int adl8113_init_gain_configs(struct device *dev, struct adl8113_st= ate *st) +{ + int external_a_gain, external_b_gain; + int num_configs =3D 2; /* Always have internal amp and internal bypass */ + int i =3D 0; + + /* Check for optional external bypass amplifier gains */ + if (!device_property_read_u32(dev, "adi,external-bypass-a-gain-db", + &external_a_gain)) + num_configs++; + + if (!device_property_read_u32(dev, "adi,external-bypass-b-gain-db", + &external_b_gain)) + num_configs++; + + st->gain_configs =3D devm_kcalloc(dev, num_configs, + sizeof(*st->gain_configs), GFP_KERNEL); + if (!st->gain_configs) + return -ENOMEM; + + /* Always include internal amplifier (14dB) */ + st->gain_configs[i].path =3D ADL8113_INTERNAL_AMP; + st->gain_configs[i].gain_db =3D 14; + i++; + + /* Always include internal bypass (0dB) */ + st->gain_configs[i].path =3D ADL8113_INTERNAL_BYPASS; + st->gain_configs[i].gain_db =3D 0; + i++; + + /* Add external bypass A if configured */ + if (!device_property_read_u32(dev, "adi,external-bypass-a-gain-db", + &external_a_gain)) { + st->gain_configs[i].path =3D ADL8113_EXTERNAL_A; + st->gain_configs[i].gain_db =3D external_a_gain; + i++; + } + + /* Add external bypass B if configured */ + if (!device_property_read_u32(dev, "adi,external-bypass-b-gain-db", + &external_b_gain)) { + st->gain_configs[i].path =3D ADL8113_EXTERNAL_B; + st->gain_configs[i].gain_db =3D external_b_gain; + i++; + } + + st->num_gain_configs =3D num_configs; + + /* Check for duplicate gain values */ + for (i =3D 0; i < num_configs - 1; i++) { + for (int j =3D i + 1; j < num_configs; j++) { + if (st->gain_configs[i].gain_db =3D=3D st->gain_configs[j].gain_db) { + dev_err(dev, "Duplicate gain values not allowed: %d dB\n", + st->gain_configs[i].gain_db); + return -EINVAL; + } + } + } + + return 0; +} + +static int adl8113_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct adl8113_state *st; + struct iio_dev *indio_dev; + int ret; + + indio_dev =3D devm_iio_device_alloc(dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + st =3D iio_priv(indio_dev); + + st->gpio_va =3D devm_gpiod_get(dev, "va", GPIOD_OUT_LOW); + if (IS_ERR(st->gpio_va)) + return dev_err_probe(dev, PTR_ERR(st->gpio_va), + "failed to get VA GPIO\n"); + + st->gpio_vb =3D devm_gpiod_get(dev, "vb", GPIOD_OUT_LOW); + if (IS_ERR(st->gpio_vb)) + return dev_err_probe(dev, PTR_ERR(st->gpio_vb), + "failed to get VB GPIO\n"); + + ret =3D devm_regulator_bulk_get_enable(dev, + ARRAY_SIZE(adl8113_supply_names), + adl8113_supply_names); + if (ret) + return dev_err_probe(dev, ret, + "failed to get and enable supplies\n"); + + /* Initialize gain configurations from devicetree */ + ret =3D adl8113_init_gain_configs(dev, st); + if (ret) + return ret; + + /* Initialize to internal amplifier path (14dB) */ + ret =3D adl8113_set_path(st, ADL8113_INTERNAL_AMP); + if (ret) + return ret; + + indio_dev->info =3D &adl8113_info; + indio_dev->name =3D "adl8113"; + indio_dev->channels =3D adl8113_channels; + indio_dev->num_channels =3D ARRAY_SIZE(adl8113_channels); + indio_dev->modes =3D INDIO_DIRECT_MODE; + + return devm_iio_device_register(dev, indio_dev); +} + +static const struct of_device_id adl8113_of_match[] =3D { + { .compatible =3D "adi,adl8113" }, + { } +}; +MODULE_DEVICE_TABLE(of, adl8113_of_match); + +static struct platform_driver adl8113_driver =3D { + .driver =3D { + .name =3D "adl8113", + .of_match_table =3D adl8113_of_match, + }, + .probe =3D adl8113_probe, +}; + +module_platform_driver(adl8113_driver); + +MODULE_AUTHOR("Antoniu Miclaus "); +MODULE_DESCRIPTION("Analog Devices ADL8113 Low Noise Amplifier"); +MODULE_LICENSE("GPL"); --=20 2.43.0