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Mon, 5 Jan 2026 07:03:59 -0500 From: Antoniu Miclaus To: Peter Rosin , Rob Herring , "Krzysztof Kozlowski" , Conor Dooley , "Antoniu Miclaus" , Greg Kroah-Hartman , Arnd Bergmann , , Subject: [PATCH v2 2/2] mux: adg2404: add driver support Date: Mon, 5 Jan 2026 14:00:31 +0200 Message-ID: <20260105120117.57607-3-antoniu.miclaus@analog.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260105120117.57607-1-antoniu.miclaus@analog.com> References: <20260105120117.57607-1-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-Authority-Analysis: v=2.4 cv=b4C/I9Gx c=1 sm=1 tr=0 ts=695ba8b8 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=gAnH3GRIAAAA:8 a=o4IEqcIzuIU0VZSRl5oA:9 X-Proofpoint-GUID: AvLNWCWROnp7E7e5B4FykpW_9wMRERHs X-Proofpoint-ORIG-GUID: AvLNWCWROnp7E7e5B4FykpW_9wMRERHs X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTA1MDEwNSBTYWx0ZWRfX0vGOz21U6R3P YyMfDlKeXsOSh3Nhd4k+02S9MHpbxLMDrmBW7fn3Usg6kpcy4tFery5x/nsaUK6Rlfqjvq//20g ObE6AYm/U8mlO++y8t15dN0U1bU2jovATBu+ZzIASReHmTeR4UkyUmufcQtAyXztxYJQ7xyiASB ONzoICP9eZzNiJf7EBe0w8xn1/FTfY0jLSYOapXNJ1f7av1Uj38vjTf1OFe7vxcrNF8zxses2+N U7VzEtdJV2y9MvnRT79sp3ZsNEy3kcj5cMqAzPSTKy9wH0nRt2AR4WIFGO8QVye8G3mEcQaW3ut T2JILl8GfceaCvGlWg/5GXRGhQ8rhwhb4ijCX7qIXoORpCAitkJ7veBDvsuddDIAle+3h/cFfRG aPjvybTaFmZip16K8WmnL5pJn1O86CNfiVmDlYRHbadvzlJAagk6seZ5LmqTeT/NT0eTtHA4VtC XaVGOKMT5L+pvhdBr9Q== 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=2026-01-05_01,2025-12-31_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 bulkscore=0 malwarescore=0 adultscore=0 lowpriorityscore=0 phishscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2512120000 definitions=main-2601050105 Content-Type: text/plain; charset="utf-8" Add support for ADG2404, a 4:1 analog multiplexer. Signed-off-by: Antoniu Miclaus --- changes in v2: * rename addr_gpios to mux_gpios * rename en_gpio to enable_gpio * update GPIO names: "addr" to "mux", "en" to "enable" * remove dev_info message --- drivers/mux/Kconfig | 12 ++++ drivers/mux/Makefile | 2 + drivers/mux/adg2404.c | 130 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 144 insertions(+) create mode 100644 drivers/mux/adg2404.c diff --git a/drivers/mux/Kconfig b/drivers/mux/Kconfig index c68132e38138..5aba66e6e210 100644 --- a/drivers/mux/Kconfig +++ b/drivers/mux/Kconfig @@ -9,6 +9,18 @@ config MULTIPLEXER menu "Multiplexer drivers" depends on MULTIPLEXER =20 +config MUX_ADG2404 + tristate "Analog Devices ADG2404 Multiplexer" + depends on GPIOLIB || COMPILE_TEST + help + ADG2404 4:1 single-ended analog multiplexer controlled by GPIO. + + The multiplexer state is controlled by 3 GPIO pins: A0, A1 + (address selection) and EN (enable). + + To compile the driver as a module, choose M here: the module will + be called mux-adg2404. + config MUX_ADG792A tristate "Analog Devices ADG792A/ADG792G Multiplexers" depends on I2C diff --git a/drivers/mux/Makefile b/drivers/mux/Makefile index 6e9fa47daf56..d3df403f8978 100644 --- a/drivers/mux/Makefile +++ b/drivers/mux/Makefile @@ -4,12 +4,14 @@ # =20 mux-core-objs :=3D core.o +mux-adg2404-objs :=3D adg2404.o mux-adg792a-objs :=3D adg792a.o mux-adgs1408-objs :=3D adgs1408.o mux-gpio-objs :=3D gpio.o mux-mmio-objs :=3D mmio.o =20 obj-$(CONFIG_MULTIPLEXER) +=3D mux-core.o +obj-$(CONFIG_MUX_ADG2404) +=3D mux-adg2404.o obj-$(CONFIG_MUX_ADG792A) +=3D mux-adg792a.o obj-$(CONFIG_MUX_ADGS1408) +=3D mux-adgs1408.o obj-$(CONFIG_MUX_GPIO) +=3D mux-gpio.o diff --git a/drivers/mux/adg2404.c b/drivers/mux/adg2404.c new file mode 100644 index 000000000000..11c3b81ff481 --- /dev/null +++ b/drivers/mux/adg2404.c @@ -0,0 +1,130 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Analog Devices ADG2404 4:1 multiplexer driver + * + * Copyright 2025 Analog Devices Inc. + * + * Author: Antoniu Miclaus + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define ADG2404_CHANNELS 4 + +struct adg2404_mux { + struct gpio_descs *mux_gpios; + struct gpio_desc *enable_gpio; +}; + +static int adg2404_set(struct mux_control *mux, int state) +{ + struct adg2404_mux *adg2404 =3D mux_chip_priv(mux->chip); + DECLARE_BITMAP(values, BITS_PER_TYPE(state)); + u32 value =3D state; + + if (state =3D=3D MUX_IDLE_DISCONNECT) { + gpiod_set_value_cansleep(adg2404->enable_gpio, 0); + return 0; + } + + /* + * Disable the mux before changing address lines to prevent + * glitches. Changing address while enabled could briefly activate + * an unintended channel during the transition. + */ + gpiod_set_value_cansleep(adg2404->enable_gpio, 0); + + bitmap_from_arr32(values, &value, BITS_PER_TYPE(value)); + gpiod_set_array_value_cansleep(adg2404->mux_gpios->ndescs, + adg2404->mux_gpios->desc, + adg2404->mux_gpios->info, + values); + + /* Enable the mux with the new address */ + gpiod_set_value_cansleep(adg2404->enable_gpio, 1); + + return 0; +} + +static const struct mux_control_ops adg2404_ops =3D { + .set =3D adg2404_set, +}; + +static int adg2404_probe(struct platform_device *pdev) +{ + struct device *dev =3D &pdev->dev; + struct mux_chip *mux_chip; + struct adg2404_mux *adg2404; + s32 idle_state; + int ret; + + mux_chip =3D devm_mux_chip_alloc(dev, 1, sizeof(*adg2404)); + if (IS_ERR(mux_chip)) + return PTR_ERR(mux_chip); + + adg2404 =3D mux_chip_priv(mux_chip); + mux_chip->ops =3D &adg2404_ops; + + adg2404->mux_gpios =3D devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW); + if (IS_ERR(adg2404->mux_gpios)) + return dev_err_probe(dev, PTR_ERR(adg2404->mux_gpios), + "failed to get mux gpios\n"); + + if (adg2404->mux_gpios->ndescs !=3D 2) + return dev_err_probe(dev, -EINVAL, + "mux-gpios must have exactly 2 GPIOs\n"); + + adg2404->enable_gpio =3D devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(adg2404->enable_gpio)) + return dev_err_probe(dev, PTR_ERR(adg2404->enable_gpio), + "failed to get enable gpio\n"); + + mux_chip->mux->states =3D ADG2404_CHANNELS; + + ret =3D device_property_read_u32(dev, "idle-state", (u32 *)&idle_state); + if (ret < 0) + idle_state =3D MUX_IDLE_AS_IS; + + switch (idle_state) { + case MUX_IDLE_DISCONNECT: + case MUX_IDLE_AS_IS: + case 0 ... ADG2404_CHANNELS - 1: + mux_chip->mux->idle_state =3D idle_state; + break; + default: + dev_err(dev, "invalid idle-state %d\n", idle_state); + return -EINVAL; + } + + ret =3D devm_mux_chip_register(dev, mux_chip); + if (ret < 0) + return ret; + + return 0; +} + +static const struct of_device_id adg2404_dt_ids[] =3D { + { .compatible =3D "adi,adg2404", }, + { } +}; +MODULE_DEVICE_TABLE(of, adg2404_dt_ids); + +static struct platform_driver adg2404_driver =3D { + .driver =3D { + .name =3D "adg2404", + .of_match_table =3D adg2404_dt_ids, + }, + .probe =3D adg2404_probe, +}; +module_platform_driver(adg2404_driver); + +MODULE_DESCRIPTION("Analog Devices ADG2404 multiplexer driver"); +MODULE_AUTHOR("Antoniu Miclaus "); +MODULE_LICENSE("GPL"); --=20 2.43.0