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Message-ID: <20251117091427.3624-3-antoniu.miclaus@analog.com>
Date: Mon, 17 Nov 2025 09:13:23 +0000
From: Antoniu Miclaus <antoniu.miclaus@...log.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Bartosz Golaszewski <brgl@...ev.pl>,
Antoniu Miclaus
<antoniu.miclaus@...log.com>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-gpio@...r.kernel.org>
Subject: [PATCH v3 2/2] gpio: adg1712: add driver support
Add driver support for the ADG1712, which contains four independent
single-pole/single-throw (SPST) switches and operates with a
low-voltage single supply range from +1.08V to +5.5V or a low-voltage
dual supply range from ±1.08V to ±2.75V.
The driver configures switches once at probe time based on device tree
properties and does not expose any userspace interface for runtime control.
Signed-off-by: Antoniu Miclaus <antoniu.miclaus@...log.com>
---
Changes in v3:
- Remove GPIO controller interface
- Configure switches from device tree at probe time only
- Add 'switch-states' property parsing
- Change from GPIOD_ASIS to GPIOD_OUT_LOW
---
drivers/gpio/Kconfig | 9 ++++
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-adg1712.c | 87 +++++++++++++++++++++++++++++++++++++
3 files changed, 97 insertions(+)
create mode 100644 drivers/gpio/gpio-adg1712.c
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 7ee3afbc2b05..3fac05823eae 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -157,6 +157,15 @@ config GPIO_74XX_MMIO
8 bits: 74244 (Input), 74273 (Output)
16 bits: 741624 (Input), 7416374 (Output)
+config GPIO_ADG1712
+ tristate "Analog Devices ADG1712 quad SPST switch GPIO driver"
+ depends on GPIOLIB
+ help
+ GPIO driver for Analog Devices ADG1712 quad single-pole,
+ single-throw (SPST) switch. The driver provides a GPIO controller
+ interface where each GPIO line controls one of the four independent
+ analog switches on the ADG1712.
+
config GPIO_ALTERA
tristate "Altera GPIO"
select GPIOLIB_IRQCHIP
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index ec296fa14bfd..9043d2d07a15 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_GPIO_104_IDI_48) += gpio-104-idi-48.o
obj-$(CONFIG_GPIO_104_IDIO_16) += gpio-104-idio-16.o
obj-$(CONFIG_GPIO_74X164) += gpio-74x164.o
obj-$(CONFIG_GPIO_74XX_MMIO) += gpio-74xx-mmio.o
+obj-$(CONFIG_GPIO_ADG1712) += gpio-adg1712.o
obj-$(CONFIG_GPIO_ADNP) += gpio-adnp.o
obj-$(CONFIG_GPIO_ADP5520) += gpio-adp5520.o
obj-$(CONFIG_GPIO_ADP5585) += gpio-adp5585.o
diff --git a/drivers/gpio/gpio-adg1712.c b/drivers/gpio/gpio-adg1712.c
new file mode 100644
index 000000000000..86f8645cf2ad
--- /dev/null
+++ b/drivers/gpio/gpio-adg1712.c
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices ADG1712 quad SPST switch driver
+ *
+ * Copyright 2025 Analog Devices Inc.
+ *
+ * Author: Antoniu Miclaus <antoniu.miclaus@...log.com>
+ */
+
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+#define ADG1712_NUM_SWITCHES 4
+
+struct adg1712 {
+ struct gpio_descs *switch_gpios;
+};
+
+static int adg1712_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct adg1712 *adg1712;
+ u32 switch_states[ADG1712_NUM_SWITCHES] = {0}; /* Default all switches off */
+ int ret, i;
+
+ adg1712 = devm_kzalloc(dev, sizeof(*adg1712), GFP_KERNEL);
+ if (!adg1712)
+ return -ENOMEM;
+
+ adg1712->switch_gpios = devm_gpiod_get_array(dev, "switch", GPIOD_OUT_LOW);
+ if (IS_ERR(adg1712->switch_gpios))
+ return dev_err_probe(dev, PTR_ERR(adg1712->switch_gpios),
+ "failed to get switch gpios\n");
+
+ if (adg1712->switch_gpios->ndescs != ADG1712_NUM_SWITCHES)
+ return dev_err_probe(dev, -EINVAL,
+ "expected %d gpios, got %d\n",
+ ADG1712_NUM_SWITCHES,
+ adg1712->switch_gpios->ndescs);
+
+ ret = device_property_read_u32_array(dev, "switch-states", switch_states,
+ ADG1712_NUM_SWITCHES);
+ if (ret && ret != -EINVAL)
+ return dev_err_probe(dev, ret, "failed to read switch-states\n");
+
+ for (i = 0; i < ADG1712_NUM_SWITCHES; i++) {
+ if (switch_states[i] > 1) {
+ dev_warn(dev, "invalid switch state %u for switch %d, using 0\n",
+ switch_states[i], i);
+ switch_states[i] = 0;
+ }
+
+ ret = gpiod_set_value_cansleep(adg1712->switch_gpios->desc[i],
+ switch_states[i]);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to set switch %d\n", i);
+ }
+
+ platform_set_drvdata(pdev, adg1712);
+
+ dev_info(dev, "ADG1712 switch controller configured\n");
+
+ return 0;
+}
+
+static const struct of_device_id adg1712_dt_ids[] = {
+ { .compatible = "adi,adg1712", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, adg1712_dt_ids);
+
+static struct platform_driver adg1712_driver = {
+ .driver = {
+ .name = "adg1712",
+ .of_match_table = adg1712_dt_ids,
+ },
+ .probe = adg1712_probe,
+};
+module_platform_driver(adg1712_driver);
+
+MODULE_DESCRIPTION("Analog Devices ADG1712 quad SPST switch driver");
+MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@...log.com>");
+MODULE_LICENSE("GPL");
--
2.43.0
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