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charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20260910-ad7768-gpio-v8-3-6aaaa15adeb3@analog.com> References: <20260910-ad7768-gpio-v8-0-6aaaa15adeb3@analog.com> In-Reply-To: <20260910-ad7768-gpio-v8-0-6aaaa15adeb3@analog.com> To: Michael Walle , Linus Walleij , Bartosz Golaszewski CC: , , =?utf-8?q?Nuno_S=C3=A1?= , Jonathan Cameron , Andy Shevchenko , Janani Sunil , Janani Sunil X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1789061359; l=5661; i=janani.sunil@analog.com; s=20260903; h=from:subject:message-id; bh=qj04lnfabPkO4RhURI7w92r5/cwoXH0pgIJukWhuhBA=; b=A0f9/jZZyvSxWIaCIJmuDhNV8hu5nAvDbjdrJ07cDIFLFwr3ZBVoFL9d3zy/+1CTKcj/e+25+ EayJFyK49BOAersCedgdEkDD0S0slUTvgG4gWjBPu46/tySMBgJJpfy X-Developer-Key: i=janani.sunil@analog.com; a=ed25519; pk=0UJo4rLJeMHBMco/+wcMHzXI7nV8k1T72+XQlBNV4Rw= X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Spam-Info: AW1haW4tMjYwOTEwMDIxNCBTYWx0ZWRfX7ki4cBU6iqlx klhZryDWLajUv4vPU5jIj7t8XzoCROLXka7yeOr57ZRLWZA/Gr06NfX6/fbDGC92rjMoD1Tf5dJ 567tD9XSz+AN8g0rwdgNMxJXP4Y7TR3qBokhTRUWo9vm1Zfg8ceC X-Proofpoint-GUID: ktNsYz2yY6mlNYCMt5ZRrw2rD6lZXIT6 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwOTEwMDIxNCBTYWx0ZWRfX0Tjv4jNtfDrD WXr9iAqqBcLy8a6UAFyGDGraRPUyimTDJncEfZXNALhC58ljb5EQmRPknDXZCvp+bd9Ts26rXG9 Qeg/2SqZAicgKzZsGFTu4z21Mqhky6A45GS4nDmR7m4dtSF4J+iK3ES8UIhETeaTET5zrbKrMF5 q3cWj1AGojTEsk/h5ecIFWOqoTtQJkJ7aYQHQhejbhBO7heh3t2l/UAR9dcYG+YXg/F2xapkY4v HTVMNdIRPtA5l6KXUeiUUvhBPUGulIVRn95+w6ILNls3KiYQELhc8Ptdkp6KVU6PkhGpQaUiN15 zHxVFGIF4v6/ZYa7gE33sd8vLf+CgwUoP6sypw8ZpKsJosD+FcnIYg7TaXmOpE6tOuMlXRf1wxm SAPTpR3W1yIcFIUrA6eBqh7G1f+1XN/Nwh/4GK2ek2TZU4EFJh80Dh1pSih7Qn/1es6y6qLV81p /EWaBC3ctcNXDxVdxdQ== X-Authority-Analysis: v=2.4 cv=G8CJgNk5 c=1 sm=1 tr=0 ts=6aa2e8ff cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=VdqzKS8jKosA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=uXIjobp8t2wMuQ0fPvqm:22 a=QyXUC8HyAAAA:8 a=VwQbUJbxAAAA:8 a=gAnH3GRIAAAA:8 a=8fq82CzG31171KfXEYkA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: ktNsYz2yY6mlNYCMt5ZRrw2rD6lZXIT6 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-09-10_05,2026-09-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 adultscore=0 malwarescore=0 priorityscore=1501 bulkscore=0 lowpriorityscore=0 impostorscore=0 phishscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2609040000 definitions=main-2609100214 The AD7768 provides five GPIOs controlled through registers shared with the parent IIO device. Register an auxiliary gpio-regmap driver and use the parent device for runtime PM. The device has separate input-state and output-latch registers. Add a reg_mask_xlate() callback that checks the line direction and reads the programmed output latch for output lines while retaining input-state reads for input lines. Reviewed-by: Andy Shevchenko Reviewed-by: Linus Walleij Signed-off-by: Janani Sunil --- drivers/gpio/Kconfig | 12 +++++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-ad7768.c | 121 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 134 insertions(+) diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index a48586bb8edb..07b7f8ab0ccb 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1818,6 +1818,18 @@ endmenu menu "Auxiliary Bus GPIO drivers" depends on AUXILIARY_BUS +config GPIO_AD7768 + tristate "Analog Devices AD7768 GPIO support" + depends on AD7768 + depends on GPIOLIB + select GPIO_REGMAP + help + Say yes here to expose the AD7768 utility pins as GPIOs when the + device tree node is marked as a GPIO controller. + + To compile this driver as a module, choose M here: the module will be + called gpio-ad7768. + config GPIO_LTC4283 tristate "Analog Devices LTC4283 GPIO support" depends on SENSORS_LTC4283 diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile index dc9e6d643b5b..ce56e9b3f55d 100644 --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -27,6 +27,7 @@ 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-$(CONFIG_GPIO_AD7768) += gpio-ad7768.o obj-$(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-ad7768.c b/drivers/gpio/gpio-ad7768.c new file mode 100644 index 000000000000..c37e1ac30612 --- /dev/null +++ b/drivers/gpio/gpio-ad7768.c @@ -0,0 +1,121 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Analog Devices AD7768 GPIO auxiliary driver + * + * Copyright 2026 Analog Devices Inc. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define AD7768_REG_GPIO_CONTROL 0x0E +#define AD7768_GPIO_UGPIO_ENABLE BIT(7) + +#define AD7768_REG_GPIO_WRITE 0x0F +#define AD7768_REG_GPIO_READ 0x10 + +#define AD7768_NUM_GPIOS 5 +#define AD7768_FILTER_GPIO 4 + +static int ad7768_gpio_init_valid_mask(struct gpio_chip *gc, + unsigned long *valid_mask, + unsigned int ngpios) +{ + if (ngpios > AD7768_FILTER_GPIO && + fwnode_property_match_string(gc->fwnode, "clock-names", "mclk") < 0) + __clear_bit(AD7768_FILTER_GPIO, valid_mask); + + return 0; +} + +static int ad7768_gpio_reg_mask_xlate(struct gpio_regmap *gpio, + enum gpio_regmap_operation op, + unsigned int base, unsigned int offset, + unsigned int *reg, unsigned int *mask) +{ + struct regmap *regmap = gpio_regmap_get_drvdata(gpio); + int ret; + + *reg = base; + *mask = BIT(offset); + + if (op != GPIO_REGMAP_GET_OP) + return 0; + + /* + * AD7768 has separate input-state and output-latch registers. For an + * output line, report the programmed value from the output latch; + * input lines continue to use the input-state register. + */ + ret = regmap_test_bits(regmap, AD7768_REG_GPIO_CONTROL, *mask); + if (ret < 0) + return ret; + if (ret) + *reg = AD7768_REG_GPIO_WRITE; + + return 0; +} + +static int ad7768_gpio_probe(struct auxiliary_device *adev, + const struct auxiliary_device_id *id) +{ + struct gpio_regmap_config config; + struct device *dev = &adev->dev; + struct device *parent = dev->parent; + struct regmap *map; + int ret; + + map = dev_get_regmap(parent, NULL); + if (!map) + return -ENODEV; + + PM_RUNTIME_ACQUIRE_AUTOSUSPEND(parent, pm); + ret = PM_RUNTIME_ACQUIRE_ERR(&pm); + if (ret) + return ret; + + ret = regmap_set_bits(map, AD7768_REG_GPIO_CONTROL, AD7768_GPIO_UGPIO_ENABLE); + if (ret) + return ret; + + config = (struct gpio_regmap_config) { + .parent = dev, + .regmap = map, + .label = dev_name(parent), + .ngpio = AD7768_NUM_GPIOS, + .reg_dat_base = AD7768_REG_GPIO_READ, + .reg_set_base = AD7768_REG_GPIO_WRITE, + .reg_dir_out_base = AD7768_REG_GPIO_CONTROL, + .pm_dev = parent, + .fwnode = dev_fwnode(parent), + .reg_mask_xlate = ad7768_gpio_reg_mask_xlate, + .init_valid_mask = ad7768_gpio_init_valid_mask, + .drvdata = map, + }; + + return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &config)); +} + +static const struct auxiliary_device_id ad7768_gpio_ids[] = { + { .name = "ad7768.gpio" }, + { } +}; +MODULE_DEVICE_TABLE(auxiliary, ad7768_gpio_ids); + +static struct auxiliary_driver ad7768_gpio_driver = { + .probe = ad7768_gpio_probe, + .id_table = ad7768_gpio_ids, +}; +module_auxiliary_driver(ad7768_gpio_driver); + +MODULE_AUTHOR("Janani Sunil "); +MODULE_DESCRIPTION("Analog Devices AD7768 GPIO auxiliary driver"); +MODULE_LICENSE("GPL"); -- 2.43.0