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Fri, 21 Aug 2026 10:08:49 -0400 From: Janani Sunil Date: Fri, 21 Aug 2026 16:07:06 +0200 Subject: [PATCH v4 13/14] gpio: ad7768: Add AD7768 GPIO auxiliary driver Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-ID: <20260821-ad7768-driver-v4-13-bb8fbd06d4eb@analog.com> References: <20260821-ad7768-driver-v4-0-bb8fbd06d4eb@analog.com> In-Reply-To: <20260821-ad7768-driver-v4-0-bb8fbd06d4eb@analog.com> To: =?utf-8?q?Nuno_S=C3=A1?= , Michael Hennerich , Jonathan Cameron , "David Lechner" , Andy Shevchenko , "Rob Herring" , Krzysztof Kozlowski , "Conor Dooley" , Olivier Moysan , Philipp Zabel , Linus Walleij , Bartosz Golaszewski , Jonathan Corbet , Shuah Khan , Michael Walle CC: , , , , , , , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Janani Sunil X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1787321240; l=5816; i=janani.sunil@analog.com; s=20260507; h=from:subject:message-id; bh=q/TL1NVykNjMWtW8Lil45SStrRj/mHgaltCNPIn4ZwY=; b=5AXU9WabCGasZuJk6dmDzqrw96Q0IOwIIkctTJ5Sc950hIHI5mxoRIix7ubgm8UkG1ud3xOwf PtPU35YgE+WAMpRzBq4eaEHAuyFh5nuMGhwHgEO1x1WuRRYOM3w2BCt X-Developer-Key: i=janani.sunil@analog.com; a=ed25519; pk=e25MyjRLPY3RWrYm/LrJ+/+t1MZJUbkgIW5CZg+g+hA= X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Spam-Info: AW1haW4tMjYwODIxMDEwOSBTYWx0ZWRfX6anSvWIlT5Fz QDI57XWUW8GMmFHjePx18AkGRd2lyEOBfkzhDCfXX/SVBRX1lir6YqvY9WfdaNgAZ3W7DIVcf/D QEmtMi3fHXPkg8VUn9u7E10rr3kUOQoDrpwKsNKf2sJmmieEZCrA X-Proofpoint-ORIG-GUID: x8QRgIsPt2eDyWCFGqJ1XNwxpX88OiAG X-Proofpoint-GUID: x8QRgIsPt2eDyWCFGqJ1XNwxpX88OiAG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODIxMDEwOSBTYWx0ZWRfXwlQWt5hRHH6d 1sawBqx9MS9hTtziPDfboHcThKmRyOtXW69PZ3nXLeExdVTbb2MTN8iI+jR5g4ysz2sP2phey2q h6zJJslEFglv6M08hBIrAKTLuXewA647i8CSB8yuNfbYUwxpuIrb4cQcFMm8QUPea4Ho4F/QcFV rPW7qLXQSrDNVoV08FtPQN8KP2yZc2hqvWYidaO/Fye9dXSBrEYdMfW43wOadm0XnyTTBGSy4+2 6JRA3wdY2gDkxy1eNwalLM1+4tSFvrJwx7hoQIvGMwosqbmzUQWJjVT9D5aHq4ChrnnRoJbq5GE /gQtSApPXZJqkjn7aKu0uQ1HKnUeA/3rH+S8yJvKKnZIYN4w9qaz/+f228u+mraBwUbp7FSQdQ+ nMK+BPZrQb+pDmKsjdJvqsFjxSOE05MXr+Ru0vpW0BKDggl/gwqC/xYCYYrriNyuEKaPBZNnhpR HOPQL5RuE9vk6J5e6Rg== X-Authority-Analysis: v=2.4 cv=baVbluPB c=1 sm=1 tr=0 ts=6a885bfc cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=OmVn7CZJonkx5R5zMQLL:22 a=gAnH3GRIAAAA:8 a=VwQbUJbxAAAA:8 a=DyYY1DdFIiypQHwlAEwA:9 a=QEXdDO2ut3YA:10 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=2026-08-21_04,2026-08-21_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 phishscore=0 spamscore=0 suspectscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 malwarescore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608210109 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. Signed-off-by: Janani Sunil --- MAINTAINERS | 1 + drivers/gpio/Kconfig | 12 +++++ drivers/gpio/Makefile | 1 + drivers/gpio/gpio-ad7768.c | 118 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 132 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index dc94e7803a7c..3de7ebcc4ee7 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1639,6 +1639,7 @@ L: linux-iio@vger.kernel.org S: Supported W: https://ez.analog.com/linux-software-drivers F: Documentation/devicetree/bindings/iio/adc/adi,ad7768.yaml +F: drivers/gpio/gpio-ad7768.c F: drivers/iio/adc/ad7768.c ANALOG DEVICES INC AD7780 DRIVER diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index 28cf6d2e83c2..85cb0c82a823 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1796,6 +1796,18 @@ 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 4d0e900402fc..d2921963efc7 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..710739e33dff --- /dev/null +++ b/drivers/gpio/gpio-ad7768.c @@ -0,0 +1,118 @@ +// 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 + +static int ad7768_gpio_init_valid_mask(struct gpio_chip *gc, + unsigned long *valid_mask, + unsigned int ngpios) +{ + unsigned long *mask = dev_get_platdata(gc->parent); + + bitmap_copy(valid_mask, mask, ngpios); + + return 0; +} + +static int ad7768_gpio_reg_mask_xlate(struct gpio_regmap *gpio, + 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 (base != AD7768_REG_GPIO_READ) + 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 device *parent = adev->dev.parent; + struct gpio_regmap_config config = { + .parent = &adev->dev, + .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, + .reg_mask_xlate = ad7768_gpio_reg_mask_xlate, + .init_valid_mask = ad7768_gpio_init_valid_mask, + }; + struct gpio_regmap *gpio; + 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.regmap = map; + config.drvdata = map; + + gpio = devm_gpio_regmap_register(&adev->dev, &config); + return PTR_ERR_OR_ZERO(gpio); +} + +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