blob: 53781b2539867b26fb589d527b9524ad0450e5b4 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0
* Device property helpers for GPIO chips.
* Copyright (C) 2016, Intel Corporation
* Author: Mika Westerberg <>
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/export.h>
#include "gpiolib.h"
* devprop_gpiochip_set_names - Set GPIO line names using device properties
* @chip: GPIO chip whose lines should be named, if possible
* @fwnode: Property Node containing the gpio-line-names property
* Looks for device property "gpio-line-names" and if it exists assigns
* GPIO line names for the chip. The memory allocated for the assigned
* names belong to the underlying firmware node and should not be released
* by the caller.
void devprop_gpiochip_set_names(struct gpio_chip *chip,
const struct fwnode_handle *fwnode)
struct gpio_device *gdev = chip->gpiodev;
const char **names;
int ret, i;
int count;
count = fwnode_property_read_string_array(fwnode, "gpio-line-names",
NULL, 0);
if (count < 0)
if (count > gdev->ngpio)
count = gdev->ngpio;
names = kcalloc(count, sizeof(*names), GFP_KERNEL);
if (!names)
ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
names, count);
if (ret < 0) {
dev_warn(&gdev->dev, "failed to read GPIO line names\n");
for (i = 0; i < count; i++)
gdev->descs[i].name = names[i];