blob: f748aa3e77f72000b357718d5c955abba38c5c07 [file] [log] [blame]
* Device property helpers for GPIO chips.
* Copyright (C) 2016, Intel Corporation
* Author: Mika Westerberg <>
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
#include <linux/property.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.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;
ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
NULL, 0);
if (ret < 0)
if (ret != gdev->ngpio) {
"names %d do not match number of GPIOs %d\n", ret,
names = kcalloc(gdev->ngpio, sizeof(*names), GFP_KERNEL);
if (!names)
ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
names, gdev->ngpio);
if (ret < 0) {
dev_warn(&gdev->dev, "failed to read GPIO line names\n");
for (i = 0; i < gdev->ngpio; i++)
gdev->descs[i].name = names[i];