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8dc1969744
Documentation/devicetree/bindings/gpio/gpio.txt says: "The names are assigned starting from line offset 0 from left to right from the passed array. An incomplete array (where the number of passed named are less than ngpios) will still be used up until the last provided valid line index". This patch makes it actually work this way. Signed-off-by: Christophe Blaess <christophe.blaess@logilin.fr> Signed-off-by: Patrick Boettcher <p@yai.se> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Device property helpers for GPIO chips.
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*
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* Copyright (C) 2016, Intel Corporation
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#include <linux/property.h>
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#include <linux/slab.h>
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/driver.h>
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#include "gpiolib.h"
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/**
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* devprop_gpiochip_set_names - Set GPIO line names using device properties
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* @chip: GPIO chip whose lines should be named, if possible
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* @fwnode: Property Node containing the gpio-line-names property
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*
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* Looks for device property "gpio-line-names" and if it exists assigns
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* GPIO line names for the chip. The memory allocated for the assigned
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* names belong to the underlying firmware node and should not be released
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* by the caller.
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*/
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void devprop_gpiochip_set_names(struct gpio_chip *chip,
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const struct fwnode_handle *fwnode)
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{
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struct gpio_device *gdev = chip->gpiodev;
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const char **names;
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int ret, i;
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int count;
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count = fwnode_property_read_string_array(fwnode, "gpio-line-names",
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NULL, 0);
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if (count < 0)
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return;
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if (count > gdev->ngpio)
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count = gdev->ngpio;
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names = kcalloc(count, sizeof(*names), GFP_KERNEL);
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if (!names)
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return;
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ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
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names, count);
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if (ret < 0) {
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dev_warn(&gdev->dev, "failed to read GPIO line names\n");
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kfree(names);
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return;
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}
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for (i = 0; i < count; i++)
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gdev->descs[i].name = names[i];
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kfree(names);
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}
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