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Following commit9427ecbed4("gpio: Rework of_gpiochip_set_names() to use device property accessors"), "gpio-line-names" DT property is not retrieved anymore when chip->parent is not set by the driver. This is due to OF based property reads having been replaced by device based property reads. This patch fixes that by making use of fwnode_property_read_string_array() instead of device_property_read_string_array() and handing over either of_fwnode_handle(chip->of_node) or dev_fwnode(chip->parent) to that function. Fixes:9427ecbed4("gpio: Rework of_gpiochip_set_names() to use device property accessors") Cc: stable@vger.kernel.org Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
65 lines
1.7 KiB
C
65 lines
1.7 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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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ret = fwnode_property_read_string_array(fwnode, "gpio-line-names",
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NULL, 0);
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if (ret < 0)
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return;
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if (ret != gdev->ngpio) {
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dev_warn(&gdev->dev,
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"names %d do not match number of GPIOs %d\n", ret,
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gdev->ngpio);
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return;
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}
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names = kcalloc(gdev->ngpio, 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, gdev->ngpio);
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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 < gdev->ngpio; 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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