forked from mirrors/linux
gpio: of: Break out OF-only code
The core gpiolib should not contain any OF/device tree-only code. Try to break out the main part of it and push it down into the optional gpiolib-of.c part of the library. Create a local gpiolib-of.h header and move stuff around a bit to get a clean cut. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20190717071001.3858-1-linus.walleij@linaro.org
This commit is contained in:
Linus Walleij
parent
f8650b8ff6
commit
f626d6dfb7
4 changed files with 167 additions and 132 deletions
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@ -21,6 +21,34 @@
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#include <linux/gpio/machine.h>
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#include "gpiolib.h"
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#include "gpiolib-of.h"
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/*
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* This is used by external users of of_gpio_count() from <linux/of_gpio.h>
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*
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* FIXME: get rid of those external users by converting them to GPIO
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* descriptors and let them all use gpiod_get_count()
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*/
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int of_gpio_get_count(struct device *dev, const char *con_id)
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{
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int ret;
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char propname[32];
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
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if (con_id)
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snprintf(propname, sizeof(propname), "%s-%s",
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con_id, gpio_suffixes[i]);
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else
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snprintf(propname, sizeof(propname), "%s",
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gpio_suffixes[i]);
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ret = of_gpio_named_count(dev->of_node, propname);
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if (ret > 0)
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break;
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}
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return ret ? ret : -ENOENT;
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}
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static int of_gpiochip_match_node_and_xlate(struct gpio_chip *chip, void *data)
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{
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@ -53,6 +81,23 @@ static struct gpio_desc *of_xlate_and_get_gpiod_flags(struct gpio_chip *chip,
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return gpiochip_get_desc(chip, ret);
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}
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/**
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* of_gpio_need_valid_mask() - figure out if the OF GPIO driver needs
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* to set the .valid_mask
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* @dev: the device for the GPIO provider
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* @return: true if the valid mask needs to be set
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*/
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bool of_gpio_need_valid_mask(struct gpio_chip *gc)
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{
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int size;
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struct device_node *np = gc->of_node;
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size = of_property_count_u32_elems(np, "gpio-reserved-ranges");
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if (size > 0 && size % 2 == 0)
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return true;
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return false;
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}
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static void of_gpio_flags_quirks(struct device_node *np,
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const char *propname,
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enum of_gpio_flags *flags,
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@ -231,6 +276,75 @@ int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
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}
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EXPORT_SYMBOL(of_get_named_gpio_flags);
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/**
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* gpiod_get_from_of_node() - obtain a GPIO from an OF node
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* @node: handle of the OF node
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* @propname: name of the DT property representing the GPIO
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* @index: index of the GPIO to obtain for the consumer
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* @dflags: GPIO initialization flags
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* @label: label to attach to the requested GPIO
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*
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* Returns:
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* On successful request the GPIO pin is configured in accordance with
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* provided @dflags.
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*
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* In case of error an ERR_PTR() is returned.
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*/
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struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
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const char *propname, int index,
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enum gpiod_flags dflags,
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const char *label)
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{
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unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
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struct gpio_desc *desc;
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enum of_gpio_flags flags;
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bool active_low = false;
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bool single_ended = false;
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bool open_drain = false;
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bool transitory = false;
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int ret;
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desc = of_get_named_gpiod_flags(node, propname,
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index, &flags);
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if (!desc || IS_ERR(desc)) {
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return desc;
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}
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active_low = flags & OF_GPIO_ACTIVE_LOW;
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single_ended = flags & OF_GPIO_SINGLE_ENDED;
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open_drain = flags & OF_GPIO_OPEN_DRAIN;
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transitory = flags & OF_GPIO_TRANSITORY;
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ret = gpiod_request(desc, label);
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if (ret == -EBUSY && (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE))
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return desc;
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if (ret)
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return ERR_PTR(ret);
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if (active_low)
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lflags |= GPIO_ACTIVE_LOW;
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if (single_ended) {
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if (open_drain)
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lflags |= GPIO_OPEN_DRAIN;
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else
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lflags |= GPIO_OPEN_SOURCE;
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}
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if (transitory)
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lflags |= GPIO_TRANSITORY;
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ret = gpiod_configure_flags(desc, propname, lflags, dflags);
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if (ret < 0) {
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gpiod_put(desc);
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return ERR_PTR(ret);
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}
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return desc;
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}
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EXPORT_SYMBOL(gpiod_get_from_of_node);
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/*
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* The SPI GPIO bindings happened before we managed to establish that GPIO
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* properties should be named "foo-gpios" so we have this special kludge for
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45
drivers/gpio/gpiolib-of.h
Normal file
45
drivers/gpio/gpiolib-of.h
Normal file
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@ -0,0 +1,45 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef GPIOLIB_OF_H
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#define GPIOLIB_OF_H
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struct gpio_chip;
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enum of_gpio_flags;
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#ifdef CONFIG_OF_GPIO
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struct gpio_desc *of_find_gpio(struct device *dev,
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const char *con_id,
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unsigned int idx,
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unsigned long *lookupflags);
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struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
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const char *list_name, int index, enum of_gpio_flags *flags);
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int of_gpiochip_add(struct gpio_chip *gc);
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void of_gpiochip_remove(struct gpio_chip *gc);
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int of_gpio_get_count(struct device *dev, const char *con_id);
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bool of_gpio_need_valid_mask(struct gpio_chip *gc);
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#else
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static inline struct gpio_desc *of_find_gpio(struct device *dev,
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const char *con_id,
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unsigned int idx,
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unsigned long *lookupflags)
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{
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return ERR_PTR(-ENOENT);
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}
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static inline struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
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const char *list_name, int index, enum of_gpio_flags *flags)
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{
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return ERR_PTR(-ENOENT);
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}
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static inline int of_gpiochip_add(struct gpio_chip *gc) { return 0; }
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static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
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static inline int of_gpio_get_count(struct device *dev, const char *con_id)
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{
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return 0;
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}
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static inline bool of_gpio_need_valid_mask(struct gpio_chip *gc)
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{
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return false;
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}
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#endif /* CONFIG_OF_GPIO */
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#endif /* GPIOLIB_OF_H */
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@ -11,7 +11,6 @@
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/gpio.h>
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#include <linux/of_gpio.h>
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#include <linux/idr.h>
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#include <linux/slab.h>
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#include <linux/acpi.h>
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@ -30,6 +29,7 @@
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#include <uapi/linux/gpio.h>
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#include "gpiolib.h"
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#include "gpiolib-of.h"
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#define CREATE_TRACE_POINTS
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#include <trace/events/gpio.h>
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@ -360,22 +360,15 @@ static unsigned long *gpiochip_allocate_mask(struct gpio_chip *chip)
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return p;
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}
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static int gpiochip_alloc_valid_mask(struct gpio_chip *gpiochip)
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static int gpiochip_alloc_valid_mask(struct gpio_chip *gc)
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{
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#ifdef CONFIG_OF_GPIO
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int size;
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struct device_node *np = gpiochip->of_node;
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size = of_property_count_u32_elems(np, "gpio-reserved-ranges");
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if (size > 0 && size % 2 == 0)
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gpiochip->need_valid_mask = true;
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#endif
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if (!gpiochip->need_valid_mask)
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if (IS_ENABLED(CONFIG_OF_GPIO))
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gc->need_valid_mask = of_gpio_need_valid_mask(gc);
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if (!gc->need_valid_mask)
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return 0;
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gpiochip->valid_mask = gpiochip_allocate_mask(gpiochip);
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if (!gpiochip->valid_mask)
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gc->valid_mask = gpiochip_allocate_mask(gc);
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if (!gc->valid_mask)
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return -ENOMEM;
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return 0;
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@ -3993,27 +3986,6 @@ static struct gpio_desc *gpiod_find(struct device *dev, const char *con_id,
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return desc;
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}
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static int dt_gpio_count(struct device *dev, const char *con_id)
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{
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int ret;
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char propname[32];
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(gpio_suffixes); i++) {
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if (con_id)
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snprintf(propname, sizeof(propname), "%s-%s",
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con_id, gpio_suffixes[i]);
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else
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snprintf(propname, sizeof(propname), "%s",
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gpio_suffixes[i]);
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ret = of_gpio_named_count(dev->of_node, propname);
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if (ret > 0)
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break;
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}
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return ret ? ret : -ENOENT;
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}
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static int platform_gpio_count(struct device *dev, const char *con_id)
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{
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struct gpiod_lookup_table *table;
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@ -4046,7 +4018,7 @@ int gpiod_count(struct device *dev, const char *con_id)
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int count = -ENOENT;
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if (IS_ENABLED(CONFIG_OF) && dev && dev->of_node)
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count = dt_gpio_count(dev, con_id);
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count = of_gpio_get_count(dev, con_id);
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else if (IS_ENABLED(CONFIG_ACPI) && dev && ACPI_HANDLE(dev))
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count = acpi_gpio_count(dev, con_id);
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@ -4247,75 +4219,6 @@ struct gpio_desc *__must_check gpiod_get_index(struct device *dev,
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}
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EXPORT_SYMBOL_GPL(gpiod_get_index);
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/**
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* gpiod_get_from_of_node() - obtain a GPIO from an OF node
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* @node: handle of the OF node
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* @propname: name of the DT property representing the GPIO
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* @index: index of the GPIO to obtain for the consumer
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* @dflags: GPIO initialization flags
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* @label: label to attach to the requested GPIO
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*
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* Returns:
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* On successful request the GPIO pin is configured in accordance with
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* provided @dflags.
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*
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* In case of error an ERR_PTR() is returned.
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*/
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struct gpio_desc *gpiod_get_from_of_node(struct device_node *node,
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const char *propname, int index,
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enum gpiod_flags dflags,
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const char *label)
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{
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unsigned long lflags = GPIO_LOOKUP_FLAGS_DEFAULT;
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struct gpio_desc *desc;
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enum of_gpio_flags flags;
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bool active_low = false;
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bool single_ended = false;
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bool open_drain = false;
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bool transitory = false;
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int ret;
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desc = of_get_named_gpiod_flags(node, propname,
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index, &flags);
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if (!desc || IS_ERR(desc)) {
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return desc;
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}
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active_low = flags & OF_GPIO_ACTIVE_LOW;
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single_ended = flags & OF_GPIO_SINGLE_ENDED;
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open_drain = flags & OF_GPIO_OPEN_DRAIN;
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transitory = flags & OF_GPIO_TRANSITORY;
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ret = gpiod_request(desc, label);
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if (ret == -EBUSY && (flags & GPIOD_FLAGS_BIT_NONEXCLUSIVE))
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return desc;
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if (ret)
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return ERR_PTR(ret);
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if (active_low)
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lflags |= GPIO_ACTIVE_LOW;
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if (single_ended) {
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if (open_drain)
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lflags |= GPIO_OPEN_DRAIN;
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else
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lflags |= GPIO_OPEN_SOURCE;
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}
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if (transitory)
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lflags |= GPIO_TRANSITORY;
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ret = gpiod_configure_flags(desc, propname, lflags, dflags);
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if (ret < 0) {
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gpiod_put(desc);
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return ERR_PTR(ret);
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}
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return desc;
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}
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EXPORT_SYMBOL(gpiod_get_from_of_node);
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/**
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* fwnode_get_named_gpiod - obtain a GPIO from firmware node
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* @fwnode: handle of the firmware node
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@ -16,7 +16,6 @@
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#include <linux/module.h>
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#include <linux/cdev.h>
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enum of_gpio_flags;
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struct acpi_device;
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/**
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@ -92,32 +91,6 @@ struct acpi_gpio_info {
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/* gpio suffixes used for ACPI and device tree lookup */
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static __maybe_unused const char * const gpio_suffixes[] = { "gpios", "gpio" };
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#ifdef CONFIG_OF_GPIO
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struct gpio_desc *of_find_gpio(struct device *dev,
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const char *con_id,
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unsigned int idx,
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unsigned long *lookupflags);
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struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
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const char *list_name, int index, enum of_gpio_flags *flags);
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int of_gpiochip_add(struct gpio_chip *gc);
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void of_gpiochip_remove(struct gpio_chip *gc);
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#else
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static inline struct gpio_desc *of_find_gpio(struct device *dev,
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const char *con_id,
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unsigned int idx,
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unsigned long *lookupflags)
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{
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return ERR_PTR(-ENOENT);
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}
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static inline struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
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const char *list_name, int index, enum of_gpio_flags *flags)
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{
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return ERR_PTR(-ENOENT);
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}
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static inline int of_gpiochip_add(struct gpio_chip *gc) { return 0; }
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static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
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#endif /* CONFIG_OF_GPIO */
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#ifdef CONFIG_ACPI
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void acpi_gpiochip_add(struct gpio_chip *chip);
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void acpi_gpiochip_remove(struct gpio_chip *chip);
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