1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_GPIO_DRIVER_H
3 #define __LINUX_GPIO_DRIVER_H
5 #include <linux/device.h>
7 #include <linux/irqchip/chained_irq.h>
8 #include <linux/irqdomain.h>
9 #include <linux/lockdep.h>
10 #include <linux/pinctrl/pinctrl.h>
11 #include <linux/pinctrl/pinconf-generic.h>
12 #include <linux/property.h>
13 #include <linux/types.h>
16 struct of_phandle_args;
22 enum gpio_lookup_flags;
26 #define GPIO_LINE_DIRECTION_IN 1
27 #define GPIO_LINE_DIRECTION_OUT 0
30 * struct gpio_irq_chip - GPIO interrupt controller
32 struct gpio_irq_chip {
36 * GPIO IRQ chip implementation, provided by GPIO driver.
38 struct irq_chip *chip;
43 * Interrupt translation domain; responsible for mapping between GPIO
44 * hwirq number and Linux IRQ number.
46 struct irq_domain *domain;
51 * Table of interrupt domain operations for this IRQ chip.
53 const struct irq_domain_ops *domain_ops;
55 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
59 * Firmware node corresponding to this gpiochip/irqchip, necessary
60 * for hierarchical irqdomain support.
62 struct fwnode_handle *fwnode;
67 * If non-NULL, will be set as the parent of this GPIO interrupt
68 * controller's IRQ domain to establish a hierarchical interrupt
69 * domain. The presence of this will activate the hierarchical
72 struct irq_domain *parent_domain;
75 * @child_to_parent_hwirq:
77 * This callback translates a child hardware IRQ offset to a parent
78 * hardware IRQ offset on a hierarchical interrupt chip. The child
79 * hardware IRQs correspond to the GPIO index 0..ngpio-1 (see the
80 * ngpio field of struct gpio_chip) and the corresponding parent
81 * hardware IRQ and type (such as IRQ_TYPE_*) shall be returned by
82 * the driver. The driver can calculate this from an offset or using
83 * a lookup table or whatever method is best for this chip. Return
84 * 0 on successful translation in the driver.
86 * If some ranges of hardware IRQs do not have a corresponding parent
87 * HWIRQ, return -EINVAL, but also make sure to fill in @valid_mask and
88 * @need_valid_mask to make these GPIO lines unavailable for
91 int (*child_to_parent_hwirq)(struct gpio_chip *gc,
92 unsigned int child_hwirq,
93 unsigned int child_type,
94 unsigned int *parent_hwirq,
95 unsigned int *parent_type);
98 * @populate_parent_alloc_arg :
100 * This optional callback allocates and populates the specific struct
101 * for the parent's IRQ domain. If this is not specified, then
102 * &gpiochip_populate_parent_fwspec_twocell will be used. A four-cell
103 * variant named &gpiochip_populate_parent_fwspec_fourcell is also
106 void *(*populate_parent_alloc_arg)(struct gpio_chip *gc,
107 unsigned int parent_hwirq,
108 unsigned int parent_type);
111 * @child_offset_to_irq:
113 * This optional callback is used to translate the child's GPIO line
114 * offset on the GPIO chip to an IRQ number for the GPIO to_irq()
115 * callback. If this is not specified, then a default callback will be
116 * provided that returns the line offset.
118 unsigned int (*child_offset_to_irq)(struct gpio_chip *gc,
122 * @child_irq_domain_ops:
124 * The IRQ domain operations that will be used for this GPIO IRQ
125 * chip. If no operations are provided, then default callbacks will
126 * be populated to setup the IRQ hierarchy. Some drivers need to
127 * supply their own translate function.
129 struct irq_domain_ops child_irq_domain_ops;
135 * The IRQ handler to use (often a predefined IRQ core function) for
136 * GPIO IRQs, provided by GPIO driver.
138 irq_flow_handler_t handler;
143 * Default IRQ triggering type applied during GPIO driver
144 * initialization, provided by GPIO driver.
146 unsigned int default_type;
151 * Per GPIO IRQ chip lockdep class for IRQ lock.
153 struct lock_class_key *lock_key;
158 * Per GPIO IRQ chip lockdep class for IRQ request.
160 struct lock_class_key *request_key;
165 * The interrupt handler for the GPIO chip's parent interrupts, may be
166 * NULL if the parent interrupts are nested rather than cascaded.
168 irq_flow_handler_t parent_handler;
171 * @parent_handler_data:
173 * If @per_parent_data is false, @parent_handler_data is a single
174 * pointer used as the data associated with every parent interrupt.
176 * @parent_handler_data_array:
178 * If @per_parent_data is true, @parent_handler_data_array is
179 * an array of @num_parents pointers, and is used to associate
180 * different data for each parent. This cannot be NULL if
181 * @per_parent_data is true.
184 void *parent_handler_data;
185 void **parent_handler_data_array;
191 * The number of interrupt parents of a GPIO chip.
193 unsigned int num_parents;
198 * A list of interrupt parents of a GPIO chip. This is owned by the
199 * driver, so the core will only reference this list, not modify it.
201 unsigned int *parents;
206 * A list of interrupt parents for each line of a GPIO chip.
213 * True if set the interrupt handling uses nested threads.
220 * True if parent_handler_data_array describes a @num_parents
221 * sized array to be used as parent data.
223 bool per_parent_data;
228 * Flag to track GPIO chip irq member's initialization.
229 * This flag will make sure GPIO chip irq members are not used
230 * before they are initialized.
235 * @init_hw: optional routine to initialize hardware before
236 * an IRQ chip will be added. This is quite useful when
237 * a particular driver wants to clear IRQ related registers
238 * in order to avoid undesired events.
240 int (*init_hw)(struct gpio_chip *gc);
243 * @init_valid_mask: optional routine to initialize @valid_mask, to be
244 * used if not all GPIO lines are valid interrupts. Sometimes some
245 * lines just cannot fire interrupts, and this routine, when defined,
246 * is passed a bitmap in "valid_mask" and it will have ngpios
247 * bits from 0..(ngpios-1) set to "1" as in valid. The callback can
248 * then directly set some bits to "0" if they cannot be used for
251 void (*init_valid_mask)(struct gpio_chip *gc,
252 unsigned long *valid_mask,
253 unsigned int ngpios);
258 * If not %NULL, holds bitmask of GPIOs which are valid to be included
259 * in IRQ domain of the chip.
261 unsigned long *valid_mask;
266 * Required for static IRQ allocation. If set, irq_domain_add_simple()
267 * will allocate and map all IRQs during initialization.
274 * Store old irq_chip irq_enable callback
276 void (*irq_enable)(struct irq_data *data);
281 * Store old irq_chip irq_disable callback
283 void (*irq_disable)(struct irq_data *data);
287 * Store old irq_chip irq_unmask callback
289 void (*irq_unmask)(struct irq_data *data);
294 * Store old irq_chip irq_mask callback
296 void (*irq_mask)(struct irq_data *data);
300 * struct gpio_chip - abstract a GPIO controller
301 * @label: a functional name for the GPIO device, such as a part
302 * number or the name of the SoC IP-block implementing it.
303 * @gpiodev: the internal state holder, opaque struct
304 * @parent: optional parent device providing the GPIOs
305 * @fwnode: optional fwnode providing this controller's properties
306 * @owner: helps prevent removal of modules exporting active GPIOs
307 * @request: optional hook for chip-specific activation, such as
308 * enabling module power and clock; may sleep
309 * @free: optional hook for chip-specific deactivation, such as
310 * disabling module power and clock; may sleep
311 * @get_direction: returns direction for signal "offset", 0=out, 1=in,
312 * (same as GPIO_LINE_DIRECTION_OUT / GPIO_LINE_DIRECTION_IN),
313 * or negative error. It is recommended to always implement this
314 * function, even on input-only or output-only gpio chips.
315 * @direction_input: configures signal "offset" as input, or returns error
316 * This can be omitted on input-only or output-only gpio chips.
317 * @direction_output: configures signal "offset" as output, or returns error
318 * This can be omitted on input-only or output-only gpio chips.
319 * @get: returns value for signal "offset", 0=low, 1=high, or negative error
320 * @get_multiple: reads values for multiple signals defined by "mask" and
321 * stores them in "bits", returns 0 on success or negative error
322 * @set: assigns output value for signal "offset"
323 * @set_multiple: assigns output values for multiple signals defined by "mask"
324 * @set_config: optional hook for all kinds of settings. Uses the same
325 * packed config format as generic pinconf.
326 * @to_irq: optional hook supporting non-static gpio_to_irq() mappings;
327 * implementation may not sleep
328 * @dbg_show: optional routine to show contents in debugfs; default code
329 * will be used when this is omitted, but custom code can show extra
330 * state (such as pullup/pulldown configuration).
331 * @init_valid_mask: optional routine to initialize @valid_mask, to be used if
332 * not all GPIOs are valid.
333 * @add_pin_ranges: optional routine to initialize pin ranges, to be used when
334 * requires special mapping of the pins that provides GPIO functionality.
335 * It is called after adding GPIO chip and before adding IRQ chip.
336 * @base: identifies the first GPIO number handled by this chip;
337 * or, if negative during registration, requests dynamic ID allocation.
338 * DEPRECATION: providing anything non-negative and nailing the base
339 * offset of GPIO chips is deprecated. Please pass -1 as base to
340 * let gpiolib select the chip base in all possible cases. We want to
341 * get rid of the static GPIO number space in the long run.
342 * @ngpio: the number of GPIOs handled by this controller; the last GPIO
343 * handled is (base + ngpio - 1).
344 * @offset: when multiple gpio chips belong to the same device this
345 * can be used as offset within the device so friendly names can
346 * be properly assigned.
347 * @names: if set, must be an array of strings to use as alternative
348 * names for the GPIOs in this chip. Any entry in the array
349 * may be NULL if there is no alias for the GPIO, however the
350 * array must be @ngpio entries long. A name can include a single printk
351 * format specifier for an unsigned int. It is substituted by the actual
352 * number of the gpio.
353 * @can_sleep: flag must be set iff get()/set() methods sleep, as they
354 * must while accessing GPIO expander chips over I2C or SPI. This
355 * implies that if the chip supports IRQs, these IRQs need to be threaded
356 * as the chip access may sleep when e.g. reading out the IRQ status
358 * @read_reg: reader function for generic GPIO
359 * @write_reg: writer function for generic GPIO
360 * @be_bits: if the generic GPIO has big endian bit order (bit 31 is representing
361 * line 0, bit 30 is line 1 ... bit 0 is line 31) this is set to true by the
362 * generic GPIO core. It is for internal housekeeping only.
363 * @reg_dat: data (in) register for generic GPIO
364 * @reg_set: output set register (out=high) for generic GPIO
365 * @reg_clr: output clear register (out=low) for generic GPIO
366 * @reg_dir_out: direction out setting register for generic GPIO
367 * @reg_dir_in: direction in setting register for generic GPIO
368 * @bgpio_dir_unreadable: indicates that the direction register(s) cannot
369 * be read and we need to rely on out internal state tracking.
370 * @bgpio_bits: number of register bits used for a generic GPIO i.e.
371 * <register width> * 8
372 * @bgpio_lock: used to lock chip->bgpio_data. Also, this is needed to keep
373 * shadowed and real data registers writes together.
374 * @bgpio_data: shadowed data register for generic GPIO to clear/set bits
376 * @bgpio_dir: shadowed direction register for generic GPIO to clear/set
377 * direction safely. A "1" in this word means the line is set as
380 * A gpio_chip can help platforms abstract various sources of GPIOs so
381 * they can all be accessed through a common programming interface.
382 * Example sources would be SOC controllers, FPGAs, multifunction
383 * chips, dedicated GPIO expanders, and so on.
385 * Each chip controls a number of signals, identified in method calls
386 * by "offset" values in the range 0..(@ngpio - 1). When those signals
387 * are referenced through calls like gpio_get_value(gpio), the offset
388 * is calculated by subtracting @base from the gpio number.
392 struct gpio_device *gpiodev;
393 struct device *parent;
394 struct fwnode_handle *fwnode;
395 struct module *owner;
397 int (*request)(struct gpio_chip *gc,
398 unsigned int offset);
399 void (*free)(struct gpio_chip *gc,
400 unsigned int offset);
401 int (*get_direction)(struct gpio_chip *gc,
402 unsigned int offset);
403 int (*direction_input)(struct gpio_chip *gc,
404 unsigned int offset);
405 int (*direction_output)(struct gpio_chip *gc,
406 unsigned int offset, int value);
407 int (*get)(struct gpio_chip *gc,
408 unsigned int offset);
409 int (*get_multiple)(struct gpio_chip *gc,
411 unsigned long *bits);
412 void (*set)(struct gpio_chip *gc,
413 unsigned int offset, int value);
414 void (*set_multiple)(struct gpio_chip *gc,
416 unsigned long *bits);
417 int (*set_config)(struct gpio_chip *gc,
419 unsigned long config);
420 int (*to_irq)(struct gpio_chip *gc,
421 unsigned int offset);
423 void (*dbg_show)(struct seq_file *s,
424 struct gpio_chip *gc);
426 int (*init_valid_mask)(struct gpio_chip *gc,
427 unsigned long *valid_mask,
428 unsigned int ngpios);
430 int (*add_pin_ranges)(struct gpio_chip *gc);
435 const char *const *names;
438 #if IS_ENABLED(CONFIG_GPIO_GENERIC)
439 unsigned long (*read_reg)(void __iomem *reg);
440 void (*write_reg)(void __iomem *reg, unsigned long data);
442 void __iomem *reg_dat;
443 void __iomem *reg_set;
444 void __iomem *reg_clr;
445 void __iomem *reg_dir_out;
446 void __iomem *reg_dir_in;
447 bool bgpio_dir_unreadable;
449 raw_spinlock_t bgpio_lock;
450 unsigned long bgpio_data;
451 unsigned long bgpio_dir;
452 #endif /* CONFIG_GPIO_GENERIC */
454 #ifdef CONFIG_GPIOLIB_IRQCHIP
456 * With CONFIG_GPIOLIB_IRQCHIP we get an irqchip inside the gpiolib
457 * to handle IRQs for most practical cases.
463 * Integrates interrupt chip functionality with the GPIO chip. Can be
464 * used to handle IRQs for most practical cases.
466 struct gpio_irq_chip irq;
467 #endif /* CONFIG_GPIOLIB_IRQCHIP */
472 * If not %NULL, holds bitmask of GPIOs which are valid to be used
475 unsigned long *valid_mask;
477 #if defined(CONFIG_OF_GPIO)
479 * If CONFIG_OF_GPIO is enabled, then all GPIO controllers described in
480 * the device tree automatically may have an OF translation
486 * Pointer to a device tree node representing this GPIO controller.
488 struct device_node *of_node;
493 * Number of cells used to form the GPIO specifier.
495 unsigned int of_gpio_n_cells;
500 * Callback to translate a device tree GPIO specifier into a chip-
501 * relative GPIO number and flags.
503 int (*of_xlate)(struct gpio_chip *gc,
504 const struct of_phandle_args *gpiospec, u32 *flags);
505 #endif /* CONFIG_OF_GPIO */
508 extern const char *gpiochip_is_requested(struct gpio_chip *gc,
509 unsigned int offset);
512 * for_each_requested_gpio_in_range - iterates over requested GPIOs in a given range
513 * @chip: the chip to query
515 * @base: first GPIO in the range
516 * @size: amount of GPIOs to check starting from @base
517 * @label: label of current GPIO
519 #define for_each_requested_gpio_in_range(chip, i, base, size, label) \
520 for (i = 0; i < size; i++) \
521 if ((label = gpiochip_is_requested(chip, base + i)) == NULL) {} else
523 /* Iterates over all requested GPIO of the given @chip */
524 #define for_each_requested_gpio(chip, i, label) \
525 for_each_requested_gpio_in_range(chip, i, 0, chip->ngpio, label)
527 /* add/remove chips */
528 extern int gpiochip_add_data_with_key(struct gpio_chip *gc, void *data,
529 struct lock_class_key *lock_key,
530 struct lock_class_key *request_key);
533 * gpiochip_add_data() - register a gpio_chip
534 * @gc: the chip to register, with gc->base initialized
535 * @data: driver-private data associated with this chip
537 * Context: potentially before irqs will work
539 * When gpiochip_add_data() is called very early during boot, so that GPIOs
540 * can be freely used, the gc->parent device must be registered before
541 * the gpio framework's arch_initcall(). Otherwise sysfs initialization
542 * for GPIOs will fail rudely.
544 * gpiochip_add_data() must only be called after gpiolib initialization,
545 * i.e. after core_initcall().
547 * If gc->base is negative, this requests dynamic assignment of
548 * a range of valid GPIOs.
551 * A negative errno if the chip can't be registered, such as because the
552 * gc->base is invalid or already associated with a different chip.
553 * Otherwise it returns zero as a success code.
555 #ifdef CONFIG_LOCKDEP
556 #define gpiochip_add_data(gc, data) ({ \
557 static struct lock_class_key lock_key; \
558 static struct lock_class_key request_key; \
559 gpiochip_add_data_with_key(gc, data, &lock_key, \
562 #define devm_gpiochip_add_data(dev, gc, data) ({ \
563 static struct lock_class_key lock_key; \
564 static struct lock_class_key request_key; \
565 devm_gpiochip_add_data_with_key(dev, gc, data, &lock_key, \
569 #define gpiochip_add_data(gc, data) gpiochip_add_data_with_key(gc, data, NULL, NULL)
570 #define devm_gpiochip_add_data(dev, gc, data) \
571 devm_gpiochip_add_data_with_key(dev, gc, data, NULL, NULL)
572 #endif /* CONFIG_LOCKDEP */
574 static inline int gpiochip_add(struct gpio_chip *gc)
576 return gpiochip_add_data(gc, NULL);
578 extern void gpiochip_remove(struct gpio_chip *gc);
579 extern int devm_gpiochip_add_data_with_key(struct device *dev, struct gpio_chip *gc, void *data,
580 struct lock_class_key *lock_key,
581 struct lock_class_key *request_key);
583 extern struct gpio_chip *gpiochip_find(void *data,
584 int (*match)(struct gpio_chip *gc, void *data));
586 bool gpiochip_line_is_irq(struct gpio_chip *gc, unsigned int offset);
587 int gpiochip_reqres_irq(struct gpio_chip *gc, unsigned int offset);
588 void gpiochip_relres_irq(struct gpio_chip *gc, unsigned int offset);
589 void gpiochip_disable_irq(struct gpio_chip *gc, unsigned int offset);
590 void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset);
592 /* irq_data versions of the above */
593 int gpiochip_irq_reqres(struct irq_data *data);
594 void gpiochip_irq_relres(struct irq_data *data);
596 /* Paste this in your irq_chip structure */
597 #define GPIOCHIP_IRQ_RESOURCE_HELPERS \
598 .irq_request_resources = gpiochip_irq_reqres, \
599 .irq_release_resources = gpiochip_irq_relres
601 static inline void gpio_irq_chip_set_chip(struct gpio_irq_chip *girq,
602 const struct irq_chip *chip)
604 /* Yes, dropping const is ugly, but it isn't like we have a choice */
605 girq->chip = (struct irq_chip *)chip;
608 /* Line status inquiry for drivers */
609 bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset);
610 bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);
612 /* Sleep persistence inquiry for drivers */
613 bool gpiochip_line_is_persistent(struct gpio_chip *gc, unsigned int offset);
614 bool gpiochip_line_is_valid(const struct gpio_chip *gc, unsigned int offset);
616 /* get driver data */
617 void *gpiochip_get_data(struct gpio_chip *gc);
625 #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
627 void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc,
628 unsigned int parent_hwirq,
629 unsigned int parent_type);
630 void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
631 unsigned int parent_hwirq,
632 unsigned int parent_type);
636 static inline void *gpiochip_populate_parent_fwspec_twocell(struct gpio_chip *gc,
637 unsigned int parent_hwirq,
638 unsigned int parent_type)
643 static inline void *gpiochip_populate_parent_fwspec_fourcell(struct gpio_chip *gc,
644 unsigned int parent_hwirq,
645 unsigned int parent_type)
650 #endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
652 int bgpio_init(struct gpio_chip *gc, struct device *dev,
653 unsigned long sz, void __iomem *dat, void __iomem *set,
654 void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
655 unsigned long flags);
657 #define BGPIOF_BIG_ENDIAN BIT(0)
658 #define BGPIOF_UNREADABLE_REG_SET BIT(1) /* reg_set is unreadable */
659 #define BGPIOF_UNREADABLE_REG_DIR BIT(2) /* reg_dir is unreadable */
660 #define BGPIOF_BIG_ENDIAN_BYTE_ORDER BIT(3)
661 #define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */
662 #define BGPIOF_NO_OUTPUT BIT(5) /* only input */
663 #define BGPIOF_NO_SET_ON_INPUT BIT(6)
665 int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
666 irq_hw_number_t hwirq);
667 void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq);
669 int gpiochip_irq_domain_activate(struct irq_domain *domain,
670 struct irq_data *data, bool reserve);
671 void gpiochip_irq_domain_deactivate(struct irq_domain *domain,
672 struct irq_data *data);
674 bool gpiochip_irqchip_irq_valid(const struct gpio_chip *gc,
675 unsigned int offset);
677 #ifdef CONFIG_GPIOLIB_IRQCHIP
678 int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
679 struct irq_domain *domain);
681 static inline int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
682 struct irq_domain *domain)
689 int gpiochip_generic_request(struct gpio_chip *gc, unsigned int offset);
690 void gpiochip_generic_free(struct gpio_chip *gc, unsigned int offset);
691 int gpiochip_generic_config(struct gpio_chip *gc, unsigned int offset,
692 unsigned long config);
695 * struct gpio_pin_range - pin range controlled by a gpio chip
696 * @node: list for maintaining set of pin ranges, used internally
697 * @pctldev: pinctrl device which handles corresponding pins
698 * @range: actual range of pins controlled by a gpio controller
700 struct gpio_pin_range {
701 struct list_head node;
702 struct pinctrl_dev *pctldev;
703 struct pinctrl_gpio_range range;
706 #ifdef CONFIG_PINCTRL
708 int gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
709 unsigned int gpio_offset, unsigned int pin_offset,
711 int gpiochip_add_pingroup_range(struct gpio_chip *gc,
712 struct pinctrl_dev *pctldev,
713 unsigned int gpio_offset, const char *pin_group);
714 void gpiochip_remove_pin_ranges(struct gpio_chip *gc);
716 #else /* ! CONFIG_PINCTRL */
719 gpiochip_add_pin_range(struct gpio_chip *gc, const char *pinctl_name,
720 unsigned int gpio_offset, unsigned int pin_offset,
726 gpiochip_add_pingroup_range(struct gpio_chip *gc,
727 struct pinctrl_dev *pctldev,
728 unsigned int gpio_offset, const char *pin_group)
734 gpiochip_remove_pin_ranges(struct gpio_chip *gc)
738 #endif /* CONFIG_PINCTRL */
740 struct gpio_desc *gpiochip_request_own_desc(struct gpio_chip *gc,
743 enum gpio_lookup_flags lflags,
744 enum gpiod_flags dflags);
745 void gpiochip_free_own_desc(struct gpio_desc *desc);
747 #ifdef CONFIG_GPIOLIB
749 /* lock/unlock as IRQ */
750 int gpiochip_lock_as_irq(struct gpio_chip *gc, unsigned int offset);
751 void gpiochip_unlock_as_irq(struct gpio_chip *gc, unsigned int offset);
754 struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
756 #else /* CONFIG_GPIOLIB */
758 static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
760 /* GPIO can never have been requested */
762 return ERR_PTR(-ENODEV);
765 static inline int gpiochip_lock_as_irq(struct gpio_chip *gc,
772 static inline void gpiochip_unlock_as_irq(struct gpio_chip *gc,
777 #endif /* CONFIG_GPIOLIB */
779 #define for_each_gpiochip_node(dev, child) \
780 device_for_each_child_node(dev, child) \
781 if (!fwnode_property_present(child, "gpio-controller")) {} else
783 static inline unsigned int gpiochip_node_count(struct device *dev)
785 struct fwnode_handle *child;
786 unsigned int count = 0;
788 for_each_gpiochip_node(dev, child)
794 static inline struct fwnode_handle *gpiochip_node_get_first(struct device *dev)
796 struct fwnode_handle *fwnode;
798 for_each_gpiochip_node(dev, fwnode)
804 #endif /* __LINUX_GPIO_DRIVER_H */