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gpio: remove less important #ifdef around declarations 

The whole struct/function declarations in this header are surrounded
by #ifdef.

As far as I understood, the motivation of this is probably to break
the build earlier if a driver misses to select or depend on correct
CONFIG options in Kconfig.

Since commit 94bed2a9c4 ("Add -Werror-implicit-function-declaration")
no one cannot call functions that have not been declared.

So, I see some benefit in doing this in the cost of uglier headers.

In reality, it would not be so easy to catch missed 'select' or
'depends on' because GPIOLIB, GPIOLIB_IRQCHIP etc. are already selected
by someone else eventually. So, this kind of error, if any, will be
caught by randconfig bots.

In summary, I am not a big fan of cluttered #ifdef nesting, and this
does not matter for normal developers. The code readability wins.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Masahiro Yamada 2019-07-30 14:43:47 +09:00 committed by Bartosz Golaszewski
parent 66ad66293e
commit 9091373ab7
1 changed files with 8 additions and 19 deletions
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27
include/linux/gpio/driver.h
View File

@ -20,9 +20,6 @@ struct module;
enum gpiod_flags;
enum gpio_lookup_flags;
#ifdef CONFIG_GPIOLIB
#ifdef CONFIG_GPIOLIB_IRQCHIP
/**
* struct gpio_irq_chip - GPIO interrupt controller
*/
@ -161,7 +158,6 @@ struct gpio_irq_chip {
*/
void (*irq_disable)(struct irq_data *data);
};
#endif /* CONFIG_GPIOLIB_IRQCHIP */
/**
* struct gpio_chip - abstract a GPIO controller
@ -441,16 +437,12 @@ bool gpiochip_line_is_valid(const struct gpio_chip *chip, unsigned int offset);
/* get driver data */
void *gpiochip_get_data(struct gpio_chip *chip);
struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
struct bgpio_pdata {
const char *label;
int base;
int ngpio;
};
#if IS_ENABLED(CONFIG_GPIO_GENERIC)
int bgpio_init(struct gpio_chip *gc, struct device *dev,
unsigned long sz, void __iomem *dat, void __iomem *set,
void __iomem *clr, void __iomem *dirout, void __iomem *dirin,
@ -463,10 +455,6 @@ int bgpio_init(struct gpio_chip *gc, struct device *dev,
#define BGPIOF_READ_OUTPUT_REG_SET BIT(4) /* reg_set stores output value */
#define BGPIOF_NO_OUTPUT BIT(5) /* only input */
#endif /* CONFIG_GPIO_GENERIC */
#ifdef CONFIG_GPIOLIB_IRQCHIP
int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq);
void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq);
@ -555,15 +543,11 @@ static inline int gpiochip_irqchip_add_nested(struct gpio_chip *gpiochip,
}
#endif /* CONFIG_LOCKDEP */
#endif /* CONFIG_GPIOLIB_IRQCHIP */
int gpiochip_generic_request(struct gpio_chip *chip, unsigned offset);
void gpiochip_generic_free(struct gpio_chip *chip, unsigned offset);
int gpiochip_generic_config(struct gpio_chip *chip, unsigned offset,
unsigned long config);
#ifdef CONFIG_PINCTRL
/**
* struct gpio_pin_range - pin range controlled by a gpio chip
* @node: list for maintaining set of pin ranges, used internally
@ -576,6 +560,8 @@ struct gpio_pin_range {
struct pinctrl_gpio_range range;
};
#ifdef CONFIG_PINCTRL
int gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
unsigned int gpio_offset, unsigned int pin_offset,
unsigned int npins);
@ -586,8 +572,6 @@ void gpiochip_remove_pin_ranges(struct gpio_chip *chip);
#else /* ! CONFIG_PINCTRL */
struct pinctrl_dev;
static inline int
gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,
unsigned int gpio_offset, unsigned int pin_offset,
@ -619,6 +603,11 @@ void gpiochip_free_own_desc(struct gpio_desc *desc);
void devprop_gpiochip_set_names(struct gpio_chip *chip,
const struct fwnode_handle *fwnode);
#ifdef CONFIG_GPIOLIB
struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc);
#else /* CONFIG_GPIOLIB */
static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
@ -630,4 +619,4 @@ static inline struct gpio_chip *gpiod_to_chip(const struct gpio_desc *desc)
#endif /* CONFIG_GPIOLIB */
#endif
#endif /* __LINUX_GPIO_DRIVER_H */