gpio: Add comments on #if/#else/#endif

Improve readability a bit by commenting #if/#else/#endif statements
with the checked preprocessor symbols.

Signed-off-by: Enrico Weigelt <info@metux.net>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 02698c0..5d325fd 100644 (file)
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -161,7 +161,7 @@ struct gpio_irq_chip {
         */
        void            (*irq_disable)(struct irq_data *data);
 };
-#endif
+#endif /* CONFIG_GPIOLIB_IRQCHIP */
 
 /**
  * struct gpio_chip - abstract a GPIO controller
@@ -301,7 +301,7 @@ struct gpio_chip {
        spinlock_t bgpio_lock;
        unsigned long bgpio_data;
        unsigned long bgpio_dir;
-#endif
+#endif /* CONFIG_GPIO_GENERIC */
 
 #ifdef CONFIG_GPIOLIB_IRQCHIP
        /*
@@ -316,7 +316,7 @@ struct gpio_chip {
         * used to handle IRQs for most practical cases.
         */
        struct gpio_irq_chip irq;
-#endif
+#endif /* CONFIG_GPIOLIB_IRQCHIP */
 
        /**
         * @need_valid_mask:
@@ -363,7 +363,7 @@ struct gpio_chip {
         */
        int (*of_xlate)(struct gpio_chip *gc,
                        const struct of_phandle_args *gpiospec, u32 *flags);
-#endif
+#endif /* CONFIG_OF_GPIO */
 };
 
 extern const char *gpiochip_is_requested(struct gpio_chip *chip,
@@ -406,7 +406,7 @@ extern int gpiochip_add_data_with_key(struct gpio_chip *chip, void *data,
        })
 #else
 #define gpiochip_add_data(chip, data) gpiochip_add_data_with_key(chip, data, NULL, NULL)
-#endif
+#endif /* CONFIG_LOCKDEP */
 
 static inline int gpiochip_add(struct gpio_chip *chip)
 {
@@ -461,7 +461,7 @@ 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
+#endif /* CONFIG_GPIO_GENERIC */
 
 #ifdef CONFIG_GPIOLIB_IRQCHIP
 
@@ -531,7 +531,7 @@ static inline int gpiochip_irqchip_add_nested(struct gpio_chip *gpiochip,
                                        handler, type, true,
                                        &lock_key, &request_key);
 }
-#else
+#else /* ! CONFIG_LOCKDEP */
 static inline int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
                                       struct irq_chip *irqchip,
                                       unsigned int first_irq,
@@ -582,7 +582,7 @@ int gpiochip_add_pingroup_range(struct gpio_chip *chip,
                        unsigned int gpio_offset, const char *pin_group);
 void gpiochip_remove_pin_ranges(struct gpio_chip *chip);
 
-#else
+#else /* ! CONFIG_PINCTRL */
 
 static inline int
 gpiochip_add_pin_range(struct gpio_chip *chip, const char *pinctl_name,

diff --git a/include/linux/gpio/gpio-reg.h b/include/linux/gpio/gpio-reg.h
index 5c6efd3..39b888c 100644 (file)
--- a/include/linux/gpio/gpio-reg.h
+++ b/include/linux/gpio/gpio-reg.h
@@ -11,4 +11,4 @@ struct gpio_chip *gpio_reg_init(struct device *dev, void __iomem *reg,
 
 int gpio_reg_resume(struct gpio_chip *gc);
 
-#endif
+#endif /* GPIO_REG_H */

diff --git a/include/linux/gpio/machine.h b/include/linux/gpio/machine.h
index 35f299d..1ebe5be 100644 (file)
--- a/include/linux/gpio/machine.h
+++ b/include/linux/gpio/machine.h
@@ -97,7 +97,7 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table);
 void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n);
 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table);
 void gpiod_add_hogs(struct gpiod_hog *hogs);
-#else
+#else /* ! CONFIG_GPIOLIB */
 static inline
 void gpiod_add_lookup_table(struct gpiod_lookup_table *table) {}
 static inline
@@ -105,6 +105,6 @@ void gpiod_add_lookup_tables(struct gpiod_lookup_table **tables, size_t n) {}
 static inline
 void gpiod_remove_lookup_table(struct gpiod_lookup_table *table) {}
 static inline void gpiod_add_hogs(struct gpiod_hog *hogs) {}
-#endif
+#endif /* CONFIG_GPIOLIB */
 
 #endif /* __LINUX_GPIO_MACHINE_H */