gpiolib: remove gpiochip_reserve()

gpiochip_reserve() has no user and stands in the way of the removal of
the static gpio_desc[] array. Remove this function as well as the now
unneeded RESERVED flag of struct gpio_desc.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 199fca1..e27877a 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -52,14 +52,13 @@ struct gpio_desc {
 /* flag symbols are bit numbers */
 #define FLAG_REQUESTED 0
 #define FLAG_IS_OUT    1
-#define FLAG_RESERVED  2
-#define FLAG_EXPORT    3       /* protected by sysfs_lock */
-#define FLAG_SYSFS     4       /* exported via /sys/class/gpio/control */
-#define FLAG_TRIG_FALL 5       /* trigger on falling edge */
-#define FLAG_TRIG_RISE 6       /* trigger on rising edge */
-#define FLAG_ACTIVE_LOW        7       /* sysfs value has active low */
-#define FLAG_OPEN_DRAIN        8       /* Gpio is open drain type */
-#define FLAG_OPEN_SOURCE 9     /* Gpio is open source type */
+#define FLAG_EXPORT    2       /* protected by sysfs_lock */
+#define FLAG_SYSFS     3       /* exported via /sys/class/gpio/control */
+#define FLAG_TRIG_FALL 4       /* trigger on falling edge */
+#define FLAG_TRIG_RISE 5       /* trigger on rising edge */
+#define FLAG_ACTIVE_LOW        6       /* sysfs value has active low */
+#define FLAG_OPEN_DRAIN        7       /* Gpio is open drain type */
+#define FLAG_OPEN_SOURCE 8     /* Gpio is open source type */
 
 #define ID_SHIFT       16      /* add new flags before this one */
 
@@ -132,7 +131,7 @@ static int gpiochip_find_base(int ngpio)
                struct gpio_desc *desc = &gpio_desc[i];
                struct gpio_chip *chip = desc->chip;
 
-               if (!chip && !test_bit(FLAG_RESERVED, &desc->flags)) {
+               if (!chip) {
                        spare++;
                        if (spare == ngpio) {
                                base = i;
@@ -150,47 +149,6 @@ static int gpiochip_find_base(int ngpio)
        return base;
 }
 
-/**
- * gpiochip_reserve() - reserve range of gpios to use with platform code only
- * @start: starting gpio number
- * @ngpio: number of gpios to reserve
- * Context: platform init, potentially before irqs or kmalloc will work
- *
- * Returns a negative errno if any gpio within the range is already reserved
- * or registered, else returns zero as a success code.  Use this function
- * to mark a range of gpios as unavailable for dynamic gpio number allocation,
- * for example because its driver support is not yet loaded.
- */
-int __init gpiochip_reserve(int start, int ngpio)
-{
-       int ret = 0;
-       unsigned long flags;
-       int i;
-
-       if (!gpio_is_valid(start) || !gpio_is_valid(start + ngpio - 1))
-               return -EINVAL;
-
-       spin_lock_irqsave(&gpio_lock, flags);
-
-       for (i = start; i < start + ngpio; i++) {
-               struct gpio_desc *desc = &gpio_desc[i];
-
-               if (desc->chip || test_bit(FLAG_RESERVED, &desc->flags)) {
-                       ret = -EBUSY;
-                       goto err;
-               }
-
-               set_bit(FLAG_RESERVED, &desc->flags);
-       }
-
-       pr_debug("%s: reserved gpios from %d to %d\n",
-                __func__, start, start + ngpio - 1);
-err:
-       spin_unlock_irqrestore(&gpio_lock, flags);
-
-       return ret;
-}
-
 /* caller ensures gpio is valid and requested, chip->get_direction may sleep  */
 static int gpio_get_direction(unsigned gpio)
 {

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 45b8916..2034e69 100644 (file)
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -152,7 +152,6 @@ struct gpio_chip {
 extern const char *gpiochip_is_requested(struct gpio_chip *chip,
                        unsigned offset);
 extern struct gpio_chip *gpio_to_chip(unsigned gpio);
-extern int __must_check gpiochip_reserve(int start, int ngpio);
 
 /* add/remove chips */
 extern int gpiochip_add(struct gpio_chip *chip);