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authorAlexandre Courbot <acourbot@nvidia.com>2013-02-02 18:44:06 +0400
committerLinus Walleij <linus.walleij@linaro.org>2013-02-05 00:41:46 +0400
commit710b40eac4d91bd08f07f289cf6d6f3861c87187 (patch)
treefdd5afda03ff86731faeb100ae9e5a7d55b767c7
parent6320c7b7990e1e759a18666b6c616aae9bd3b12d (diff)
downloadlinux-710b40eac4d91bd08f07f289cf6d6f3861c87187.tar.xz
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>
-rw-r--r--drivers/gpio/gpiolib.c58
-rw-r--r--include/asm-generic/gpio.h1
2 files changed, 8 insertions, 51 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 199fca15f270..e27877ad0163 100644
--- 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 45b8916805f3..2034e691c7ab 100644
--- 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);