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gpio/powerpc: Eliminate duplication of of_get_named_gpio_flags()

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A large chunk of qe_pin_request() is unnecessarily cut-and-paste
directly from of_get_named_gpio_flags().  This patch cuts out the
duplicate code and replaces it with a call to of_get_gpio().

v2: fixed compile error due to missing gpio_to_chip()

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Grant Likely 2011-12-12 09:25:57 -07:00
parent fe9f68449a
commit 1a2d397a6e
3 changed files with 10 additions and 35 deletions
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42
arch/powerpc/sysdev/qe_lib/gpio.c
View file

@ -139,14 +139,10 @@ struct qe_pin {
struct qe_pin *qe_pin_request(struct device_node *np, int index)
{
struct qe_pin *qe_pin;
struct device_node *gpio_np;
struct gpio_chip *gc;
struct of_mm_gpio_chip *mm_gc;
struct qe_gpio_chip *qe_gc;
int err;
int size;
const void *gpio_spec;
const u32 *gpio_cells;
unsigned long flags;
qe_pin = kzalloc(sizeof(*qe_pin), GFP_KERNEL);
@ -155,45 +151,25 @@ struct qe_pin *qe_pin_request(struct device_node *np, int index)
return ERR_PTR(-ENOMEM);
}
err = of_parse_phandles_with_args(np, "gpios", "#gpio-cells", index,
&gpio_np, &gpio_spec);
if (err) {
pr_debug("%s: can't parse gpios property\n", __func__);
err = of_get_gpio(np, index);
if (err < 0)
goto err0;
gc = gpio_to_chip(err);
if (WARN_ON(!gc))
goto err0;
}
if (!of_device_is_compatible(gpio_np, "fsl,mpc8323-qe-pario-bank")) {
if (!of_device_is_compatible(gc->of_node, "fsl,mpc8323-qe-pario-bank")) {
pr_debug("%s: tried to get a non-qe pin\n", __func__);
err = -EINVAL;
goto err1;
goto err0;
}
gc = of_node_to_gpiochip(gpio_np);
if (!gc) {
pr_debug("%s: gpio controller %s isn't registered\n",
np->full_name, gpio_np->full_name);
err = -ENODEV;
goto err1;
}
gpio_cells = of_get_property(gpio_np, "#gpio-cells", &size);
if (!gpio_cells || size != sizeof(*gpio_cells) ||
*gpio_cells != gc->of_gpio_n_cells) {
pr_debug("%s: wrong #gpio-cells for %s\n",
np->full_name, gpio_np->full_name);
err = -EINVAL;
goto err1;
}
err = gc->of_xlate(gc, np, gpio_spec, NULL);
if (err < 0)
goto err1;
mm_gc = to_of_mm_gpio_chip(gc);
qe_gc = to_qe_gpio_chip(mm_gc);
spin_lock_irqsave(&qe_gc->lock, flags);
err -= gc->base;
if (test_and_set_bit(QE_PIN_REQUESTED, &qe_gc->pin_flags[err]) == 0) {
qe_pin->controller = qe_gc;
qe_pin->num = err;
@ -206,8 +182,6 @@ struct qe_pin *qe_pin_request(struct device_node *np, int index)
if (!err)
return qe_pin;
err1:
of_node_put(gpio_np);
err0:
kfree(qe_pin);
pr_debug("%s failed with status %d\n", __func__, err);

2
drivers/gpio/gpiolib.c
View file

@ -114,7 +114,7 @@ static int gpio_ensure_requested(struct gpio_desc *desc, unsigned offset)
}
/* caller holds gpio_lock *OR* gpio is marked as requested */
static inline struct gpio_chip *gpio_to_chip(unsigned gpio)
struct gpio_chip *gpio_to_chip(unsigned gpio)
{
return gpio_desc[gpio].chip;
}

1
include/asm-generic/gpio.h
View file

@ -135,6 +135,7 @@ 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 */