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Subject[PATCH 2/4] gpio/powerpc: Eliminate duplication of of_get_named_gpio_flags()
Date
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>
---
arch/powerpc/sysdev/qe_lib/gpio.c | 42 +++++++-----------------------------
drivers/gpio/gpiolib.c | 2 +-
include/asm-generic/gpio.h | 1 +
3 files changed, 10 insertions(+), 35 deletions(-)
diff --git a/arch/powerpc/sysdev/qe_lib/gpio.c b/arch/powerpc/sysdev/qe_lib/gpio.c
index e23f23c..521e67a 100644
--- a/arch/powerpc/sysdev/qe_lib/gpio.c
+++ b/arch/powerpc/sysdev/qe_lib/gpio.c
@@ -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;
- }
-
- 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;
+ goto err0;
}

- 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);
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index a971e3d..dc315e9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -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;
}
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 8c86210..6b10bdc 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -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 */
--
1.7.5.4


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