diff mbox

[112/182] pinctrl: samsung: use gpiochip data pointer

Message ID 1449667992-3104-1-git-send-email-linus.walleij@linaro.org
State Accepted
Commit 9f57f81c129f0f9456f78f00235f70ac5e21e0f5
Headers show

Commit Message

Linus Walleij Dec. 9, 2015, 1:33 p.m. UTC 
This makes the driver use the data pointer added to the gpio_chip
to store a pointer to the state container instead of relying on
container_of().

Cc: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

---
 drivers/pinctrl/samsung/pinctrl-samsung.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

-- 
2.4.3

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Comments

Linus Walleij Dec. 14, 2015, 1:55 p.m. UTC | #1 
On Fri, Dec 11, 2015 at 7:14 AM, Tomasz Figa <tomasz.figa@gmail.com> wrote:
> Hi Linus,

>

> 2015-12-09 22:33 GMT+09:00 Linus Walleij <linus.walleij@linaro.org>:

>> This makes the driver use the data pointer added to the gpio_chip

>> to store a pointer to the state container instead of relying on

>> container_of().

>

> I always thought container_of() was preferred because of higher type

> safety than void *data pointers. Is there any reason for mandating the

> (IMHO worse) new method of accessing data, even though the one

> currently used seems to be still valid?


This is explained in patch 000/182:
http://marc.info/?l=linux-gpio&m=144966662402660&w=2

In the generic GPIO case it gets really really messy with
container_of(container_of(x)) in every driver, making the code
so hard to read that it becomes a pain to maintain and do the
right thing, trumping any type safety.

Unless someone has a real performance issue I think this is
the way to go.

Yours,
Linus Walleij
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diff mbox

Patch

diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
index bb4db2050f19..a4fb8379f521 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.c
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
@@ -50,11 +50,6 @@  static LIST_HEAD(drvdata_list);
 
 static unsigned int pin_base;
 
-static inline struct samsung_pin_bank *gc_to_pin_bank(struct gpio_chip *gc)
-{
-	return container_of(gc, struct samsung_pin_bank, gpio_chip);
-}
-
 static int samsung_get_group_count(struct pinctrl_dev *pctldev)
 {
 	struct samsung_pinctrl_drv_data *pmx = pinctrl_dev_get_drvdata(pctldev);
@@ -522,7 +517,7 @@  static const struct pinconf_ops samsung_pinconf_ops = {
 /* gpiolib gpio_set callback function */
 static void samsung_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 {
-	struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
+	struct samsung_pin_bank *bank = gpiochip_get_data(gc);
 	const struct samsung_pin_bank_type *type = bank->type;
 	unsigned long flags;
 	void __iomem *reg;
@@ -546,7 +541,7 @@  static int samsung_gpio_get(struct gpio_chip *gc, unsigned offset)
 {
 	void __iomem *reg;
 	u32 data;
-	struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
+	struct samsung_pin_bank *bank = gpiochip_get_data(gc);
 	const struct samsung_pin_bank_type *type = bank->type;
 
 	reg = bank->drvdata->virt_base + bank->pctl_offset;
@@ -571,7 +566,7 @@  static int samsung_gpio_set_direction(struct gpio_chip *gc,
 	u32 data, mask, shift;
 	unsigned long flags;
 
-	bank = gc_to_pin_bank(gc);
+	bank = gpiochip_get_data(gc);
 	type = bank->type;
 	drvdata = bank->drvdata;
 
@@ -619,7 +614,7 @@  static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
  */
 static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 {
-	struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
+	struct samsung_pin_bank *bank = gpiochip_get_data(gc);
 	unsigned int virq;
 
 	if (!bank->irq_domain)
@@ -918,7 +913,7 @@  static int samsung_gpiolib_register(struct platform_device *pdev,
 		gc->of_node = bank->of_node;
 		gc->label = bank->name;
 
-		ret = gpiochip_add(gc);
+		ret = gpiochip_add_data(gc, bank);
 		if (ret) {
 			dev_err(&pdev->dev, "failed to register gpio_chip %s, error code: %d\n",
 							gc->label, ret);