gpio: change member .dev to .parent

The name .dev in a struct is normally reserved for a struct device
that is let us say a superclass to the thing described by the struct.
struct gpio_chip stands out by confusingly using a struct device *dev
to point to the parent device (such as a platform_device) that
represents the hardware. As we want to give gpio_chip:s real devices,
this is not working. We need to rename this member to parent.

This was done by two coccinelle scripts, I guess it is possible to
combine them into one, but I don't know such stuff. They look like
this:

@@
struct gpio_chip *var;
@@
-var->dev
+var->parent

and:

@@
struct gpio_chip var;
@@
-var.dev
+var.parent

and:

@@
struct bgpio_chip *var;
@@
-var->gc.dev
+var->gc.parent

Plus a few instances of bgpio that I couldn't figure out how
to teach Coccinelle to rewrite.

This patch hits all over the place, but I *strongly* prefer this
solution to any piecemal approaches that just exercise patch
mechanics all over the place. It mainly hits drivers/gpio and
drivers/pinctrl which is my own backyard anyway.

Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Rafał Miłecki <zajec5@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Alek Du <alek.du@intel.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

3 files changed, 9 insertions, 8 deletions

diff --git a/drivers/pinctrl/samsung/pinctrl-exynos.c b/drivers/pinctrl/samsung/pinctrl-exynos.c
index 71ccf6a90b22..7d7374e57f16 100644
--- a/drivers/pinctrl/samsung/pinctrl-exynos.c
+++ b/drivers/pinctrl/samsung/pinctrl-exynos.c
@@ -176,7 +176,8 @@ static int exynos_irq_request_resources(struct irq_data *irqd)
 
 	ret = gpiochip_lock_as_irq(&bank->gpio_chip, irqd->hwirq);
 	if (ret) {
-		dev_err(bank->gpio_chip.dev, "unable to lock pin %s-%lu IRQ\n",
+		dev_err(bank->gpio_chip.parent,
+			"unable to lock pin %s-%lu IRQ\n",
 			bank->name, irqd->hwirq);
 		return ret;
 	}
diff --git a/drivers/pinctrl/samsung/pinctrl-exynos5440.c b/drivers/pinctrl/samsung/pinctrl-exynos5440.c
index 82dc109f7ed4..f61f9a6fa9af 100644
--- a/drivers/pinctrl/samsung/pinctrl-exynos5440.c
+++ b/drivers/pinctrl/samsung/pinctrl-exynos5440.c
@@ -539,7 +539,7 @@ static const struct pinconf_ops exynos5440_pinconf_ops = {
 /* gpiolib gpio_set callback function */
 static void exynos5440_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 {
-	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
+	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->parent);
 	void __iomem *base = priv->reg_base;
 	u32 data;
 
@@ -553,7 +553,7 @@ static void exynos5440_gpio_set(struct gpio_chip *gc, unsigned offset, int value
 /* gpiolib gpio_get callback function */
 static int exynos5440_gpio_get(struct gpio_chip *gc, unsigned offset)
 {
-	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
+	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->parent);
 	void __iomem *base = priv->reg_base;
 	u32 data;
 
@@ -566,7 +566,7 @@ static int exynos5440_gpio_get(struct gpio_chip *gc, unsigned offset)
 /* gpiolib gpio_direction_input callback function */
 static int exynos5440_gpio_direction_input(struct gpio_chip *gc, unsigned offset)
 {
-	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
+	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->parent);
 	void __iomem *base = priv->reg_base;
 	u32 data;
 
@@ -586,7 +586,7 @@ static int exynos5440_gpio_direction_input(struct gpio_chip *gc, unsigned offset
 static int exynos5440_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
 							int value)
 {
-	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
+	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->parent);
 	void __iomem *base = priv->reg_base;
 	u32 data;
 
@@ -607,7 +607,7 @@ static int exynos5440_gpio_direction_output(struct gpio_chip *gc, unsigned offse
 /* gpiolib gpio_to_irq callback function */
 static int exynos5440_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
 {
-	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->dev);
+	struct exynos5440_pinctrl_priv_data *priv = dev_get_drvdata(gc->parent);
 	unsigned int virq;
 
 	if (offset < 16 || offset > 23)
@@ -817,7 +817,7 @@ static int exynos5440_gpiolib_register(struct platform_device *pdev,
 	priv->gc = gc;
 	gc->base = 0;
 	gc->ngpio = EXYNOS5440_MAX_PINS;
-	gc->dev = &pdev->dev;
+	gc->parent = &pdev->dev;
 	gc->set = exynos5440_gpio_set;
 	gc->get = exynos5440_gpio_get;
 	gc->direction_input = exynos5440_gpio_direction_input;
diff --git a/drivers/pinctrl/samsung/pinctrl-samsung.c b/drivers/pinctrl/samsung/pinctrl-samsung.c
index 3f622ccd8eab..bb4db2050f19 100644
--- a/drivers/pinctrl/samsung/pinctrl-samsung.c
+++ b/drivers/pinctrl/samsung/pinctrl-samsung.c
@@ -914,7 +914,7 @@ static int samsung_gpiolib_register(struct platform_device *pdev,
 		gc = &bank->gpio_chip;
 		gc->base = drvdata->pin_base + bank->pin_base;
 		gc->ngpio = bank->nr_pins;
-		gc->dev = &pdev->dev;
+		gc->parent = &pdev->dev;
 		gc->of_node = bank->of_node;
 		gc->label = bank->name;