linux-kernel - [PATCH 1/2] gpio: mpc8xxx: use a helper variable to store the address of pdev->dev

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Message-ID: <20241009162910.33477-1-brgl@bgdev.pl>
Date: Wed,  9 Oct 2024 18:29:09 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: linux-gpio@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH 1/2] gpio: mpc8xxx: use a helper variable to store the address of pdev->dev

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Instead of repeatedly dereferencing pdev, just store the address of the
embedded struct device in a local variable and use it instead for
improved readability.

While at it: rearrange variable declarations.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/gpio/gpio-mpc8xxx.c | 46 +++++++++++++++++--------------------
 1 file changed, 21 insertions(+), 25 deletions(-)

diff --git a/drivers/gpio/gpio-mpc8xxx.c b/drivers/gpio/gpio-mpc8xxx.c
index 685ec31db409..30f36f94ba1b 100644
--- a/drivers/gpio/gpio-mpc8xxx.c
+++ b/drivers/gpio/gpio-mpc8xxx.c
@@ -300,14 +300,15 @@ static const struct of_device_id mpc8xxx_gpio_ids[] = {
 
 static int mpc8xxx_probe(struct platform_device *pdev)
 {
+	const struct mpc8xxx_gpio_devtype *devtype = NULL;
 	struct device_node *np = pdev->dev.of_node;
 	struct mpc8xxx_gpio_chip *mpc8xxx_gc;
-	struct gpio_chip	*gc;
-	const struct mpc8xxx_gpio_devtype *devtype = NULL;
+	struct device *dev = &pdev->dev;
 	struct fwnode_handle *fwnode;
+	struct gpio_chip *gc;
 	int ret;
 
-	mpc8xxx_gc = devm_kzalloc(&pdev->dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
+	mpc8xxx_gc = devm_kzalloc(dev, sizeof(*mpc8xxx_gc), GFP_KERNEL);
 	if (!mpc8xxx_gc)
 		return -ENOMEM;
 
@@ -320,32 +321,28 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 		return PTR_ERR(mpc8xxx_gc->regs);
 
 	gc = &mpc8xxx_gc->gc;
-	gc->parent = &pdev->dev;
+	gc->parent = dev;
 
-	if (device_property_read_bool(&pdev->dev, "little-endian")) {
-		ret = bgpio_init(gc, &pdev->dev, 4,
-				 mpc8xxx_gc->regs + GPIO_DAT,
-				 NULL, NULL,
-				 mpc8xxx_gc->regs + GPIO_DIR, NULL,
-				 BGPIOF_BIG_ENDIAN);
+	if (device_property_read_bool(dev, "little-endian")) {
+		ret = bgpio_init(gc, dev, 4, mpc8xxx_gc->regs + GPIO_DAT,
+				 NULL, NULL, mpc8xxx_gc->regs + GPIO_DIR,
+				 NULL, BGPIOF_BIG_ENDIAN);
 		if (ret)
 			return ret;
-		dev_dbg(&pdev->dev, "GPIO registers are LITTLE endian\n");
+		dev_dbg(dev, "GPIO registers are LITTLE endian\n");
 	} else {
-		ret = bgpio_init(gc, &pdev->dev, 4,
-				 mpc8xxx_gc->regs + GPIO_DAT,
-				 NULL, NULL,
-				 mpc8xxx_gc->regs + GPIO_DIR, NULL,
-				 BGPIOF_BIG_ENDIAN
+		ret = bgpio_init(gc, dev, 4, mpc8xxx_gc->regs + GPIO_DAT,
+				 NULL, NULL, mpc8xxx_gc->regs + GPIO_DIR,
+				 NULL, BGPIOF_BIG_ENDIAN
 				 | BGPIOF_BIG_ENDIAN_BYTE_ORDER);
 		if (ret)
 			return ret;
-		dev_dbg(&pdev->dev, "GPIO registers are BIG endian\n");
+		dev_dbg(dev, "GPIO registers are BIG endian\n");
 	}
 
 	mpc8xxx_gc->direction_output = gc->direction_output;
 
-	devtype = device_get_match_data(&pdev->dev);
+	devtype = device_get_match_data(dev);
 	if (!devtype)
 		devtype = &mpc8xxx_gpio_devtype_default;
 
@@ -370,7 +367,7 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 	 * associated input enable must be set (GPIOxGPIE[IEn]=1) to propagate
 	 * the port value to the GPIO Data Register.
 	 */
-	fwnode = dev_fwnode(&pdev->dev);
+	fwnode = dev_fwnode(dev);
 	if (of_device_is_compatible(np, "fsl,qoriq-gpio") ||
 	    of_device_is_compatible(np, "fsl,ls1028a-gpio") ||
 	    of_device_is_compatible(np, "fsl,ls1088a-gpio") ||
@@ -381,9 +378,9 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 			gc->read_reg(mpc8xxx_gc->regs + GPIO_DIR);
 	}
 
-	ret = devm_gpiochip_add_data(&pdev->dev, gc, mpc8xxx_gc);
+	ret = devm_gpiochip_add_data(dev, gc, mpc8xxx_gc);
 	if (ret) {
-		dev_err(&pdev->dev,
+		dev_err(dev,
 			"GPIO chip registration failed with status %d\n", ret);
 		return ret;
 	}
@@ -404,18 +401,17 @@ static int mpc8xxx_probe(struct platform_device *pdev)
 	gc->write_reg(mpc8xxx_gc->regs + GPIO_IER, 0xffffffff);
 	gc->write_reg(mpc8xxx_gc->regs + GPIO_IMR, 0);
 
-	ret = devm_request_irq(&pdev->dev, mpc8xxx_gc->irqn,
+	ret = devm_request_irq(dev, mpc8xxx_gc->irqn,
 			       mpc8xxx_gpio_irq_cascade,
 			       IRQF_NO_THREAD | IRQF_SHARED, "gpio-cascade",
 			       mpc8xxx_gc);
 	if (ret) {
-		dev_err(&pdev->dev,
-			"failed to devm_request_irq(%d), ret = %d\n",
+		dev_err(dev, "failed to devm_request_irq(%d), ret = %d\n",
 			mpc8xxx_gc->irqn, ret);
 		goto err;
 	}
 
-	device_init_wakeup(&pdev->dev, true);
+	device_init_wakeup(dev, true);
 
 	return 0;
 err:
-- 
2.43.0