linux-kernel - [PATCH 2/5] gpio: davinci: Use dev name for label and automatic base selection

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Date:   Fri, 31 Aug 2018 14:13:23 -0500
From:   "Andrew F. Davis" <afd@...com>
To:     Sekhar Nori <nsekhar@...com>, Kevin Hilman <khilman@...nel.org>,
        Keerthy <j-keerthy@...com>,
        Linus Walleij <linus.walleij@...aro.org>
CC:     <linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Andrew F . Davis" <afd@...com>
Subject: [PATCH 2/5] gpio: davinci: Use dev name for label and automatic base selection

Use dev_name to get a unique label and use -1 for a base to get our
selection automatically. We pull in all GPIOs per chip now so this
does not have the effect of out of order labels like before.

We do these both together so we can drop all the static data in one
patch. This also lets us normalize the return paths as we don't need
any cleanup after this change.

Signed-off-by: Andrew F. Davis <afd@...com>
---
 drivers/gpio/gpio-davinci.c | 22 ++++------------------
 1 file changed, 4 insertions(+), 18 deletions(-)

diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
index a5ece8ea79bc..14d1729927d3 100644
--- a/drivers/gpio/gpio-davinci.c
+++ b/drivers/gpio/gpio-davinci.c
@@ -41,7 +41,6 @@ struct davinci_gpio_regs {
 typedef struct irq_chip *(*gpio_get_irq_chip_cb_t)(unsigned int irq);
 
 #define BINTEN	0x8 /* GPIO Interrupt Per-Bank Enable Register */
-#define MAX_LABEL_SIZE 20
 
 static void __iomem *gpio_base;
 static unsigned int offset_array[5] = {0x10, 0x38, 0x60, 0x88, 0xb0};
@@ -166,14 +165,12 @@ davinci_gpio_get_pdata(struct platform_device *pdev)
 
 static int davinci_gpio_probe(struct platform_device *pdev)
 {
-	static int ctrl_num, bank_base;
 	int gpio, bank, i, ret = 0;
 	unsigned int ngpio, nbank, nirq;
 	struct davinci_gpio_controller *chips;
 	struct davinci_gpio_platform_data *pdata;
 	struct device *dev = &pdev->dev;
 	struct resource *res;
-	char label[MAX_LABEL_SIZE];
 
 	pdata = davinci_gpio_get_pdata(pdev);
 	if (!pdata) {
@@ -228,10 +225,7 @@ static int davinci_gpio_probe(struct platform_device *pdev)
 		}
 	}
 
-	snprintf(label, MAX_LABEL_SIZE, "davinci_gpio.%d", ctrl_num++);
-	chips->chip.label = devm_kstrdup(dev, label, GFP_KERNEL);
-		if (!chips->chip.label)
-			return -ENOMEM;
+	chips->chip.label = dev_name(dev);
 
 	chips->chip.direction_input = davinci_direction_in;
 	chips->chip.get = davinci_gpio_get;
@@ -239,7 +233,7 @@ static int davinci_gpio_probe(struct platform_device *pdev)
 	chips->chip.set = davinci_gpio_set;
 
 	chips->chip.ngpio = ngpio;
-	chips->chip.base = bank_base;
+	chips->chip.base = -1;
 
 #ifdef CONFIG_OF_GPIO
 	chips->chip.of_gpio_n_cells = 2;
@@ -252,28 +246,20 @@ static int davinci_gpio_probe(struct platform_device *pdev)
 	}
 #endif
 	spin_lock_init(&chips->lock);
-	bank_base += ngpio;
 
 	for (gpio = 0, bank = 0; gpio < ngpio; gpio += 32, bank++)
 		chips->regs[bank] = gpio_base + offset_array[bank];
 
 	ret = devm_gpiochip_add_data(dev, &chips->chip, chips);
 	if (ret)
-		goto err;
+		return ret;
 
 	platform_set_drvdata(pdev, chips);
 	ret = davinci_gpio_irq_setup(pdev);
 	if (ret)
-		goto err;
+		return ret;
 
 	return 0;
-
-err:
-	/* Revert the static variable increments */
-	ctrl_num--;
-	bank_base -= ngpio;
-
-	return ret;
 }
 
 /*--------------------------------------------------------------------------*/
-- 
2.18.0