gpio: ge: Make driver OF-independent

There is nothing in the driver that requires OF APIs,
make the driver OF independent.

Signed-off-by: Andy Shevchenko <[e-mail]>
Acked-by: Randy Dunlap <[e-mail]>
Tested-by: Randy Dunlap <[e-mail]> # build-tested
Signed-off-by: Bartosz Golaszewski <[e-mail]>

drivers/gpio/gpio-ge.c

···
 #include <linux/gpio/driver.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/mod_devicetable.h>
 #include <linux/module.h>
-#include <linux/of_address.h>
-#include <linux/of.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 
 #define GEF_GPIO_DIRECT		0x00
···
 
 static int __init gef_gpio_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	struct gpio_chip *gc;
 	void __iomem *regs;
 	int ret;
···
 	if (!gc)
 		return -ENOMEM;
 
-	regs = of_iomap(pdev->dev.of_node, 0);
-	if (!regs)
-		return -ENOMEM;
+	regs = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
 
 	ret = bgpio_init(gc, &pdev->dev, 4, regs + GEF_GPIO_IN,
 			 regs + GEF_GPIO_OUT, NULL, NULL,
 			 regs + GEF_GPIO_DIRECT, BGPIOF_BIG_ENDIAN_BYTE_ORDER);
-	if (ret) {
-		dev_err(&pdev->dev, "bgpio_init failed\n");
-		goto err0;
-	}
+	if (ret)
+		return dev_err_probe(dev, ret, "bgpio_init failed\n");
 
 	/* Setup pointers to chip functions */
-	gc->label = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOF", pdev->dev.of_node);
-	if (!gc->label) {
-		ret = -ENOMEM;
-		goto err0;
-	}
+	gc->label = devm_kasprintf(dev, GFP_KERNEL, "%pfw", dev_fwnode(dev));
+	if (!gc->label)
+		return -ENOMEM;
 
 	gc->base = -1;
-	gc->ngpio = (u16)(uintptr_t)of_device_get_match_data(&pdev->dev);
+	gc->ngpio = (uintptr_t)device_get_match_data(dev);
 
 	/* This function adds a memory mapped GPIO chip */
 	ret = devm_gpiochip_add_data(&pdev->dev, gc, NULL);
 	if (ret)
-		goto err0;
+		return dev_err_probe(dev, ret, "GPIO chip registration failed\n");
 
 	return 0;
-err0:
-	iounmap(regs);
-	pr_err("%pOF: GPIO chip registration failed\n", pdev->dev.of_node);
-	return ret;
 };
 
 static struct platform_driver gef_gpio_driver = {