gpio: ml-ioh: Convert to dev_pm_ops

Convert the legacy callback .suspend() and .resume()
to the generic ones.

While at it, replace ifdeffery by __maybe_unused attribute.

Signed-off-by: Vaibhav Gupta <[e-mail]>
Signed-off-by: Andy Shevchenko <[e-mail]>

drivers/gpio/gpio-ml-ioh.c

···
 	return 0;
 }
 
-#ifdef CONFIG_PM
 /*
  * Save register configuration and disable interrupts.
  */
-static void ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
+static void __maybe_unused ioh_gpio_save_reg_conf(struct ioh_gpio *chip)
 {
 	int i;
 
···
 /*
  * This function restores the register configuration of the GPIO device.
  */
-static void ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
+static void __maybe_unused ioh_gpio_restore_reg_conf(struct ioh_gpio *chip)
 {
 	int i;
 
···
 				  &chip->reg->ioh_sel_reg[i]);
 	}
 }
-#endif
 
 static int ioh_gpio_to_irq(struct gpio_chip *gpio, unsigned offset)
 {
···
 	kfree(chip);
 }
 
-#ifdef CONFIG_PM
-static int ioh_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
+static int __maybe_unused ioh_gpio_suspend(struct device *dev)
 {
-	s32 ret;
-	struct ioh_gpio *chip = pci_get_drvdata(pdev);
+	struct ioh_gpio *chip = dev_get_drvdata(dev);
 	unsigned long flags;
 
 	spin_lock_irqsave(&chip->spinlock, flags);
 	ioh_gpio_save_reg_conf(chip);
 	spin_unlock_irqrestore(&chip->spinlock, flags);
 
-	ret = pci_save_state(pdev);
-	if (ret) {
-		dev_err(&pdev->dev, "pci_save_state Failed-%d\n", ret);
-		return ret;
-	}
-	pci_disable_device(pdev);
-	pci_set_power_state(pdev, PCI_D0);
-	ret = pci_enable_wake(pdev, PCI_D0, 1);
-	if (ret)
-		dev_err(&pdev->dev, "pci_enable_wake Failed -%d\n", ret);
-
 	return 0;
 }
 
-static int ioh_gpio_resume(struct pci_dev *pdev)
+static int __maybe_unused ioh_gpio_resume(struct device *dev)
 {
-	s32 ret;
-	struct ioh_gpio *chip = pci_get_drvdata(pdev);
+	struct ioh_gpio *chip = dev_get_drvdata(dev);
 	unsigned long flags;
-
-	ret = pci_enable_wake(pdev, PCI_D0, 0);
-
-	pci_set_power_state(pdev, PCI_D0);
-	ret = pci_enable_device(pdev);
-	if (ret) {
-		dev_err(&pdev->dev, "pci_enable_device Failed-%d ", ret);
-		return ret;
-	}
-	pci_restore_state(pdev);
 
 	spin_lock_irqsave(&chip->spinlock, flags);
 	iowrite32(0x01, &chip->reg->srst);
···
 
 	return 0;
 }
-#else
-#define ioh_gpio_suspend NULL
-#define ioh_gpio_resume NULL
-#endif
+
+static SIMPLE_DEV_PM_OPS(ioh_gpio_pm_ops, ioh_gpio_suspend, ioh_gpio_resume);
 
 static const struct pci_device_id ioh_gpio_pcidev_id[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_ROHM, 0x802E) },
···
 	.id_table = ioh_gpio_pcidev_id,
 	.probe = ioh_gpio_probe,
 	.remove = ioh_gpio_remove,
-	.suspend = ioh_gpio_suspend,
-	.resume = ioh_gpio_resume
+	.driver = {
+		.pm = &ioh_gpio_pm_ops,
+	},
 };
 
 module_pci_driver(ioh_gpio_driver);