platform/x86: intel_pmc_ipc: Switch to use driver->dev_groups

The driver core provides support for adding additional attributes for
devices via new ->dev_groups member of struct device_driver. Convert the
driver to use that instead of adding the attributes manually.
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/platform/x86/intel_pmc_ipc.c

@@ -539,6 +539,11 @@ static const struct attribute_group intel_ipc_group = {
 	.attrs = intel_ipc_attrs,
 };
 
+static const struct attribute_group *intel_ipc_groups[] = {
+	&intel_ipc_group,
+	NULL
+};
+
 static struct resource punit_res_array[] = {
 	/* Punit BIOS */
 	{
@@ -879,18 +884,10 @@ static int ipc_plat_probe(struct platform_device *pdev)
 		goto err_irq;
 	}
 
-	ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
-	if (ret) {
-		dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
-			ret);
-		goto err_sys;
-	}
-
 	ipcdev.has_gcr_regs = true;
 
 	return 0;
-err_sys:
-	devm_free_irq(&pdev->dev, ipcdev.irq, &ipcdev);
+
 err_irq:
 	platform_device_unregister(ipcdev.tco_dev);
 	platform_device_unregister(ipcdev.punit_dev);
@@ -901,7 +898,6 @@ static int ipc_plat_probe(struct platform_device *pdev)
 
 static int ipc_plat_remove(struct platform_device *pdev)
 {
-	sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
 	devm_free_irq(&pdev->dev, ipcdev.irq, &ipcdev);
 	platform_device_unregister(ipcdev.tco_dev);
 	platform_device_unregister(ipcdev.punit_dev);
@@ -916,6 +912,7 @@ static struct platform_driver ipc_plat_driver = {
 	.driver = {
 		.name = "pmc-ipc-plat",
 		.acpi_match_table = ACPI_PTR(ipc_acpi_ids),
+		.dev_groups = intel_ipc_groups,
 	},
 };