uio: uio_fsl_elbc_gpcm: convert platform driver to use dev_groups

Platform drivers now have the option to have the platform core create
and remove any needed sysfs attribute files.  So take advantage of that
and do not register "by hand" a sysfs group of attributes.

Link: https://lore.kernel.org/r/20190731124349.4474-3-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/uio/uio_fsl_elbc_gpcm.c

@@ -71,6 +71,13 @@ static ssize_t reg_store(struct device *dev, struct device_attribute *attr,
 static DEVICE_ATTR(reg_br, 0664, reg_show, reg_store);
 static DEVICE_ATTR(reg_or, 0664, reg_show, reg_store);
 
+static struct attribute *uio_fsl_elbc_gpcm_attrs[] = {
+	&dev_attr_reg_br.attr,
+	&dev_attr_reg_or.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(uio_fsl_elbc_gpcm);
+
 static ssize_t reg_show(struct device *dev, struct device_attribute *attr,
 			char *buf)
 {
@@ -411,25 +418,12 @@ static int uio_fsl_elbc_gpcm_probe(struct platform_device *pdev)
 	/* store private data */
 	platform_set_drvdata(pdev, info);
 
-	/* create sysfs files */
-	ret = device_create_file(priv->dev, &dev_attr_reg_br);
-	if (ret)
-		goto out_err3;
-	ret = device_create_file(priv->dev, &dev_attr_reg_or);
-	if (ret)
-		goto out_err4;
-
 	dev_info(priv->dev,
 		 "eLBC/GPCM device (%s) at 0x%llx, bank %d, irq=%d\n",
 		 priv->name, (unsigned long long)res.start, priv->bank,
 		 irq != NO_IRQ ? irq : -1);
 
 	return 0;
-out_err4:
-	device_remove_file(priv->dev, &dev_attr_reg_br);
-out_err3:
-	platform_set_drvdata(pdev, NULL);
-	uio_unregister_device(info);
 out_err2:
 	if (priv->shutdown)
 		priv->shutdown(info, true);
@@ -448,8 +442,6 @@ static int uio_fsl_elbc_gpcm_remove(struct platform_device *pdev)
 	struct uio_info *info = platform_get_drvdata(pdev);
 	struct fsl_elbc_gpcm *priv = info->priv;
 
-	device_remove_file(priv->dev, &dev_attr_reg_or);
-	device_remove_file(priv->dev, &dev_attr_reg_br);
 	platform_set_drvdata(pdev, NULL);
 	uio_unregister_device(info);
 	if (priv->shutdown)
@@ -474,6 +466,7 @@ static struct platform_driver uio_fsl_elbc_gpcm_driver = {
 	.driver = {
 		.name = "fsl,elbc-gpcm-uio",
 		.of_match_table = uio_fsl_elbc_gpcm_match,
+		.dev_groups = uio_fsl_elbc_gpcm_groups,
 	},
 	.probe = uio_fsl_elbc_gpcm_probe,
 	.remove = uio_fsl_elbc_gpcm_remove,