Platform drivers, provide a way to add sysfs groups easily

@@ -354,10 +354,7 @@ static struct attribute *gpio_keys_attrs[] = {
 	&dev_attr_disabled_switches.attr,
 	NULL,
 };
-
-static const struct attribute_group gpio_keys_attr_group = {
-	.attrs = gpio_keys_attrs,
-};
+ATTRIBUTE_GROUPS(gpio_keys);
 
 static void gpio_keys_gpio_report_event(struct gpio_button_data *bdata)
 {

@@ -856,13 +853,6 @@ static int gpio_keys_probe(struct platform_device *pdev)
 
 	fwnode_handle_put(child);
 
-	error = devm_device_add_group(dev, &gpio_keys_attr_group);
-	if (error) {
-		dev_err(dev, "Unable to export keys/switches, error: %d\n",
-			error);
-		return error;
-	}
-
 	error = input_register_device(input);
 	if (error) {
 		dev_err(dev, "Unable to register input device, error: %d\n",

@@ -1025,6 +1015,7 @@ static void gpio_keys_shutdown(struct platform_device *pdev)
 }
 
 static struct platform_driver gpio_keys_device_driver = {
+	.dev_groups	= gpio_keys_groups,
 	.probe		= gpio_keys_probe,
 	.shutdown	= gpio_keys_shutdown,
 	.driver		= {

@@ -168,6 +168,15 @@ static ssize_t fastpllclk_store(struct device *dev, struct device_attribute *att
 
 static DEVICE_ATTR_RW(fastpllclk);
 
+static struct attribute *w100fb_attrs[] = {
+	&dev_attr_fastpllclk.attr,
+	&dev_attr_reg_read.attr,
+	&dev_attr_reg_write.attr,
+	&dev_attr_flip.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(w100fb);
+
 /*
  * Some touchscreens need hsync information from the video driver to
  * function correctly. We export it here.

@@ -756,14 +765,6 @@ int w100fb_probe(struct platform_device *pdev)
 		goto out;
 	}
 
-	err = device_create_file(&pdev->dev, &dev_attr_fastpllclk);
-	err |= device_create_file(&pdev->dev, &dev_attr_reg_read);
-	err |= device_create_file(&pdev->dev, &dev_attr_reg_write);
-	err |= device_create_file(&pdev->dev, &dev_attr_flip);
-
-	if (err != 0)
-		fb_warn(info, "failed to register attributes (%d)\n", err);
-
 	fb_info(info, "%s frame buffer device\n", info->fix.id);
 	return 0;
 out:

@@ -788,11 +789,6 @@ static int w100fb_remove(struct platform_device *pdev)
 	struct fb_info *info = platform_get_drvdata(pdev);
 	struct w100fb_par *par=info->par;
 
-	device_remove_file(&pdev->dev, &dev_attr_fastpllclk);
-	device_remove_file(&pdev->dev, &dev_attr_reg_read);
-	device_remove_file(&pdev->dev, &dev_attr_reg_write);
-	device_remove_file(&pdev->dev, &dev_attr_flip);
-
 	unregister_framebuffer(info);
 
 	vfree(par->saved_intmem);

@@ -1630,6 +1626,7 @@ static struct platform_driver w100fb_driver = {
 	.driver		= {
 		.name	= "w100fb",
 	},
+	.dev_groups	= w100fb_groups,
 };
 
 module_platform_driver(w100fb_driver);

@@ -1274,6 +1274,14 @@ static ssize_t sm501fb_debug_show_pnl(struct device *dev,
 
 static DEVICE_ATTR(fbregs_pnl, 0444, sm501fb_debug_show_pnl, NULL);
 
+static struct attribute *sm501fb_attrs[] = {
+	&dev_attr_crt_src.attr,
+	&dev_attr_fbregs_pnl.attr,
+	&dev_attr_fbregs_crt.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(sm501fb);
+
 /* acceleration operations */
 static int sm501fb_sync(struct fb_info *info)
 {

@@ -2016,33 +2024,9 @@ static int sm501fb_probe(struct platform_device *pdev)
 		goto err_started_crt;
 	}
 
-	/* create device files */
-
-	ret = device_create_file(dev, &dev_attr_crt_src);
-	if (ret)
-		goto err_started_panel;
-
-	ret = device_create_file(dev, &dev_attr_fbregs_pnl);
-	if (ret)
-		goto err_attached_crtsrc_file;
-
-	ret = device_create_file(dev, &dev_attr_fbregs_crt);
-	if (ret)
-		goto err_attached_pnlregs_file;
-
 	/* we registered, return ok */
 	return 0;
 
-err_attached_pnlregs_file:
-	device_remove_file(dev, &dev_attr_fbregs_pnl);
-
-err_attached_crtsrc_file:
-	device_remove_file(dev, &dev_attr_crt_src);
-
-err_started_panel:
-	unregister_framebuffer(info->fb[HEAD_PANEL]);
-	sm501_free_init_fb(info, HEAD_PANEL);
-
 err_started_crt:
 	unregister_framebuffer(info->fb[HEAD_CRT]);
 	sm501_free_init_fb(info, HEAD_CRT);

@@ -2072,10 +2056,6 @@ static int sm501fb_remove(struct platform_device *pdev)
 	struct fb_info	   *fbinfo_crt = info->fb[0];
 	struct fb_info	   *fbinfo_pnl = info->fb[1];
 
-	device_remove_file(&pdev->dev, &dev_attr_fbregs_crt);
-	device_remove_file(&pdev->dev, &dev_attr_fbregs_pnl);
-	device_remove_file(&pdev->dev, &dev_attr_crt_src);
-
 	sm501_free_init_fb(info, HEAD_CRT);
 	sm501_free_init_fb(info, HEAD_PANEL);
 

@@ -2233,6 +2213,7 @@ static int sm501fb_resume(struct platform_device *pdev)
 #endif
 
 static struct platform_driver sm501fb_driver = {
+	.dev_groups	= sm501fb_groups,
 	.probe		= sm501fb_probe,
 	.remove		= sm501fb_remove,
 	.suspend	= sm501fb_suspend,

@@ -184,6 +184,12 @@ static ssize_t contrast_store(struct device *dev,
 
 static DEVICE_ATTR_RW(contrast);
 
+static struct attribute *wm8505fb_attrs[] = {
+	&dev_attr_contrast.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(wm8505fb);
+
 static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
 {
 	chan &= 0xffff;

@@ -369,10 +375,6 @@ static int wm8505fb_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = device_create_file(&pdev->dev, &dev_attr_contrast);
-	if (ret < 0)
-		fb_warn(&fbi->fb, "failed to register attributes (%d)\n", ret);
-
 	fb_info(&fbi->fb, "%s frame buffer at 0x%lx-0x%lx\n",
 		fbi->fb.fix.id, fbi->fb.fix.smem_start,
 		fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);

@@ -384,8 +386,6 @@ static int wm8505fb_remove(struct platform_device *pdev)
 {
 	struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
 
-	device_remove_file(&pdev->dev, &dev_attr_contrast);
-
 	unregister_framebuffer(&fbi->fb);
 
 	writel(0, fbi->regbase);

@@ -402,6 +402,7 @@ static const struct of_device_id wmt_dt_ids[] = {
 };
 
 static struct platform_driver wm8505fb_driver = {
+	.dev_groups	= wm8505fb_groups,
 	.probe		= wm8505fb_probe,
 	.remove		= wm8505fb_remove,
 	.driver		= {