video: da8xx-fb: use devres

Replace existing resource handling in the driver with managed device
resource.

v2: implement some changes as recommended by
	Prabhakar Lad <prabhakar.csengg@gmail.com>
Signed-off-by: NLad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: NDarren Etheridge <detheridge@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/da8xx-fb.c

@@ -133,7 +133,6 @@
 #define PALETTE_SIZE	256
 
 static void __iomem *da8xx_fb_reg_base;
-static struct resource *lcdc_regs;
 static unsigned int lcd_revision;
 static irq_handler_t lcdc_irq_handler;
 static wait_queue_head_t frame_done_wq;
@@ -1039,12 +1038,9 @@ static int fb_remove(struct platform_device *dev)
 				  par->p_palette_base);
 		dma_free_coherent(NULL, par->vram_size, par->vram_virt,
 				  par->vram_phys);
-		free_irq(par->irq, par);
 		pm_runtime_put_sync(&dev->dev);
 		pm_runtime_disable(&dev->dev);
 		framebuffer_release(info);
-		iounmap(da8xx_fb_reg_base);
-		release_mem_region(lcdc_regs->start, resource_size(lcdc_regs));
 
 	}
 	return 0;
@@ -1261,12 +1257,12 @@ static int fb_probe(struct platform_device *device)
 {
 	struct da8xx_lcdc_platform_data *fb_pdata =
 						device->dev.platform_data;
+	static struct resource *lcdc_regs;
 	struct lcd_ctrl_config *lcd_cfg;
 	struct fb_videomode *lcdc_info;
 	struct fb_info *da8xx_fb_info;
 	struct clk *fb_clk = NULL;
 	struct da8xx_fb_par *par;
-	resource_size_t len;
 	int ret, i;
 	unsigned long ulcm;
 
@@ -1276,29 +1272,14 @@ static int fb_probe(struct platform_device *device)
 	}
 
 	lcdc_regs = platform_get_resource(device, IORESOURCE_MEM, 0);
-	if (!lcdc_regs) {
-		dev_err(&device->dev,
-			"Can not get memory resource for LCD controller\n");
-		return -ENOENT;
-	}
-
-	len = resource_size(lcdc_regs);
-
-	lcdc_regs = request_mem_region(lcdc_regs->start, len, lcdc_regs->name);
-	if (!lcdc_regs)
-		return -EBUSY;
+	da8xx_fb_reg_base = devm_ioremap_resource(&device->dev, lcdc_regs);
+	if (IS_ERR(da8xx_fb_reg_base))
+		return PTR_ERR(da8xx_fb_reg_base);
 
-	da8xx_fb_reg_base = ioremap(lcdc_regs->start, len);
-	if (!da8xx_fb_reg_base) {
-		ret = -EBUSY;
-		goto err_request_mem;
-	}
-
-	fb_clk = clk_get(&device->dev, "fck");
+	fb_clk = devm_clk_get(&device->dev, "fck");
 	if (IS_ERR(fb_clk)) {
 		dev_err(&device->dev, "Can not get device clock\n");
-		ret = -ENODEV;
-		goto err_ioremap;
+		return PTR_ERR(fb_clk);
 	}
 
 	pm_runtime_enable(&device->dev);
@@ -1459,8 +1440,8 @@ static int fb_probe(struct platform_device *device)
 		lcdc_irq_handler = lcdc_irq_handler_rev02;
 	}
 
-	ret = request_irq(par->irq, lcdc_irq_handler, 0,
-			DRIVER_NAME, par);
+	ret = devm_request_irq(&device->dev, par->irq, lcdc_irq_handler, 0,
+			       DRIVER_NAME, par);
 	if (ret)
 		goto irq_freq;
 	return 0;
@@ -1489,12 +1470,6 @@ static int fb_probe(struct platform_device *device)
 	pm_runtime_put_sync(&device->dev);
 	pm_runtime_disable(&device->dev);
 
-err_ioremap:
-	iounmap(da8xx_fb_reg_base);
-
-err_request_mem:
-	release_mem_region(lcdc_regs->start, len);
-
 	return ret;
 }