--- zzzz-none-000/linux-3.10.107/sound/soc/tegra/tegra20_das.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/sound/soc/tegra/tegra20_das.c	2021-02-04 17:41:59.000000000 +0000
@@ -128,12 +128,12 @@
 	.max_register = LAST_REG(DAC_INPUT_DATA_CLK_SEL),
 	.writeable_reg = tegra20_das_wr_rd_reg,
 	.readable_reg = tegra20_das_wr_rd_reg,
-	.cache_type = REGCACHE_RBTREE,
+	.cache_type = REGCACHE_FLAT,
 };
 
 static int tegra20_das_probe(struct platform_device *pdev)
 {
-	struct resource *res, *region;
+	struct resource *res;
 	void __iomem *regs;
 	int ret = 0;
 
@@ -149,24 +149,9 @@
 	das->dev = &pdev->dev;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "No memory resource\n");
-		ret = -ENODEV;
-		goto err;
-	}
-
-	region = devm_request_mem_region(&pdev->dev, res->start,
-					 resource_size(res), pdev->name);
-	if (!region) {
-		dev_err(&pdev->dev, "Memory region already claimed\n");
-		ret = -EBUSY;
-		goto err;
-	}
-
-	regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
-	if (!regs) {
-		dev_err(&pdev->dev, "ioremap failed\n");
-		ret = -ENOMEM;
+	regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(regs)) {
+		ret = PTR_ERR(regs);
 		goto err;
 	}
 
@@ -233,7 +218,6 @@
 	.remove = tegra20_das_remove,
 	.driver = {
 		.name = DRV_NAME,
-		.owner = THIS_MODULE,
 		.of_match_table = tegra20_das_of_match,
 	},
 };