linux-kernel - [PATCH v2 1/3] clk: sprd: Switch from of_iomap() to devm_ioremap

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Date:   Wed, 22 May 2019 09:15:01 +0800
From:   Chunyan Zhang <zhang.chunyan@...aro.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Baolin Wang <baolin.wang@...aro.org>
Subject: [PATCH v2 1/3] clk: sprd: Switch from of_iomap() to devm_ioremap_resource()

devm_ioremap_resources() automatically requests resources and devm_ wrappers
do better error handling and unmapping of the I/O region when needed,
that would make drivers more clean and simple.

Signed-off-by: Chunyan Zhang <zhang.chunyan@...aro.org>
---
 drivers/clk/sprd/common.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/sprd/common.c b/drivers/clk/sprd/common.c
index e038b0447206..9ce690999eaa 100644
--- a/drivers/clk/sprd/common.c
+++ b/drivers/clk/sprd/common.c
@@ -42,6 +42,7 @@ int sprd_clk_regmap_init(struct platform_device *pdev,
 	void __iomem *base;
 	struct device_node *node = pdev->dev.of_node;
 	struct regmap *regmap;
+	struct resource *res;
 
 	if (of_find_property(node, "sprd,syscon", NULL)) {
 		regmap = syscon_regmap_lookup_by_phandle(node, "sprd,syscon");
@@ -50,7 +51,11 @@ int sprd_clk_regmap_init(struct platform_device *pdev,
 			return PTR_ERR(regmap);
 		}
 	} else {
-		base = of_iomap(node, 0);
+		res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+		base = devm_ioremap_resource(&pdev->dev, res);
+		if (IS_ERR(base))
+			return PTR_ERR(base);
+
 		regmap = devm_regmap_init_mmio(&pdev->dev, base,
 					       &sprdclk_regmap_config);
 		if (IS_ERR_OR_NULL(regmap)) {
-- 
2.17.1