[PATCH] ata: ahci_da850: use devm_platform_ioremap_resource()

[Rosen Penev <rosenp@gmail.com>]

Replace the open-coded platform_get_resource(IORESOURCE_MEM, 1) plus
devm_ioremap() sequence with devm_platform_ioremap_resource(pdev, 1),
which looks up resource index 1 (the power-down control register),
reserves it and maps it in one call, returning an ERR_PTR checked with
IS_ERR()/PTR_ERR(). Resource index 0 (the AHCI register block) is still
mapped separately as hpriv->mmio via ahci_platform_get_resources().

Built for ARM (davinci_all_defconfig + CONFIG_AHCI_DA850) with LLVM=1;
drivers/ata/ahci_da850.o compiles cleanly.

Assisted-by: opencode:hy3-free
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/ata/ahci_da850.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

diff --git a/drivers/ata/ahci_da850.c b/drivers/ata/ahci_da850.c
index f97566c420f8..4e53ff96d712 100644
--- a/drivers/ata/ahci_da850.c
+++ b/drivers/ata/ahci_da850.c
@@ -162,7 +162,6 @@ static int ahci_da850_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct ahci_host_priv *hpriv;
 	void __iomem *pwrdn_reg;
-	struct resource *res;
 	u32 mpy;
 	int rc;
 
@@ -198,22 +197,14 @@ static int ahci_da850_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
+	pwrdn_reg = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(pwrdn_reg))
+		return PTR_ERR(pwrdn_reg);
+
 	rc = ahci_platform_enable_resources(hpriv);
 	if (rc)
 		return rc;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (!res) {
-		rc = -ENODEV;
-		goto disable_resources;
-	}
-
-	pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res));
-	if (!pwrdn_reg) {
-		rc = -ENOMEM;
-		goto disable_resources;
-	}
-
 	da850_sata_init(dev, pwrdn_reg, hpriv->mmio, mpy);
 
 	rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info,
-- 
2.55.0