ata: pata_rb532_cf: use devm_platform_ioremap_resource()

Replace the open-coded platform_get_resource() plus devm_ioremap()
sequence with a single devm_platform_ioremap_resource() call, which folds
the resource lookup and mapping into one step and returns an ERR_PTR on
failure, checked with IS_ERR() and propagated via PTR_ERR(). Similar to
platform_get_irq(), it can return -EPROBE_DEFER so move it early.

The pata-rb532-cf platform device (arch/mips/rb532/devices.c) provides a
single IORESOURCE_MEM window at the DEV1BASE chip-select, distinct from
the other RB532 chip-selects, so the region reservation now performed by
devm_platform_ioremap_resource() introduces no conflict. The mapped size
is unchanged. Drop the redundant error message, as
devm_platform_ioremap_resource() already logs on failure.

Built for MIPS (rb532_defconfig) with LLVM=1;
drivers/ata/pata_rb532_cf.o compiles cleanly.

Assisted-by: opencode:hy3-free
Signed-off-by: Rosen Penev <[email protected]>
Signed-off-by: Damien Le Moal <[email protected]>

drivers/ata/pata_rb532_cf.c

@@ -103,16 +103,14 @@ static int rb532_pata_driver_probe(struct platform_device *pdev)
 {
 	int irq;
 	struct gpio_desc *gpiod;
-	struct resource *res;
 	struct ata_host *ah;
 	struct rb532_cf_info *info;
+	void __iomem *iobase;
 	int ret;
 
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		dev_err(&pdev->dev, "no IOMEM resource found\n");
-		return -EINVAL;
-	}
+	iobase = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(iobase))
+		return PTR_ERR(iobase);
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
@@ -139,11 +137,7 @@ static int rb532_pata_driver_probe(struct platform_device *pdev)
 	ah->private_data = info;
 	info->gpio_line = gpiod;
 	info->irq = irq;
-
-	info->iobase = devm_ioremap(&pdev->dev, res->start,
-				resource_size(res));
-	if (!info->iobase)
-		return -ENOMEM;
+	info->iobase = iobase;
 
 	rb532_pata_setup_ports(ah);