[PATCHv2 4/8] gpio: ppc44x: Use platform resource helper for GPIO MMIO

[Rosen Penev <rosenp@gmail.com>]

Map the PPC44x GPIO register block through the platform device
resource instead of reparsing the firmware node directly.

The GPIO node now probes as a platform device, so use the
platform helper to keep resource handling aligned with the converted
driver model and to report mapping failures with the platform device
context.

Move ioremap up in order to avoid doing extra work in case of
-EPROBE_DEFER.

Assisted-by: Codex:GPT-5.5
Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/gpio/gpio-ppc44x.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpio/gpio-ppc44x.c b/drivers/gpio/gpio-ppc44x.c
index 99fb11cd7966..5db5217c0225 100644
--- a/drivers/gpio/gpio-ppc44x.c
+++ b/drivers/gpio/gpio-ppc44x.c
@@ -158,13 +158,20 @@ static int ppc44x_gpio_probe(struct platform_device *ofdev)
 {
 	struct device *dev = &ofdev->dev;
 	struct device_node *np = dev->of_node;
+	struct ppc44x_gpio __iomem *regs;
 	struct ppc44x_gpio_chip *chip;
 	struct gpio_chip *gc;
 
+	regs = devm_platform_ioremap_resource(ofdev, 0);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
 	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
 	if (!chip)
 		return -ENOMEM;
 
+	chip->regs = regs;
+
 	spin_lock_init(&chip->lock);
 
 	gc = &chip->gc;
@@ -181,10 +188,6 @@ static int ppc44x_gpio_probe(struct platform_device *ofdev)
 	if (!gc->label)
 		return -ENOMEM;
 
-	chip->regs = devm_of_iomap(dev, np, 0, NULL);
-	if (IS_ERR(chip->regs))
-		return PTR_ERR(chip->regs);
-
 	return devm_gpiochip_add_data(dev, gc, chip);
 }
 
-- 
2.55.0