[PATCH] spi: spi-mpc52xx: use platform_get_irq_optional for IRQ lookup

[Rosen Penev <rosenp@gmail.com>]

Replace irq_of_parse_and_map() calls with platform_get_irq_optional()
to fetch both IRQs in the probe function. This is a more portable
approach that works with both DT and non-DT platforms and follows
modern platform API conventions.

The -EPROBE_DEFER case is handled properly so deferred probe works
as expected, and invalid IRQ numbers are normalized to 0.

Signed-off-by: Rosen Penev <rosenp@gmail.com>
---
 drivers/spi/spi-mpc52xx.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-mpc52xx.c b/drivers/spi/spi-mpc52xx.c
index 70d8e17e8c43..563b1f627be9 100644
--- a/drivers/spi/spi-mpc52xx.c
+++ b/drivers/spi/spi-mpc52xx.c
@@ -392,6 +392,18 @@ static int mpc52xx_spi_probe(struct platform_device *op)
 	void __iomem *regs;
 	u8 ctrl1;
 	int rc, i = 0;
+	int irq0;
+	int irq1;
+
+	irq0 = platform_get_irq_optional(op, 0);
+	if (irq0 == -EPROBE_DEFER)
+		return irq0;
+	irq0 = max(irq0, 0);
+
+	irq1 = platform_get_irq_optional(op, 1);
+	if (irq1 == -EPROBE_DEFER)
+		return irq1;
+	irq1 = max(irq1, 0);
 
 	/* MMIO registers */
 	dev_dbg(&op->dev, "probing mpc5200 SPI device\n");
@@ -436,8 +448,8 @@ static int mpc52xx_spi_probe(struct platform_device *op)
 	ms = spi_controller_get_devdata(host);
 	ms->host = host;
 	ms->regs = regs;
-	ms->irq0 = irq_of_parse_and_map(op->dev.of_node, 0);
-	ms->irq1 = irq_of_parse_and_map(op->dev.of_node, 1);
+	ms->irq0 = irq0;
+	ms->irq1 = irq1;
 	ms->state = mpc52xx_spi_fsmstate_idle;
 	ms->ipb_freq = mpc5xxx_get_bus_frequency(&op->dev);
 	ms->gpio_cs_count = gpiod_count(&op->dev, NULL);
-- 
2.55.0