rtc: s5m: query platform device IRQ resource for alarm IRQ

The core driver now exposes the alarm IRQ as a resource, so we can drop
the lookup from here to simplify the code and make adding support for
additional variants easier in this driver.

Signed-off-by: André Draszik <[e-mail]>
Acked-by: Alexandre Belloni <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Lee Jones <[e-mail]>

drivers/rtc/rtc-s5m.c

···
 #include <linux/rtc.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/samsung/core.h>
-#include <linux/mfd/samsung/irq.h>
 #include <linux/mfd/samsung/rtc.h>
 #include <linux/mfd/samsung/s2mps14.h>
 
···
 		case S2MPS15X:
 			regmap_cfg = &s2mps14_rtc_regmap_config;
 			info->regs = &s2mps15_rtc_regs;
-			alarm_irq = S2MPS14_IRQ_RTCA0;
 			break;
 		case S2MPS14X:
 			regmap_cfg = &s2mps14_rtc_regmap_config;
 			info->regs = &s2mps14_rtc_regs;
-			alarm_irq = S2MPS14_IRQ_RTCA0;
 			break;
 		case S2MPS13X:
 			regmap_cfg = &s2mps14_rtc_regmap_config;
 			info->regs = &s2mps13_rtc_regs;
-			alarm_irq = S2MPS14_IRQ_RTCA0;
 			break;
 		case S5M8767X:
 			regmap_cfg = &s5m_rtc_regmap_config;
 			info->regs = &s5m_rtc_regs;
-			alarm_irq = S5M8767_IRQ_RTCA1;
 			break;
 		default:
 			return dev_err_probe(&pdev->dev, -ENODEV,
···
 					     "Failed to allocate regmap\n");
 	} else if (device_type == S2MPG10) {
 		info->regs = &s2mpg10_rtc_regs;
-		alarm_irq = S2MPG10_IRQ_RTCA0;
 	} else {
 		return dev_err_probe(&pdev->dev, -ENODEV,
 				     "Unsupported device type %d\n",
···
 	info->s5m87xx = s5m87xx;
 	info->device_type = device_type;
 
-	if (s5m87xx->irq_data) {
-		info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
-		if (info->irq <= 0)
-			return dev_err_probe(&pdev->dev, -EINVAL,
-					     "Failed to get virtual IRQ %d\n",
-					     alarm_irq);
-	}
+	alarm_irq = platform_get_irq_byname_optional(pdev, "alarm");
+	if (alarm_irq > 0)
+		info->irq = alarm_irq;
+	else if (alarm_irq == -ENXIO)
+		info->irq = 0;
+	else
+		return dev_err_probe(&pdev->dev, alarm_irq ? : -EINVAL,
+				     "IRQ 'alarm' not found\n");
 
 	platform_set_drvdata(pdev, info);