mfd: max8998: Add irq domain support

This patch adds irq domain support for max8998 interrupts.

To keep both non-DT and DT worlds happy, simple domain is used, which is
linear when no explicit IRQ base is specified and legacy, with static
mapping, otherwise.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/drivers/rtc/rtc-max8998.c b/drivers/rtc/rtc-max8998.c
index d5af7baa48b5..46f23014759b 100644
--- a/drivers/rtc/rtc-max8998.c
+++ b/drivers/rtc/rtc-max8998.c
@@ -16,6 +16,7 @@
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/bcd.h>
+#include <linux/irqdomain.h>
 #include <linux/rtc.h>
 #include <linux/platform_device.h>
 #include <linux/mfd/max8998.h>
@@ -264,7 +265,6 @@ static int max8998_rtc_probe(struct platform_device *pdev)
         info->dev = &pdev->dev;
         info->max8998 = max8998;
         info->rtc = max8998->rtc;
-        info->irq = max8998->irq_base + MAX8998_IRQ_ALARM0;
 
         platform_set_drvdata(pdev, info);
 
@@ -277,6 +277,15 @@ static int max8998_rtc_probe(struct platform_device *pdev)
                 goto out_rtc;
         }
 
+        if (!max8998->irq_domain)
+                goto no_irq;
+
+        info->irq = irq_create_mapping(max8998->irq_domain, MAX8998_IRQ_ALARM0);
+        if (!info->irq) {
+                dev_warn(&pdev->dev, "Failed to map alarm IRQ\n");
+                goto no_irq;
+        }
+
         ret = devm_request_threaded_irq(&pdev->dev, info->irq, NULL,
                                 max8998_rtc_alarm_irq, 0, "rtc-alarm0", info);
 
@@ -284,6 +293,7 @@ static int max8998_rtc_probe(struct platform_device *pdev)
                 dev_err(&pdev->dev, "Failed to request alarm IRQ: %d: %d\n",
                         info->irq, ret);
 
+no_irq:
         dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name);
         if (pdata && pdata->rtc_delay) {
                 info->lp3974_bug_workaround = true;