rtc: sa1100: prepare to share sa1100_rtc_ops

Factor out the RTC initialization from the platform device specific
parts in order to share the RTC device ops with other drivers.
Specifically, it will be shared with rtc-pxa driver.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: rtc-linux@googlegroups.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

2 files changed, 49 insertions, 29 deletions

diff --git a/drivers/rtc/rtc-sa1100.c b/drivers/rtc/rtc-sa1100.c
index b6e1ca08c2c0..abc19abd5f2d 100644
--- a/drivers/rtc/rtc-sa1100.c
+++ b/drivers/rtc/rtc-sa1100.c
@@ -42,17 +42,12 @@
 #include <mach/regs-rtc.h>
 #endif
 
+#include "rtc-sa1100.h"
+
 #define RTC_DEF_DIVIDER         (32768 - 1)
 #define RTC_DEF_TRIM            0
 #define RTC_FREQ                1024
 
-struct sa1100_rtc {
-        spinlock_t              lock;
-        int                     irq_1hz;
-        int                     irq_alarm;
-        struct rtc_device       *rtc;
-        struct clk              *clk;
-};
 
 static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
 {
@@ -223,29 +218,18 @@ static const struct rtc_class_ops sa1100_rtc_ops = {
         .alarm_irq_enable = sa1100_rtc_alarm_irq_enable,
 };
 
-static int sa1100_rtc_probe(struct platform_device *pdev)
+int sa1100_rtc_init(struct platform_device *pdev, struct sa1100_rtc *info)
 {
         struct rtc_device *rtc;
-        struct sa1100_rtc *info;
-        int irq_1hz, irq_alarm, ret = 0;
+        int ret;
 
-        irq_1hz = platform_get_irq_byname(pdev, "rtc 1Hz");
-        irq_alarm = platform_get_irq_byname(pdev, "rtc alarm");
-        if (irq_1hz < 0 || irq_alarm < 0)
-                return -ENODEV;
+        spin_lock_init(&info->lock);
 
-        info = devm_kzalloc(&pdev->dev, sizeof(struct sa1100_rtc), GFP_KERNEL);
-        if (!info)
-                return -ENOMEM;
         info->clk = devm_clk_get(&pdev->dev, NULL);
         if (IS_ERR(info->clk)) {
                 dev_err(&pdev->dev, "failed to find rtc clock source\n");
                 return PTR_ERR(info->clk);
         }
-        info->irq_1hz = irq_1hz;
-        info->irq_alarm = irq_alarm;
-        spin_lock_init(&info->lock);
-        platform_set_drvdata(pdev, info);
 
         ret = clk_prepare_enable(info->clk);
         if (ret)
@@ -265,14 +249,11 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
                 RCNR = 0;
         }
 
-        device_init_wakeup(&pdev->dev, 1);
-
         rtc = devm_rtc_device_register(&pdev->dev, pdev->name, &sa1100_rtc_ops,
                                         THIS_MODULE);
-
         if (IS_ERR(rtc)) {
-                ret = PTR_ERR(rtc);
-                goto err_dev;
+                clk_disable_unprepare(info->clk);
+                return PTR_ERR(rtc);
         }
         info->rtc = rtc;
 
@@ -301,9 +282,29 @@ static int sa1100_rtc_probe(struct platform_device *pdev)
         RTSR = RTSR_AL | RTSR_HZ;
 
         return 0;
-err_dev:
-        clk_disable_unprepare(info->clk);
-        return ret;
+}
+EXPORT_SYMBOL_GPL(sa1100_rtc_init);
+
+static int sa1100_rtc_probe(struct platform_device *pdev)
+{
+        struct sa1100_rtc *info;
+        int irq_1hz, irq_alarm;
+
+        irq_1hz = platform_get_irq_byname(pdev, "rtc 1Hz");
+        irq_alarm = platform_get_irq_byname(pdev, "rtc alarm");
+        if (irq_1hz < 0 || irq_alarm < 0)
+                return -ENODEV;
+
+        info = devm_kzalloc(&pdev->dev, sizeof(struct sa1100_rtc), GFP_KERNEL);
+        if (!info)
+                return -ENOMEM;
+        info->irq_1hz = irq_1hz;
+        info->irq_alarm = irq_alarm;
+
+        platform_set_drvdata(pdev, info);
+        device_init_wakeup(&pdev->dev, 1);
+
+        return sa1100_rtc_init(pdev, info);
 }
 
 static int sa1100_rtc_remove(struct platform_device *pdev)
diff --git a/drivers/rtc/rtc-sa1100.h b/drivers/rtc/rtc-sa1100.h
new file mode 100644
index 000000000000..665d054740a1
--- /dev/null
+++ b/drivers/rtc/rtc-sa1100.h
@@ -0,0 +1,19 @@
+#ifndef __RTC_SA1100_H__
+#define __RTC_SA1100_H__
+
+#include <linux/kernel.h>
+
+struct clk;
+struct platform_device;
+
+struct sa1100_rtc {
+        spinlock_t              lock;
+        int                     irq_1hz;
+        int                     irq_alarm;
+        struct rtc_device       *rtc;
+        struct clk              *clk;
+};
+
+int sa1100_rtc_init(struct platform_device *pdev, struct sa1100_rtc *info);
+
+#endif