[PATCH v2 13/15] x86/rtc: don't register rtc if we the DT blob

[Sebastian Andrzej Siewior <bigeasy@linutronix.de>]

or we might end up with two device nodes for the same hardware.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 arch/x86/kernel/rtc.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index 1cfbbfc..0cfa138 100644
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -6,6 +6,7 @@
 #include <linux/acpi.h>
 #include <linux/bcd.h>
 #include <linux/pnp.h>
+#include <linux/of.h>
 
 #include <asm/vsyscall.h>
 #include <asm/x86_init.h>
@@ -218,6 +219,20 @@ static struct platform_device rtc_device = {
 	.num_resources	= ARRAY_SIZE(rtc_resources),
 };
 
+#ifdef CONFIG_OF
+static __init int have_DTB(void)
+{
+	if (initial_boot_params)
+		return 1;
+	return 0;
+}
+#else
+static inline int have_DTB(void)
+{
+	return 0;
+}
+#endif
+
 static __init int add_rtc_cmos(void)
 {
 #ifdef CONFIG_PNP
@@ -237,6 +252,9 @@ static __init int add_rtc_cmos(void)
 	}
 #endif
 
+	if (have_DTB())
+		return 0;
+
 	platform_device_register(&rtc_device);
 	dev_info(&rtc_device.dev,
 		 "registered platform RTC device (no PNP device found)\n");
-- 
1.7.3.2