2 files changed, 4 insertions, 3 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 9a9755c92fad..8cb158d7744d 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -329,7 +329,7 @@ comment "Platform RTC drivers"
 
 config RTC_DRV_CMOS
         tristate "PC-style 'CMOS'"
-        depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS
+        depends on X86 || ALPHA || ARM || M32R || ATARI || PPC || MIPS || SPARC
         default y if X86
         help
           Say "yes" here to get direct support for the real time clock
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 6ea349aba3ba..04ecfd2e7c88 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -636,7 +636,7 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
          */
 #if     defined(CONFIG_ATARI)
         address_space = 64;
-#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__)
+#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) || defined(__sparc__)
         address_space = 128;
 #else
 #warning Assuming 128 bytes of RTC+NVRAM address space, not 64 bytes.
@@ -699,7 +699,8 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
         /* FIXME teach the alarm code how to handle binary mode;
          * <asm-generic/rtc.h> doesn't know 12-hour mode either.
          */
-        if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY))) {
+        if (is_valid_irq(rtc_irq) &&
+            (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY)))) {
                 dev_dbg(dev, "only 24-hr BCD mode supported\n");
                 retval = -ENXIO;
                 goto cleanup1;