x86/rtc, mrst: Don't register a platform RTC device for for Intel MID platforms

Intel MID x86 platforms have a memory mapped virtual RTC
instead.  No MID platform have the default ports (and
accessing them may do weird stuff).

Signed-off-by: Mathias Nyman <[email protected]>
Signed-off-by: Alan Cox <[email protected]>
Cc: [email protected]
Cc: Feng Tang <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/arch/x86/include/asm/mrst.h b/arch/x86/include/asm/mrst.h
index e6283129c821014eba1afcbbb1bdd042b6b73e04..93f79094c2243211eede22db91acdf33098a059a 100644 (file)
--- a/arch/x86/include/asm/mrst.h
+++ b/arch/x86/include/asm/mrst.h
@@ -31,11 +31,20 @@ enum mrst_cpu_type {
 };
 
 extern enum mrst_cpu_type __mrst_cpu_chip;
+
+#ifdef CONFIG_X86_INTEL_MID
+
 static inline enum mrst_cpu_type mrst_identify_cpu(void)
 {
        return __mrst_cpu_chip;
 }
 
+#else /* !CONFIG_X86_INTEL_MID */
+
+#define mrst_identify_cpu()    (0)
+
+#endif /* !CONFIG_X86_INTEL_MID */
+
 enum mrst_timer_options {
        MRST_TIMER_DEFAULT,
        MRST_TIMER_APBT_ONLY,

diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index 348ce016a835c291deeae528fb327ea8f93ffbdb..af6db6ec5b2a20db3d13861bdb97b878f8371f1e 100644 (file)
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -12,6 +12,7 @@
 #include <asm/vsyscall.h>
 #include <asm/x86_init.h>
 #include <asm/time.h>
+#include <asm/mrst.h>
 
 #ifdef CONFIG_X86_32
 /*
@@ -242,6 +243,10 @@ static __init int add_rtc_cmos(void)
        if (of_have_populated_dt())
                return 0;
 
+       /* Intel MID platforms don't have ioport rtc */
+       if (mrst_identify_cpu())
+               return -ENODEV;
+
        platform_device_register(&rtc_device);
        dev_info(&rtc_device.dev,
                 "registered platform RTC device (no PNP device found)\n");