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powerpc/powernv: Check OPAL RTC calls exists before using
authorMichael Neuling <mikey@neuling.org>
Tue, 19 Aug 2014 04:48:00 +0000 (14:48 +1000)
committerMichael Ellerman <mpe@ellerman.id.au>
Thu, 25 Sep 2014 13:14:35 +0000 (23:14 +1000)
Check that the OPAL_RTC_READ token exists before we use the OPAL RTC.

Refactors the code a little to merge error paths.

This avoids littering the OPAL console with:
  "OPAL: Called with bad token 3".

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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