powerpc/microwatt: Define an idle power-save function
This uses the 'wait' instruction to pause instruction execution when idle until an interrupt occurs. Signed-off-by:Paul Mackerras <paulus@ozlabs.org> Signed-off-by:
Madhavan Srinivasan <maddy@linux.ibm.com> Link: https://patch.msgid.link/Z5xtl1m_Gqc-HLjY@thinks.paulus.ozlabs.org
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