x86/platform/intel/pmc_atom: Export accessors to PMC registers
Export the pmc_atom_read() and pmc_atom_write() accessors to the PMC registers. On early initcall stages the functions will return -ENODEV, and caller has to wait when it will be available. Additionally make absence of debugfs a non-fatal error. The patch will be useful for the upcoming fixes regarding to the LPSS block found on Intel BayTrail-T and Braswell. Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: Aubrey Li <aubrey.li@linux.intel.com> Cc: Kumar P Mahesh <mahesh.kumar.p@intel.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rafael J . Wysocki <rafael.j.wysocki@intel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1436192944-56496-2-git-send-email-andriy.shevchenko@linux.intel.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
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