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Prior to Tiger Lake, the platforms that support pmc_core have no sub-states of S0ix. Tiger Lake has 8 sub-states/low power modes of S0ix ranging from S0i2.0-S0i2.2 and S0i3.0-S0i3.4, simply represented as S0ix.y. Create a debugfs entry to access residency of each sub-state. Cc: Srinivas Pandruvada <srinivas.pandruvada@intel.com> Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Cc: David Box <david.e.box@intel.com> Signed-off-by: David Box <david.e.box@intel.com> Signed-off-by: Gayatri Kammela <gayatri.kammela@intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>