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diff --git a/docs/porting-guide.md b/docs/porting-guide.md index 8dad4a05..195c9374 100644 --- a/docs/porting-guide.md +++ b/docs/porting-guide.md @@ -1832,6 +1832,20 @@ This function can also be used in case the platform wants to support local power state encoding for `power_state` parameter of PSCI_STAT_COUNT/RESIDENCY APIs as described in Section 5.18 of [PSCI]. +#### plat_psci_ops.get_node_hw_state() + +This is an optional function. If implemented this function is intended to return +the power state of a node (identified by the first parameter, the `MPIDR`) in +the power domain topology (identified by the second parameter, `power_level`), +as retrieved from a power controller or equivalent component on the platform. +Upon successful completion, the implementation must map and return the final +status among `HW_ON`, `HW_OFF` or `HW_STANDBY`. Upon encountering failures, it +must return either `PSCI_E_INVALID_PARAMS` or `PSCI_E_NOT_SUPPORTED` as +appropriate. + +Implementations are not expected to handle `power_levels` greater than +`PLAT_MAX_PWR_LVL`. + 3.6 Interrupt Management framework (in BL31) ---------------------------------------------- BL31 implements an Interrupt Management Framework (IMF) to manage interrupts |