Merging upstream version 6.8.9.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 77 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/cpu/idle-states.yaml b/Documentation/devicetree/bindings/cpu/idle-states.yaml
index b3a5356f99..239480ef7c 100644
--- a/Documentation/devicetree/bindings/cpu/idle-states.yaml
+++ b/Documentation/devicetree/bindings/cpu/idle-states.yaml
@@ -243,7 +243,64 @@ description: |+
   just supports idle_standby, an idle-states node is not required.
 
   ===========================================
-  6 - References
+  6 - Qualcomm specific STATES
+  ===========================================
+
+  Idle states have different enter/exit latency and residency values.
+  The idle states supported by the QCOM SoC are defined as -
+
+    * Standby
+    * Retention
+    * Standalone Power Collapse (Standalone PC or SPC)
+    * Power Collapse (PC)
+
+  Standby: Standby does a little more in addition to architectural clock gating.
+  When the WFI instruction is executed the ARM core would gate its internal
+  clocks. In addition to gating the clocks, QCOM cpus use this instruction as a
+  trigger to execute the SPM state machine. The SPM state machine waits for the
+  interrupt to trigger the core back in to active. This triggers the cache
+  hierarchy to enter standby states, when all cpus are idle. An interrupt brings
+  the SPM state machine out of its wait, the next step is to ensure that the
+  cache hierarchy is also out of standby, and then the cpu is allowed to resume
+  execution. This state is defined as a generic ARM WFI state by the ARM cpuidle
+  driver and is not defined in the DT. The SPM state machine should be
+  configured to execute this state by default and after executing every other
+  state below.
+
+  Retention: Retention is a low power state where the core is clock gated and
+  the memory and the registers associated with the core are retained. The
+  voltage may be reduced to the minimum value needed to keep the processor
+  registers active. The SPM should be configured to execute the retention
+  sequence and would wait for interrupt, before restoring the cpu to execution
+  state. Retention may have a slightly higher latency than Standby.
+
+  Standalone PC: A cpu can power down and warmboot if there is a sufficient time
+  between the time it enters idle and the next known wake up. SPC mode is used
+  to indicate a core entering a power down state without consulting any other
+  cpu or the system resources. This helps save power only on that core.  The SPM
+  sequence for this idle state is programmed to power down the supply to the
+  core, wait for the interrupt, restore power to the core, and ensure the
+  system state including cache hierarchy is ready before allowing core to
+  resume. Applying power and resetting the core causes the core to warmboot
+  back into Elevation Level (EL) which trampolines the control back to the
+  kernel. Entering a power down state for the cpu, needs to be done by trapping
+  into a EL. Failing to do so, would result in a crash enforced by the warm boot
+  code in the EL for the SoC. On SoCs with write-back L1 cache, the cache has to
+  be flushed in s/w, before powering down the core.
+
+  Power Collapse: This state is similar to the SPC mode, but distinguishes
+  itself in that the cpu acknowledges and permits the SoC to enter deeper sleep
+  modes. In a hierarchical power domain SoC, this means L2 and other caches can
+  be flushed, system bus, clocks - lowered, and SoC main XO clock gated and
+  voltages reduced, provided all cpus enter this state.  Since the span of low
+  power modes possible at this state is vast, the exit latency and the residency
+  of this low power mode would be considered high even though at a cpu level,
+  this essentially is cpu power down. The SPM in this state also may handshake
+  with the Resource power manager (RPM) processor in the SoC to indicate a
+  complete application processor subsystem shut down.
+
+  ===========================================
+  7 - References
   ===========================================
 
   [1] ARM Linux Kernel documentation - CPUs bindings
@@ -301,9 +358,16 @@ patternProperties:
 
     properties:
       compatible:
-        enum:
-          - arm,idle-state
-          - riscv,idle-state
+        oneOf:
+          - items:
+              - enum:
+                  - qcom,idle-state-ret
+                  - qcom,idle-state-spc
+                  - qcom,idle-state-pc
+              - const: arm,idle-state
+          - enum:
+              - arm,idle-state
+              - riscv,idle-state
 
       arm,psci-suspend-param:
         $ref: /schemas/types.yaml#/definitions/uint32
@@ -852,4 +916,13 @@ examples:
         };
     };
 
+    // Example 4 - Qualcomm SPC
+    idle-states {
+      cpu_spc: cpu-spc {
+        compatible = "qcom,idle-state-spc", "arm,idle-state";
+        entry-latency-us = <150>;
+        exit-latency-us = <200>;
+        min-residency-us = <2000>;
+      };
+    };
 ...