doc: update DMIC and WoV architecture Mermaid diagrams across all READMEs

Synchronize Mermaid architecture diagrams to reflect direct widget routing:
- Add dedicated Dual-Rate DMIC & Multi-Slot WoV flowchart to tools/topology/topology2/README.md.
- Update src/audio/ecns/README.md, src/audio/wov_arbiter/README.md, and
  doc/developer_guides/wov_ecns_integration_guide.md to eliminate intermediate
  mixin.115.1/mixin.115.2 and mixout.116.1/mixout.117.1 widgets.
- Update src/audio/microwakeword/README.md to eliminate intermediate
  mixin.105.1/mixin.105.2 and mixout.106.1/mixout.107.1 widgets.
- Show direct ECNS Pin 0 connection to KPB and ECNS Pin 1 connection
  to Host Copier (PCM 11 / PCM 10).

Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>

Author: lrgirdwo

doc/developer_guides/wov_ecns_integration_guide.md

@@ -60,38 +60,27 @@ flowchart TD
 
         ECNS["ecns.115.1 (Custom ECNS DP Module · 20ms Period)<br/>━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━<br/><b>Pin 0 In:</b> 16 kHz, 2ch (IBS 1280 bytes)<br/><b>Pin 1 In:</b> 48 kHz, 2ch (IBS 3840 bytes)<br/>─────────────────────────────────<br/><b>Processing:</b><br/>• Pin 0: Extract Left Ch → 16k Mono Clean<br/>• Pin 1: 1-to-1 Stereo Copy → 48k Stereo Clean<br/>─────────────────────────────────<br/><b>Pin 0 Out:</b> 16 kHz, 1ch mono (OBS 640 bytes)<br/><b>Pin 1 Out:</b> 48 kHz, 2ch stereo (OBS 3840 bytes)"]
 
-        MIXIN_115_1["mixin.115.1 ('KPB mixin')<br/>(16 kHz · 1ch mono)"]
-        MIXIN_115_2["mixin.115.2 ('Host mixin')<br/>(48 kHz · 2ch stereo)"]
-
         MIXOUT_115_2 -->|"Pin 0 In (16k)"| ECNS
         MIXOUT_115_1 -->|"Pin 1 In (48k)"| ECNS
-
-        ECNS -->|"Pin 0 Out (Mono clean)"| MIXIN_115_1
-        ECNS -->|"Pin 1 Out (Stereo clean)"| MIXIN_115_2
     end
 
     MIXIN_119 --> MIXOUT_115_2
     MIXIN_110 --> MIXOUT_115_1
 
     %% Pipeline 117: Host Capture PCM 11
     subgraph P117 ["Pipeline 117: ECNS Clean Host Capture (Core 0, LL 1ms)"]
-        MIXOUT_117["mixout.117.1<br/>(48 kHz · 2ch stereo)"]
         HOST_11["host-copier.11.capture<br/>(PCM 11: hw:0,11)<br/>2ch Stereo Clean Speech<br/>capture_compatible_d0i3: true"]
-        MIXOUT_117 --> HOST_11
     end
 
-    MIXIN_115_2 --> MIXOUT_117
-
     %% Pipeline 116: KPB History Buffer
     subgraph P116 ["Pipeline 116: KPB History Buffer (Core 0, DP 20ms)"]
-        MIXOUT_116["mixout.116.1<br/>(16 kHz · 1ch mono)"]
         KPB["kpb.116.1<br/>(2.0s mono circular history = 64 KB)"]
         MIXIN_116["mixin.116.1<br/>(Fan-out Bus)"]
-        MIXOUT_116 --> KPB
         KPB -->|"Pin 0 (Live Feed)"| MIXIN_116
     end
 
-    MIXIN_115_1 --> MIXOUT_116
+    ECNS -->|"Pin 1 (Stereo 48k clean direct)"| HOST_11
+    ECNS -->|"Pin 0 (Mono 16k clean direct)"| KPB
 
     %% WOV Keyword Spotter Slots
     subgraph WOV_Slots ["Pipelines 111–113: Concurrent WOV Keyword Spotters (Core 0, DP 10ms)"]

src/audio/ecns/README.md

@@ -51,38 +51,27 @@ flowchart TD
 
         ECNS["ecns.115.1 (DP Component · 20ms Period)<br/>━━━━━━━━━━━━━━━━━━━━━━━━━━━━━<br/><b>Pin 0 In:</b> 16 kHz, 2ch (IBS 1280 bytes)<br/><b>Pin 1 In:</b> 48 kHz, 2ch (IBS 3840 bytes)<br/>─────────────────────────────<br/><b>Processing:</b><br/>• Pin 0: Extract Left Ch → 16k Mono Clean<br/>• Pin 1: 1-to-1 Stereo Copy → 48k Stereo Clean<br/>─────────────────────────────<br/><b>Pin 0 Out:</b> 16 kHz, 1ch mono (OBS 640 bytes)<br/><b>Pin 1 Out:</b> 48 kHz, 2ch stereo (OBS 3840 bytes)"]
 
-        MIXIN_115_1["mixin.115.1 ('KPB mixin')<br/>(16 kHz · 1ch mono)"]
-        MIXIN_115_2["mixin.115.2 ('Host mixin')<br/>(48 kHz · 2ch stereo)"]
-
         MIXOUT_115_2 -->|"Pin 0 In (16k)"| ECNS
         MIXOUT_115_1 -->|"Pin 1 In (48k)"| ECNS
-
-        ECNS -->|"Pin 0 Out (Mono clean)"| MIXIN_115_1
-        ECNS -->|"Pin 1 Out (Stereo clean)"| MIXIN_115_2
     end
 
     MIXIN_119 --> MIXOUT_115_2
     MIXIN_110 --> MIXOUT_115_1
 
     %% Pipeline 117: Host Capture PCM 11
     subgraph P117 ["Pipeline 117: ECNS Clean Host Capture (Core 0, LL 1ms)"]
-        MIXOUT_117["mixout.117.1<br/>(48 kHz · 2ch stereo)"]
         HOST_11["host-copier.11.capture<br/>(PCM 11: 'DMIC ECNS Capture'<br/>hw:0,11 · d0i3_compatible=true)"]
-        MIXOUT_117 --> HOST_11
     end
 
-    MIXIN_115_2 --> MIXOUT_117
-
     %% Pipeline 116: KPB History Buffer
     subgraph P116 ["Pipeline 116: Key Phrase Buffer (Core 0, DP 20ms)"]
-        MIXOUT_116["mixout.116.1<br/>(16 kHz · 1ch mono)"]
         KPB["kpb.116.1<br/>(2000 ms mono history = 64 KB)"]
         MIXIN_116["mixin.116.1<br/>(3-way detector fanout)"]
-        MIXOUT_116 --> KPB
         KPB -->|"Pin 0 (Live Feed)"| MIXIN_116
     end
 
-    MIXIN_115_1 --> MIXOUT_116
+    ECNS -->|"Pin 1 Out (Stereo 48k clean direct)"| HOST_11
+    ECNS -->|"Pin 0 Out (Mono 16k clean direct)"| KPB
 
     %% WoV 3-Slot Detector Subgraph
     subgraph SLOTS ["Wake-on-Voice Keyword Detector Slots (16 kHz mono)"]

src/audio/microwakeword/README.md

@@ -31,18 +31,13 @@ graph TD
     subgraph P105["Pipeline 105 — ECNS DP Processing  (Core 0, DP 20ms)"]
         MO105["mixout 105.1\n(4ch input)"]
         ECNS["ecns.105.1\n(ECNS DP Module, 20ms = 320 frames)\nCh 0,1: Mic | Ch 2,3: Echo Ref"]
-        MIX105_1["mixin 105.1\nPin 0: Ch 0 Mono Clean"]
-        MIX105_2["mixin 105.2\nPin 1: Ch 0,1 Stereo Clean"]
         MO105 --> ECNS
-        ECNS -- "Pin 0 (Mono)" --> MIX105_1
-        ECNS -- "Pin 1 (Stereo)" --> MIX105_2
     end
 
     subgraph P106["Pipeline 106 — KPB History Buffer  (Core 0, DP 20ms)"]
-        MO106["mixout 106.1\n(1ch mono)"]
-        KPB["kpb.106.1\n(2.0s mono history = 64 KB)\n16 kHz · 1ch · S16_LE"]
+        KPB["kpb.106.1\n(2.0s mono history = 64 KB)\n16 kHz · 1ch · S16_LE\nPin 0: sel_sink | Pin 1: host_sink"]
         MIX106["mixin 106.1\n(3-way fanout mixin)"]
-        MO106 --> KPB --> MIX106
+        KPB -- "Pin 0 (sel_sink)" --> MIX106
     end
 
     subgraph P101["Pipeline 101 — Slot 0: 'strawberry'  (Core 0, DP 10ms)"]
@@ -67,27 +62,26 @@ graph TD
     end
 
     subgraph P104["Pipeline 104 — WOV Host PCM Capture  (Core 0, LL 1ms)"]
-        ARB["wov-arbiter.104.1\n(3 input pins, 1 output pin\n1ch mono 16 kHz)"]
+        ARB["wov-arbiter.104.1\n(4 input pins, 1 output pin\nPin 0: Audio | Pins 1-3: Features\n1ch mono 16 kHz S16_LE)"]
         HC11["host-copier.11\n(hw:0,11 · PCM 11)\n1ch · 16 kHz · S16_LE / S32_LE"]
         ARB --> HC11
     end
 
     subgraph P107["Pipeline 107 — ECNS Host PCM Capture  (Core 0, LL 1ms)"]
-        MO107["mixout 107.1\n(2ch stereo)"]
         HC10["host-copier.10\n(hw:0,10 · PCM 10)\n2ch · 16 kHz · S16_LE / S32_LE"]
-        MO107 --> HC10
     end
 
     MIX100 --> MO105
-    MIX105_1 --> MO106
-    MIX105_2 --> MO107
+    ECNS -- "Pin 0 (Mono Clean direct)" --> KPB
+    ECNS -- "Pin 1 (Stereo Clean direct)" --> HC10
     MIX106 --> MO101
     MIX106 --> MO102
     MIX106 --> MO103
 
-    MWW0 --> ARB
-    MWW1 --> ARB
-    MWW2 --> ARB
+    KPB -- "Pin 1 (host_sink / drain audio)" --> ARB
+    MWW0 -->|"Pin 1 (Features)"| ARB
+    MWW1 -->|"Pin 2 (Features)"| ARB
+    MWW2 -->|"Pin 3 (Features)"| ARB
 
     MWW0 -. "Notifier WOV_DETECT (slot=0)" .-> ARB
     MWW1 -. "Notifier WOV_DETECT (slot=1)" .-> ARB

src/audio/wov_arbiter/README.md

@@ -80,38 +80,27 @@ flowchart TD
 
         ECNS["ecns.115.1 (DP Component · 20ms Period)<br/>━━━━━━━━━━━━━━━━━━━━━━━━━━━━━<br/><b>Pin 0 In:</b> 16 kHz, 2ch (IBS 1280 bytes)<br/><b>Pin 1 In:</b> 48 kHz, 2ch (IBS 3840 bytes)<br/>─────────────────────────────<br/><b>Processing:</b><br/>• Pin 0: Extract Left Ch → 16k Mono Clean<br/>• Pin 1: 1-to-1 Stereo Copy → 48k Stereo Clean<br/>─────────────────────────────<br/><b>Pin 0 Out:</b> 16 kHz, 1ch mono (OBS 640 bytes)<br/><b>Pin 1 Out:</b> 48 kHz, 2ch stereo (OBS 3840 bytes)"]
 
-        MIXIN_115_1["mixin.115.1 ('KPB mixin')<br/>(16 kHz · 1ch mono)"]
-        MIXIN_115_2["mixin.115.2 ('Host mixin')<br/>(48 kHz · 2ch stereo)"]
-
         MIXOUT_115_2 -->|"Pin 0 In (16k)"| ECNS
         MIXOUT_115_1 -->|"Pin 1 In (48k)"| ECNS
-
-        ECNS -->|"Pin 0 Out (Mono clean)"| MIXIN_115_1
-        ECNS -->|"Pin 1 Out (Stereo clean)"| MIXIN_115_2
     end
 
     MIXIN_119 --> MIXOUT_115_2
     MIXIN_110 --> MIXOUT_115_1
 
     %% Pipeline 117: Host Capture PCM 11
     subgraph P117 ["Pipeline 117: ECNS Clean Host Capture (Core 0, LL 1ms)"]
-        MIXOUT_117["mixout.117.1<br/>(48 kHz · 2ch stereo)"]
         HOST_11["host-copier.11.capture<br/>(PCM 11: 'DMIC ECNS Capture'<br/>hw:0,11 · d0i3_compatible=true)"]
-        MIXOUT_117 --> HOST_11
     end
 
-    MIXIN_115_2 --> MIXOUT_117
-
     %% Pipeline 116: KPB History Buffer
     subgraph P116 ["Pipeline 116: Key Phrase Buffer (Core 0, DP 20ms)"]
-        MIXOUT_116["mixout.116.1<br/>(16 kHz · 1ch mono)"]
         KPB["kpb.116.1<br/>(2000 ms mono history = 64 KB)"]
         MIXIN_116["mixin.116.1<br/>(3-way detector fanout)"]
-        MIXOUT_116 --> KPB
         KPB -->|"Pin 0 (Live Feed)"| MIXIN_116
     end
 
-    MIXIN_115_1 --> MIXOUT_116
+    ECNS -->|"Pin 1 Out (Stereo 48k clean direct)"| HOST_11
+    ECNS -->|"Pin 0 Out (Mono 16k clean direct)"| KPB
 
     %% WoV 3-Slot Detector Subgraph
     subgraph SLOTS ["Wake-on-Voice Keyword Detector Slots (16 kHz mono)"]

tools/topology/topology2/README.md

@@ -619,6 +619,110 @@ The **`sof-wcl-rt721-4ch-wov-multi.tplg`** (and corresponding PTL variant `sof-p
   - 4-pin WOV Arbiter (`wov-arbiter.114.1`, Pipeline 114) with active slot selection, host wake support, and audio history stream delivery (`PCM 12`, `DMIC Multi-WOV`, 1ch 16 kHz, `capture_compatible_d0i3: true`).
   - *Note*: DMIC raw `PCM 10` (Pipeline 118) has been completely removed to streamline pipeline topology and conserve DSP memory.
 
+#### Dual-Rate DMIC & Multi-Slot WoV Architecture Diagram
+
+The flowchart below details the dedicated dual-rate DMIC capture, 20ms DP ECNS audio processing, KPB circular buffering, 3-slot microWakeWord keyword detection, and WOV Arbiter routing directly to ALSA capture endpoints without intermediate mixin/mixout widgets:
+
+```mermaid
+flowchart TD
+    %% Hardware Digital Microphone Interfaces
+    subgraph PDM_INTERFACES["Digital Microphone Interfaces (2 Separate PDM DAIs)"]
+        direction LR
+        PDM0["PDM Interface: dmic01\nDAI Index: 0 (PDM0)\nRate: 48 kHz · 2ch Stereo · 16-bit"]
+        PDM1["PDM Interface: dmic16k\nDAI Index: 1 (PDM1)\nRate: 16 kHz · 2ch Stereo · 16-bit"]
+    end
+
+    %% Pipeline 110: 48 kHz DAI Ingest
+    subgraph P110["Pipeline 110 — 48 kHz DAI Ingest (Core 0, LL 1ms)"]
+        DAI0["dai-copier.DMIC.dmic01.capture\n(48 kHz · 2ch · S16_LE)"]
+        MIX110["mixin.110.1\n(48 kHz · 2ch)"]
+        DAI0 --> MIX110
+    end
+
+    %% Pipeline 119: 16 kHz DAI Ingest
+    subgraph P119["Pipeline 119 — 16 kHz DAI Ingest (Core 0, LL 1ms)"]
+        DAI1["dai-copier.DMIC.dmic16k.capture\n(16 kHz · 2ch · S16_LE)"]
+        MIX119["mixin.119.1\n(16 kHz · 2ch)"]
+        DAI1 --> MIX119
+    end
+
+    PDM0 --> DAI0
+    PDM1 --> DAI1
+
+    %% Pipeline 115: Dual-Rate ECNS DP Engine
+    subgraph P115["Pipeline 115 — ECNS Processing Engine (Core 0, DP 20ms, lp_mode 1)"]
+        direction TB
+        MO115_1["mixout.115.1\n(Pin 1 In: 48 kHz · 2ch stereo)"]
+        MO115_2["mixout.115.2\n(Pin 0 In: 16 kHz · 2ch stereo)"]
+        ECNS["ecns.115.1 (Dual-Rate DP Module · 20ms Period)\n━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\nPin 0 In: 16 kHz, 2ch (IBS 1280B)\nPin 1 In: 48 kHz, 2ch (IBS 3840B)\n─────────────────────────────────────────\nProcessing:\n• Pin 0: Extract Left Ch -> 16k Mono Clean\n• Pin 1: 1-to-1 Stereo Copy -> 48k Stereo Clean\n─────────────────────────────────────────\nPin 0 Out: 16 kHz, 1ch mono (OBS 640B)\nPin 1 Out: 48 kHz, 2ch stereo (OBS 3840B)"]
+        MO115_2 -->|"Pin 0 In (16k 2ch)"| ECNS
+        MO115_1 -->|"Pin 1 In (48k 2ch)"| ECNS
+    end
+
+    MIX119 --> MO115_2
+    MIX110 --> MO115_1
+
+    %% Pipeline 117: Host Capture PCM 11 (Direct from ECNS Pin 1)
+    subgraph P117["Pipeline 117 — ECNS Clean Host Capture (Core 0, LL 1ms)"]
+        HOST11["host-copier.11.capture\n(PCM 11: 'DMIC ECNS Capture' · hw:0,11)\n2ch · 48 kHz · S16/S32_LE\ncapture_compatible_d0i3: true"]
+    end
+
+    %% Pipeline 116: KPB History Buffer (Direct from ECNS Pin 0)
+    subgraph P116["Pipeline 116 — 20ms DP KPB History Buffer (Core 0, DP 20ms)"]
+        KPB["kpb.116.1\n(Key Phrase Buffer · 2000ms = 64 KB)\n16 kHz · 1ch mono · S16_LE\nPin 0: sel_sink | Pin 1: host_sink"]
+        MIX116["mixin.116.1\n(3-way detector fanout bus)"]
+        KPB -->|"Pin 0 (Live Audio Feed)"| MIX116
+    end
+
+    ECNS -- "Pin 1 (Direct Stereo 48k Clean)" --> HOST11
+    ECNS -- "Pin 0 (Direct Mono 16k Clean)" --> KPB
+
+    %% Pipelines 111-113: microWakeWord Detector Slots
+    subgraph SLOTS["Pipelines 111–113 — microWakeWord Detector Slots (Core 0, DP 10ms)"]
+        subgraph S0["Slot 0 (Pipeline 111)"]
+            MO111["mixout.111.1"] --> MFCC0["mfcc.111.1\n(Mel-40 10ms)"] --> MWW0["mww.111.1\n(Model: Slot 0)\nControl: wovdebug_111"]
+        end
+        subgraph S1["Slot 1 (Pipeline 112)"]
+            MO112["mixout.112.1"] --> MFCC1["mfcc.112.1\n(Mel-40 10ms)"] --> MWW1["mww.112.1\n(Model: Slot 1)\nControl: wovdebug_112"]
+        end
+        subgraph S2["Slot 2 (Pipeline 113)"]
+            MO113["mixout.113.1"] --> MFCC2["mfcc.113.1\n(Mel-40 10ms)"] --> MWW2["mww.113.1\n(Model: Slot 2)\nControl: wovdebug_113"]
+        end
+    end
+
+    MIX116 --> MO111
+    MIX116 --> MO112
+    MIX116 --> MO113
+
+    %% Pipeline 114: WOV Arbiter & Multi-WOV Host Capture
+    subgraph P114["Pipeline 114 — WOV Arbiter & Multi-WOV Host Capture (Core 0, LL 1ms)"]
+        ARB["wov-arbiter.114.1\n(4-Pin Arbiter · Active Slot Routing)\nPin 0: Audio Drain | Pins 1-3: Trigger Features"]
+        HOST12["host-copier.12.capture\n(PCM 12: 'DMIC Multi-WOV' · hw:0,12)\n1ch · 16 kHz · S16/S32_LE\ncapture_compatible_d0i3: true"]
+        ARB --> HOST12
+    end
+
+    KPB -->|"Pin 1 (2.0s History Pre-roll Drain)"| ARB
+    MWW0 -->|"Pin 1 (Keyword Trigger 0)"| ARB
+    MWW1 -->|"Pin 2 (Keyword Trigger 1)"| ARB
+    MWW2 -->|"Pin 3 (Keyword Trigger 2)"| ARB
+
+    MWW0 -. "Notifier WOV_DETECT (slot=0)" .-> ARB
+    MWW1 -. "Notifier WOV_DETECT (slot=1)" .-> ARB
+    MWW2 -. "Notifier WOV_DETECT (slot=2)" .-> ARB
+    MWW0 -. "Notifier KPB_CLIENT_EVT (DRAIN 2s)" .-> KPB
+    MWW1 -. "Notifier KPB_CLIENT_EVT (DRAIN 2s)" .-> KPB
+    MWW2 -. "Notifier KPB_CLIENT_EVT (DRAIN 2s)" .-> KPB
+    ARB -. "Notifier WOV_CTRL (PAUSE/RESUME)" .-> MWW0
+    ARB -. "Notifier WOV_CTRL (PAUSE/RESUME)" .-> MWW1
+    ARB -. "Notifier WOV_CTRL (PAUSE/RESUME)" .-> MWW2
+
+    style ECNS fill:#1b4f72,stroke:#5dade2,color:#fff
+    style KPB fill:#1c4966,stroke:#5dade2,color:#fff
+    style ARB fill:#4a235a,stroke:#bb8fce,color:#fff
+    style HOST11 fill:#1e8449,stroke:#58d68d,color:#fff
+    style HOST12 fill:#2d5a27,stroke:#58d68d,color:#fff
+```
+
 #### Full System Architecture Graph
 
 ```mermaid