dt-bindings: firmware: fsl,scu: Mark multi-channel MU layouts as deprecated

The SCU MU driver has already supported the simple and efficient single-TX
and single-RX channel layout since 2021. The older multi-channel MU
configurations (tx0..tx3 and rx0..rx3) are less efficient in practice and
not needed.

Mark these legacy mbox-names and mboxes tuple layouts as deprecated in the
binding schema. The driver continues to support them for backward
compatibility in case firmware publishes the legacy properties.

The example section is updated accordingly to demonstrate the recommended
layout.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20260127-scu-v2-1-03f3aaa56e1b@nxp.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

diff --git a/Documentation/devicetree/bindings/firmware/fsl,scu.yaml b/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
index f9ba18f06369215691c69cdc1538b53dfd369f37..307f1c6278532ace94db92e6e8b68312eb4c8a4f 100644 (file)
--- a/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
+++ b/Documentation/devicetree/bindings/firmware/fsl,scu.yaml
@@ -76,7 +76,8 @@ properties:
           - description: TX0 MU channel
           - description: RX0 MU channel
           - description: optional MU channel for general interrupt
-      - items:
+      - deprecated: true
+        items:
           - description: TX0 MU channel
           - description: TX1 MU channel
           - description: TX2 MU channel
@@ -85,7 +86,8 @@ properties:
           - description: RX1 MU channel
           - description: RX2 MU channel
           - description: RX3 MU channel
-      - items:
+      - deprecated: true
+        items:
           - description: TX0 MU channel
           - description: TX1 MU channel
           - description: TX2 MU channel
@@ -105,7 +107,8 @@ properties:
           - const: tx0
           - const: rx0
           - const: gip3
-      - items:
+      - deprecated: true
+        items:
           - const: tx0
           - const: tx1
           - const: tx2
@@ -114,7 +117,8 @@ properties:
           - const: rx1
           - const: rx2
           - const: rx3
-      - items:
+      - deprecated: true
+        items:
           - const: tx0
           - const: tx1
           - const: tx2
@@ -167,11 +171,9 @@ examples:
     firmware {
         system-controller {
             compatible = "fsl,imx-scu";
-            mbox-names = "tx0", "tx1", "tx2", "tx3",
-                         "rx0", "rx1", "rx2", "rx3",
-                         "gip3";
-            mboxes = <&lsio_mu1 0 0 &lsio_mu1 0 1 &lsio_mu1 0 2 &lsio_mu1 0 3
-                      &lsio_mu1 1 0 &lsio_mu1 1 1 &lsio_mu1 1 2 &lsio_mu1 1 3
+            mbox-names = "tx0", "rx0", "gip3";
+            mboxes = <&lsio_mu1 0 0
+                      &lsio_mu1 1 0
                       &lsio_mu1 3 3>;
 
             clock-controller {