dt-bindings: soc: fsl: cpm_qe: cpm1-scc-qmc: Add support for QMC HDLC

The QMC (QUICC mutichannel controller) is a controller present in some
PowerQUICC SoC such as MPC885.
The QMC HDLC uses the QMC controller to transfer HDLC data.

Additionally, a framer can be connected to the QMC HDLC.
If present, this framer is the interface between the TDM bus used by the
QMC HDLC and the E1/T1 line.
The QMC HDLC can use this framer to get information about the E1/T1 line
and configure the E1/T1 line.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20231011061437.64213-9-herve.codina@bootlin.com
Signed-off-by: Rob Herring <robh@kernel.org>

Author: hcodina

Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,cpm1-scc-qmc.yaml

@@ -101,6 +101,32 @@ patternProperties:
           Channel assigned Rx time-slots within the Rx time-slots routed by the
           TSA to this cell.
 
+      compatible:
+        items:
+          - enum:
+              - fsl,mpc885-scc-qmc-hdlc
+              - fsl,mpc866-scc-qmc-hdlc
+          - const: fsl,cpm1-scc-qmc-hdlc
+          - const: fsl,qmc-hdlc
+
+      fsl,framer:
+        $ref: /schemas/types.yaml#/definitions/phandle
+        description:
+          phandle to the framer node. The framer is in charge of an E1/T1 line
+          interface connected to the TDM bus. It can be used to get the E1/T1 line
+          status such as link up/down.
+
+    allOf:
+      - if:
+          properties:
+            compatible:
+              not:
+                contains:
+                  const: fsl,qmc-hdlc
+        then:
+          properties:
+            fsl,framer: false
+
     required:
       - reg
       - fsl,tx-ts-mask
@@ -155,9 +181,13 @@ examples:
 
         channel@19 {
             /* Ch19 : 8 TS (TS 8..15) from all routed from TSA */
+            compatible = "fsl,mpc885-scc-qmc-hdlc",
+                         "fsl,cpm1-scc-qmc-hdlc",
+                         "fsl,qmc-hdlc";
             reg = <19>;
             fsl,operational-mode = "hdlc";
             fsl,tx-ts-mask = <0x00000000 0x0000ff00>;
             fsl,rx-ts-mask = <0x00000000 0x0000ff00>;
+            fsl,framer = <&framer>;
         };
     };