dt-bindings: remoteproc: imx_rproc: add i.MX8MQ/M support

Add i.MX8MQ/M support, also include mailbox for rpmsg/virtio usage.
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Link: https://lore.kernel.org/r/1615029865-23312-3-git-send-email-peng.fan@oss.nxp.comSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Documentation/devicetree/bindings/remoteproc/fsl,imx-rproc.yaml

@@ -4,7 +4,7 @@
 $id: "http://devicetree.org/schemas/remoteproc/fsl,imx-rproc.yaml#"
 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
 
-title: NXP iMX6SX/iMX7D Co-Processor Bindings
+title: NXP i.MX Co-Processor Bindings
 
 description:
   This binding provides support for ARM Cortex M4 Co-processor found on some NXP iMX SoCs.
@@ -15,6 +15,8 @@ maintainers:
 properties:
   compatible:
     enum:
+      - fsl,imx8mq-cm4
+      - fsl,imx8mm-cm4
       - fsl,imx7d-cm4
       - fsl,imx6sx-cm4
 
@@ -26,6 +28,20 @@ properties:
     description:
       Phandle to syscon block which provide access to System Reset Controller
 
+  mbox-names:
+    items:
+      - const: tx
+      - const: rx
+      - const: rxdb
+
+  mboxes:
+    description:
+      This property is required only if the rpmsg/virtio functionality is used.
+      List of <&phandle type channel> - 1 channel for TX, 1 channel for RX, 1 channel for RXDB.
+      (see mailbox/fsl,mu.yaml)
+    minItems: 1
+    maxItems: 3
+
   memory-region:
     description:
       If present, a phandle for a reserved memory area that used for vdev buffer,
@@ -58,4 +74,17 @@ examples:
       clocks		= <&clks IMX7D_ARM_M4_ROOT_CLK>;
     };
 
+  - |
+    #include <dt-bindings/clock/imx8mm-clock.h>
+
+    imx8mm-cm4 {
+      compatible = "fsl,imx8mm-cm4";
+      clocks = <&clk IMX8MM_CLK_M4_DIV>;
+      mbox-names = "tx", "rx", "rxdb";
+      mboxes = <&mu 0 1
+                &mu 1 1
+                &mu 3 1>;
+      memory-region = <&vdev0buffer>, <&vdev0vring0>, <&vdev0vring1>, <&rsc_table>;
+      syscon = <&src>;
+    };
 ...