dt-bindings: dsp: fsl,dsp: fix power domain count

Per the current binding, QM/QXP DSPs are supposed to have 4
power domains, while the rest just 1. For QM/QXP, the 4 power
domains are: DSP, DSP_RAM, MU13A, MU13B.

First off, drop MU13A from the count as its already attached
to lsio_mu13. This decreases the count to 3.

Secondly, drop DSP and DSP_RAM from the count for QXP. These
are already attached to the DSP's LPCGs.

Thirdly, a new power domain is required for DSP-SCU communication
(MU2A). With this in mind, the number of required power domains
for QXP is 2 (MU2A, MU13B), while for QM it's 4 (MU13B, DSP,
DSP_RAM, MU2A).

Update the fsl,dsp binding to reflect all of this information.
Since the arm,mhuv2 binding has an example node using the
fsl,imx8qxp-dsp compatible, remove two of the extra PDs to
align with the required power domain count.

Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

Documentation/devicetree/bindings/dsp/fsl,dsp.yaml

@@ -99,14 +99,35 @@ allOf:
           contains:
             enum:
               - fsl,imx8qxp-dsp
-              - fsl,imx8qm-dsp
               - fsl,imx8qxp-hifi4
+    then:
+      properties:
+        power-domains:
+          minItems: 2
+          maxItems: 2
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx8qm-dsp
               - fsl,imx8qm-hifi4
     then:
       properties:
         power-domains:
           minItems: 4
-    else:
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - fsl,imx8mp-dsp
+              - fsl,imx8mp-hifi4
+              - fsl,imx8ulp-dsp
+              - fsl,imx8ulp-hifi4
+    then:
       properties:
         power-domains:
           maxItems: 1
@@ -157,10 +178,8 @@ examples:
                  <&adma_lpcg IMX_ADMA_LPCG_OCRAM_IPG_CLK>,
                  <&adma_lpcg IMX_ADMA_LPCG_DSP_CORE_CLK>;
         clock-names = "ipg", "ocram", "core";
-        power-domains = <&pd IMX_SC_R_MU_13A>,
-                        <&pd IMX_SC_R_MU_13B>,
-                        <&pd IMX_SC_R_DSP>,
-                        <&pd IMX_SC_R_DSP_RAM>;
+        power-domains = <&pd IMX_SC_R_MU_13B>,
+                        <&pd IMX_SC_R_MU_2A>;
         mbox-names = "txdb0", "txdb1", "rxdb0", "rxdb1";
         mboxes = <&lsio_mu13 2 0>, <&lsio_mu13 2 1>, <&lsio_mu13 3 0>, <&lsio_mu13 3 1>;
         memory-region = <&dsp_reserved>;

Documentation/devicetree/bindings/mailbox/arm,mhuv2.yaml

@@ -197,7 +197,7 @@ examples:
             reg = <0 0x596e8000 0 0x88000>;
             clocks = <&adma_lpcg 0>, <&adma_lpcg 1>, <&adma_lpcg 2>;
             clock-names = "ipg", "ocram", "core";
-            power-domains = <&pd 0>, <&pd 1>, <&pd 2>, <&pd 3>;
+            power-domains = <&pd 0>, <&pd 1>;
             mbox-names = "txdb0", "txdb1", "rxdb0", "rxdb1";
             mboxes = <&mhu_tx 2 0>, //data-transfer protocol with 5 windows, mhu-tx
                      <&mhu_tx 3 0>, //data-transfer protocol with 7 windows, mhu-tx